PDF User Manual

  1. Home
  2. Manuals
  3. a/d/s/ PH30.2 Owner's Manual

a/d/s/ PH30.2 Owner's Manual

Made by: a/d/s/
Type: Owner's Manual
Category: Car Amplifier
Pages: 24
Size: 1.7 MB

 

Download PDF User Manual



Full Text Searchable PDF User Manual



background image

analog and digital systems

PH30.2

owner's manual

front_cover.qxd  10/26/56  5:13 AM  Page 2

 


background image

table of contents

introduction

1

about this manual

2

features of your PowerPlate™

2

warning and tips

3

mounting locations

3

system planning

4

system configurations

5-9

amplifier and crossover controls

10-11

installation

12

controls and connections

12-13

signal sources

14

internal signal routing

15

multi-cross™ crossover and configurations

16

constant bass control

17

AC502 operation

17

tuning

17-18

troubleshooting 

19-20

specifications

21

warranty information

22

introduction

Although it may be hard to remember, back in the 1970’s, car audio as we now know it didn’t really exist.
Sure, music lovers could buy a cassette or 8-track tape deck and some 6" x 9" three-way speakers.
Advanced stereo buffs might even add a "power-booster" to increase output too as much as 12 watts
RMS! But none of this really delivered the power to cut through road noise with sound quality that
compared with the best home audio. Not until 1979 that is, when a/d/s/ introduced the revolutionary
PowerPlate™  P100 amplifier and 300i 2-way plate loudspeakers. Aesthetically, the P100 introduced the
low profile design which has been an a/d/s/ trademark to this day. Technologically, the P100 combined a
high efficiency switching power supply with a state-of-the-art, discrete high-current stereo power
amplifier. For the first time, a car audio system existed with the musical integrity and dynamic range that
made you want to take long drives to nowhere, just to listen to the music. High quality car audio was
born, and the original a/d/s/ PowerPlate™  P100 made it happen.

The latest improvements to the PowerPlate™ line-up include increased heatsink area to facilitate higher
power output, Constant Bass circuit for subwoofer signal that can be mixed into all channels, and fully
balanced high-level inputs compatible with any source. The amplifier you have purchased is an
enhancement of the respected P-series multichannel amplifiers. In this version, we have improved upon
the already acclaimed sound quality by addressing internal details, and upgrading selected components
to incorporate the latest technology which was not available when the P-series was originally designed.
Selected low-noise, high-speed Burr-Brown® op amps are used in critical circuits. Class-A biasing is used
throughout the voltage-gain and active crossover stages. Numerous modifications and "tweaks" were
also performed which improve the power supply dynamics and reduce noise. These changes improve
transparency and dynamic linearity, resulting in a smoother and more detailed top-end, tighter bass, more
explosive dynamic contrasts, and virtually holographic imaging. Left intact are the P-series unequalled
flexibility, high efficiency and superb reliability. These, along with multichannel design, are fundamental in
the a/d/s/ approach to systems engineering, which makes achieving true high fidelity reproduction simple
and predictable in any installation.

1

 


background image

about this manual

To get the most from your a/d/s/ PowerPlate™, we recommend that you have the installation performed
by your qualified authorized a/d/s/ dealer. If this unit is installed by your dealer, we will extend the warranty
to two years instead of the standard one-year. However, if you feel that you have the necessary skills and
prefer to perform the installation yourself, this manual will guide you through the process of installation
and set-up. Please read through it completely before beginning the installation so that you may familiarize
yourself with the total procedure before you begin. If there is anything that you do not fully understand,
please consult with your a/d/s/ dealer before attempting the installation.

keep listening, but be safe!

Sustained listening to loud music over 100dB has been shown to cause permanent hearing damage.
Systems using a/d/s/ components are capable of achieving volume levels, which substantially exceed this
level. When operating your system for sustained periods at high volume, be sure to use hearing protection
to prevent long-term exposure. We want you to be able to enjoy the music for many more years. 

features of your PowerPlate™

Transient Perfect™ MOSFET Power Supply -

The heart of the P-series, this supply frees the

PowerPlate™  from the constraints of common pwm (pulse width modulated) supplies. The advantages
are: extremely fast overload recovery time, low output impedance for superior damping, and stability
during voltage fluctuations for reliable performance in the harsh automotive environment.

Remote Subwoofer or Constant Bass Level Control Capability -

Can be used with accessory control

AC502 to provide a dashboard mounted rear channel subwoofer or Constant Bass level control.

Digital Crossover Frequency Display -

The crossover frequency for each channel pair is displayed on

the top of the amplifier for quicker, more precise system tuning.

Detachable Plug in Connectors -

High current speaker and power connectors simplifies installation.

Multi-cross™ Variable Built-in Crossovers -

High-pass, Low-pass and Bandpass functions are built-in,

virtually eliminating the need for external crossover networks in even the most elaborate systems.

Constant Bass circuit -

Signal from all input channels is summed, low-pass filtered and then made

available to all channels.

PowerPlate™ Design -

a/d/s/ original low profile, high efficiency heatsink design keeps size minimum

and allows mounting where space is limited.

Wide Input Sensitivity Range -

Allows connection to virtually any source unit from factory OEM radios

through low output preamps.

Simultaneous Stereo and Mono -

Each channel pair may be used Stereo, Mono, Bridged or both Stereo

and Mono simultaneously. This allows an additional Mono speaker to be used with a stereo pair for
center-channel or subwoofer applications from each channel pair.

Same Side Adjustments -

The P-series PowerPlate™ makes system adjustment easy by organizing all

signal-processing controls on one side of the amplifier. This layout allows convenient system adjustment
and facilitates a variety of installation possibilities when access to the controls is desired.

2

 


background image

warnings and tips

Always disconnect the battery ground wire before doing any work on your vehicle. Reconnect the cable
only after the installation is complete and the wiring has been checked to make sure that there are no
problems. If your radio features a code type security system, be sure you know the code before
disconnecting the battery!
Your a/d/s/ PowerPlate™ should be installed in 12V negative ground vehicles only. Connection to other
types of electrical systems may cause damage to the vehicle or the amplifier. Wear Eye and Ear protection
when using power tools.
Before cutting or drilling carefully inspect the area to make sure there are no electrical wiring, fuel lines
or brake lines that could be damaged. Sometimes these components may be hidden between double-
walled panels, so be very careful.
Do not bypass or modify the fuses, or replace with one of a higher rating. The fuse should not fail under
normal operation. Repeated blowing indicates a problem with the amplifier or improper installation. An
additional power supply line fuse (not supplied) must be installed on the 12V supply line and located as
close as possible to the battery in order to protect the wire in the event of a short circuit.
Make sure the system is turned off when making or breaking any connections. Do not use your PowerPlate™
with speakers which have either terminal connected to the speaker frame or to the vehicle chassis.

mounting locations

Due to its low profile, there are many possible choices of mounting locations.  Always mount the
PowerPlate™ in a place that protects it from the elements. In addition, mount the PowerPlate™ on a
stable, flat mounting surface. Whenever possible, pre-drill the mounting holes. Remember to check
behind the panel for hidden dangers in the form of hoses, fuel or brake lines or electrical wiring. Use a
marking pen or awl to mark the hole locations and pre-drill using a 1/8" bit.

Passenger compartment mounting 

All PowerPlates™ have been designed with a low profile to make under
seat mounting possible. Regardless of where you choose to mount your
PowerPlate™ be sure to keep a minimum of 1" of clearance around the
amplifier for adequate airflow to prevent overheating.

Trunk compartment mounting 

The most common mounting location is in the trunk or cargo
compartment. For optimum cooling, mount the PowerPlate™ chassis
vertically with the fins running vertically, or mount the PowerPlate™
horizontally with the fins pointing upward. Avoid horizontal mounting
locations with the fins pointing downward.
Also, locate the PowerPlate™ where it, and connections to it, will not be
damaged by cargo or tools, which may shift during vehicle operation.

Engine compartment mounting 

Don’t even think about it! The PowerPlate™ was not designed to endure
the harsh chemical and heat environment of the engine compartment.
Failure to obey this warning will void your warranty.

3

 


background image

system planning

Proper system planning is the best way to maximize your PowerPlate’s™  performance. By planning your
installation carefully you can avoid situations where the performance or the reliability of your system is
compromised. Your authorized a/d/s/ dealer has been trained to maximize your system’s sonic potential.
Your a/d/s/ dealer is a valuable resource in helping you with your system design and installation.

speaker requirements

Each channel of your PowerPlate™ can
easily drive 2  speaker loads when used in
the stereo mode. When a channel-pair is
bridged, the recommended minimum load
impedance is 4  for subwoofer use, and 4
for full range operation. Although operation
with lower impedances is not likely to cause
immediate damage to the internal circuitry,
the unit will most likely overheat, causing the
thermal protection circuitry to shut down the
amplifier. When the chassis cools  down,
normal operation will resume. Continuing to
operate the amplifier under these conditions
is not recommended and will reduce its life
expectancy.

Most speakers designed for car audio
operation are 4  impedance. Connecting
two such speakers in parallel will result in a
2  impedance load as seen by the amplifier.
Some a/d/s/ subwoofer models feature a
dual 4  voice coil design. Connecting these
voice coils in parallel will result in a 2
nominal impedance, which is not
recommended for use with bridged channels
of your PowerPlate™.

4

 


background image

system configurations

All a/d/s/ PowerPlates™ provide extensive features, which make a variety of system configurations
possible. It is not feasible to cover all of the possibilities within the few pages of this manual. There are a
few system configurations, however, which are extremely popular when used alone or as a "building
block" of a larger more elaborate system. Please review systems 1 through 6 described below for
suggestions on how to configure the most popular combinations. Larger systems may be built from a
combination of the simpler building blocks as shown in systems 7.

button is disengaged

control is non-operational

button is engaged

control is operational

System 1 -

PH30.2  used in 6-channel mode.  Channels 1 and 2 are used for front high-pass speakers,

channels 3 and 4 are used for rear high-pass speakers and channels 5 and 6 are used to drive a stereo
pair of subwoofers. Although shown as a 4-channel input, the source unit can be either 2 or 4 channel
depending on the setting of the 2/4 channel switch.

Note: Optional AC502 can be used in this system to adjust the level of the subwoofers. 

5

front left 
satellite

subwoofer

subwoofer

rear left
satellite

rear right
satellite

front right
satellite

70A

 


background image

System 2 -

PH30.2 used in 5-channel mode with the AC502 providing level control for bridged channels

5 and 6. 1 and 2 are high-passed for front speaker and channels 3 and 4  are high-passed for rear
speakers. Although shown as a 4-channel input, the source unit can be either 2 or 4-channel depending
on the setting of the 2/4 channel switch.

System 3 -

PH30.2 used in 6-channel mode with source unit providing direct level control for channels 5

and 6 through the fade control. Channels 1 and 2 are configured high-pass for tweeters, channels 3 and
4 are configured bandpass for midrange and channels 5 and 6 are configured low-pass for subwoofers. 

6

front left
satellite

front right
satellite

rear left
satellite

rear right
satellite

subwoofer

70A

left tweeter

right tweeter

left midrange

right midrange

subwoofer

subwoofer

70A

 


background image

System 4 -

PH30.2 used in 4-channel mode with high-pass tweeters and bandpass midrange. Channels

1and 2 are configured high-pass for the main tweeters and channels 3 and 4, and 5 and 6 are configured
bandpass for main midrange. Channels 4 and 6 are controlled by the 3/4 level control and crossover
section. The amplifier is configured for a 2-channel input.

System 5 -

PH30.2 used in 4-channel mode with high-pass main speakers and low-pass

subwoofers.Channels 1 and 2 are configured high-pass for front speakers and channels 3/4, and 5/6 are
configured low-pass for bridged output subwoofers. The amplifier is configured for a 4-channel input.
Front/rear fade adjusts subwoofer level.

7

left tweeter

right tweeter

right midrange 

left midrange 

70A

left satellite

right satellite

subwoofer

subwoofer

70A

 


background image

System 6 -

PH30.2 used in 3-channel bridged mode with two channels dedicated for the main speakers

and one bridged channel pair used for a subwoofer. Channels 1/2, and 3/4 are configured high-pass for
the main front speakers using a single pair of RCA inputs to produce a bridged mono output.

8

left 
satellite

right 
satellite

subwoofer

70A

 


background image

System 7 -

Two PH30.2’s are used. The first PH30.2 is configured the same as system 4 and the second

PH30.2 is configured similar to system 5. The first amplifier drives the front midrange and tweeters and
the second amplifier drives the rear speakers and the subwoofer.

9

front right
tweeter

front left
midrange

front right
midrange

front left
tweeter

front

rear

rear left
satellite

rear right
satellite

subwoofer

subwoofer

70A

70A

 


background image

10

 


background image

1.

2ch/4ch input switch-  Leave this switch OUT if you ar

e using 4 channels of input. Push the switch IN if you have only 2 chan

nels of input to 

send  input 1 and 2 to channels 3 and 4, r

espectively

. (see page 15)

2.  

5/6 sour

ce- This switch selects the sour

ce for channel 5 and 6.  Select the input sour

ce as input RCA 1 and 2, the summed s

ignals fr

om RCA inputs 1and

3 and 2 and 4, or as RCA inputs 5 and 6.

3.  

level contr

ols-  Use these contr

ols to match the input level fr

om the sour

ce unit to each pair of amplifier channels. (see 

page 15)

4.  

cr

ossover 1/2 switch-  this switch will tur

n the channel 1/2 cr

ossover on or of

f, or send channel 3 and 4 signal to channel

s 1 and 2, r

espectively

(see page16)

5.  

cr

ossover 1/2 fr

equency-  This contr

ol sets the highpass cr

ossover point for channels 1 and 2.  (see page 16)

6.  

cr

ossover 3/4 highpass switch-  Push this switch IN to activate the channel 3/4 highpass cr

ossover

, or OUT to bypass the cr

ossover

(see page 16)

7.  

cr

ossover 3/4 highpass fr

equency-  This contr

ol sets the highpass cr

ossover point for channels 3 and 4. (see page 16)

8.  

cr

ossover 3/4 lowpass switch-   Push this switch IN to activate the channel 3/4 lowpass cr

ossover

, or OUT to bypass the cr

o

ssover

(see page 16)

9.  

cr

ossover 3/4 lowpass fr

equency-  This contr

ol sets the lowpass cr

ossover point for channels 3 and 4. (see page 16)

10.  

cr

ossover 5/6 switch - This switch will tur

n the channel 5/6 cr

ossover on or of

f, or send channel 3and 4 signal to channels 5and 

6, r

espectively (see page 16)

11. 

cr

ossover 5/6 fr

equency this contr

ol sets the lowpass cr

ossover point for channels 5 and 6 (see page 16)

12. 

output switches-  These switches determine whether the output is mono, bridged or ster

eo configuration for channels 1/2 and

 3/4. 

(see page 15)

13. 

Constant Bass level-  Use these contr

ols to mix summed mono sub-bass information into channels 1/2 and 3/4. (see page 17) 

14. 

Constant Bass fr

equency-  This contr

ol sets the lowpass cr

ossover point of the Constant Bass signal. (see page 17)

15. 

AC502 contr

ol-  When using an optional AC502 r

emote level contr

ol, the AC502 will contr

ol the constant bass level when the 

switch is IN, or  channel3/4

level when the switch is OUT

. (see page 17)

amplifier and cr

ossover contr

ols 

11

 


background image

installation

1.

Disconnect the battery ground cable. Reconnect the ground cable only after the installation is 
complete and the wiring has been checked to make sure that there are no problems. If your 
radio features a code type security system, be sure you know the code before disconnecting 
the battery!

2.

Run a minimum AWG #8 power wire directly from the battery to the PowerPlate™ mounting
location. Install a fuseholder at the battery end of this cable either within 18" of the battery 
or before the wire runs through any metal partitions. Do not install the fuse at this time.

3.

Attach a minimum AWG #8 ground wire to a solid chassis ground point near the mounting 
location.  Keep this wire as short as possible. Scrape all paint and primer off of the sheet 
metal at the ground point to ensure a good electrical connection. Attach the wire to the 
ground point with a nut, bolt and star washer.

4.

Run the signal leads and remote turn-on leads from the head unit to the PowerPlate™ 
location. If using an  internally powered radio or factory radio refer to the "signal sources" 
section for the proper wiring connections.

5.

Install the speakers and run each of the speaker leads to the PowerPlate™ location. Connect 
the speaker, remote, and power wires to the appropriate terminals on the plug-in terminal 
blocks. Refer to the "controls and connections" or "system planning" sections for 
information on the proper connections. The speaker terminal blocks install with the set 
screws facing up and power terminal block installs with the set screws facing down. 

6.

Preset the 2/4 channel selector switch, crossover and channel mode switches, and crossover 
frequency switches to the desired positions. Refer to the "controls and connections" section 
for more information.

7.

Adjust all amplifier input level controls to the 1/4 position.

8.

Mount the amplifier into position and plug in the power and speaker terminals. Attach the 
input signal cables.

9.

Reattach the battery ground cable.

10.

Double check your switch and control settings. Install a 70 amp fuse in the fuseholder you 
have installed near the battery.

11.

Turn on the signal source at a low volume level. Using the balance and fader controls, check to 
see that each channel is connected to the proper speakers. Make sure that the proper 
frequency range is being sent to each speaker if you are using the crossover features built 
into your PowerPlate™.

12.

Adjust the input sensitivity and crossover frequencies as described in the "tuning" section.

13.

Read the rest of this manual to get maximum enjoyment from your system.

controls and connections

power connections

Use AWG #8 or larger power and ground cable.

Install 70 amp fuse in the power wire within 18" of the battery.

Keep the ground wire to a minimum length and attach solidly to a clean metal part of the 
vehicle. The addition of a .5 Farad to 1 Farad power supply capacitor, mounted as close as 
possible to the PowerPlate™, may improve performance in some systems.

12

 


background image

speaker connections for stereo configurations

Minimum recommended impedance is 2  stereo. Speaker terminals accept up to AWG #12 speaker wire.

speaker connections for bridged configurations 

Minimum recommended impedance is 4  when bridged to subwoofers and 4  when bridged to full range
speakers. Speaker terminals accept up to AWG #12 speaker wire.

13

Connect to 12V turn-on
lead from source unit

Connect to chassis of vehicle

Connect to
chassis of vehicle

70 Amp fuse

less than

18" from

battery

Factory chassis ground

fuse

70A

70A

70A

 


background image

signal sources

Due to the wide input level adjustment range, all a/d/s/ PowerPlates™ can be driven with either a
conventional preamplifier drive signal or the amplifier signal from a powered source unit. This makes the
PowerPlate™ perfect for upgrading an OEM (Original Equipment Manufacturer) stereo system while
retaining the factory installed radio.

Because of the high impedance of the a/d/s/ input stage, the factory radio drives an easy load. This ensures
lower distortion levels than if it was driving speakers or a Line Output Converter accessory. As a result, a
high quality factory installed radio can deliver high quality sound that is nearly as good as the sound from
a high-end aftermarket source unit. The speaker outputs of the factory radio are simply connected to a
mini-DIN adapter as shown below. From this point on, the signal can be treated exactly as you would a
preamp-level signal, except that the input level controls on the PowerPlate™ will be set to a lower than
usual level when you make your final adjustments.

Conventional aftermarket sources may be connected using standard shielded RCA cables from the source
unit’s preamp outputs to the PowerPlate™ inputs.

Note: When using 4 channels of input, be sure to configure the 2ch/4 ch input switch to 4ch
input. Failure to do so may result in damage to the source unit.

Pin 

Wire Color 

Connects to Head Unit

gray  

front right +     

violet/black 

rear right -     

white  

front left +     

gray/black  

front right -     

white/black 

front left -      

green  

rear left +      

green/black

rear left -     

violet  

rear right +

14

70A

 


background image

internal signal routing

2-channel/4-channel input switch -

routes RCA input from channels 1/2 to channels 3/4. 

When the switch is engaged, channel 1 input is
routed to both amplifier channels 1 and 3 with input
channel 2 routed to amplifier channels 2 and 4.

Switch in the engaged position.

When the switch is disengaged, channels 1, 2, 3,
and 4 receive signal individually from their
respective inputs.

Switch in the disengaged position.

Level controls -

Independent level controls for channels 1/2, 3/4 and 5/6 adjust

the input sensitivity from 100 mV to 8 VRMS.

Output - 

Three position switches determine the output configuration. Each stereo pair of channels can

be configured in either stereo, summed-bridged and bridged-mono.

When the switch is in the left position, the output channels are configured for
stereo operation.

When the switch is in the center position, the output channels are configured
for summed bridged operation by mixing the left and right input signals
together.

When the switch is in the right position, the output channels are configured
for a bridged mono output using a single RCA input. Ch 1 input is used for
channels 1 & 2, ch 4 input is used for channels 3 & 4 and Ch 5 is used for
channels 5 & 6.

15

 


background image

multi-cross™ crossover configuration

xover control 1/2- 

The crossover selection for channels 1 & 2 has three options:

When the switch is in the left position, the crossover section of the amplifier is
bypassed. Channels 1 & 2 output is full range.

When the switch is in the center position, channels 1 & 2 are filtered through a 12dB
per octave high-pass crossover that is infinitely variable from 45Hz to 5,000Hz.

When the switch is in the right position, channels 1 & 2 receive signal from the
crossover output of channels 3 & 4. 

Note: When crossover 3/4 output is selected for channels 1/2, the 3/4 level
control adjusts the output level for channels 1/2 and 3/4 simultaneously.

xover control 3/4-

The crossover sections dedicated for channels 3 & 4 are activated by depressing the

switch next to each frequency adjustment control. Both high-pass and low-pass crossovers are infinitely
adjustable from 45Hz to 5,000Hz. The high-pass and low-pass sections may be used individually or
together to create a bandpass filter.

Note: When using both sections to create a bandpass filter, make
sure you have selected a low-pass frequency that is higher than the
high-pass frequency!

xover control 5/6-

The crossover selection for channels 5 & 6 has three options:

When the switch is in the left position, the crossover section of the amplifier is bypassed.
Channels 5 & 6 output is full range.

When the switch is in the center position, channels 5 & 6 are filtered through a 12dB
per octave low-pass crossover that is infinitely variable from 45Hz to 5,000Hz.

When the switch is in the right position, channels 5 & 6 receive signal from the crossover
output of channels 3 & 4. 

Note: When crossover 3/4 output is selected for channels 5/6, the 3/4 level
control adjusts the output level for channels 3/4 and 5/6 simultaneously.

digital crossover frequency display  

To facilitate quicker system tuning, we have incorporated
a digital display that shows the crossover frequency for
each crossover section, including the lowpass crossover
for the constant bass circuit.  Push the select switch to
scroll through the different sections, and a blue led will
indicate which crossover is currently displayed.

16

ch 1/2 high pass

ch 3/4 high pass

ch 3/4 low pass

ch 5/6 low pass

select

constant bass

 


background image

Constant Bass circuit

To mix sub-bass information into channels 1/2 and 3/4, select a low-
pass crossover point, and use the level controls to set the level of sub-
bass signal sent to channels 1/2 and 3/4.

using the AC502 (optional)

The AC502 remote level control, available as an accessory from your a/d/s/ dealer, may be used with your
PowerPlate™ to remotely adjust the level of channels 5/6, OR to remotely adjust the constant bass level.
To use this feature, simply connect the AC502 into the DIN connector on the PH30.2, and install the
AC502 in the desired location. To adjust the constant bass level, Locate the AC502 control switch on
amplifier and push IN, or leave it OUT to control the level of channels 5/6. This remote capability can also
be used on channels 1/2 and 3/4 when the PH30.2 is used in the 2-channel bridged mode. Refer to the
"adjustments" section for information on setting up the AC502.

tuning

tuning the crossover

All of the crossover controls in the multi-cross™ crossover section are marked at four
reference frequency points. These are 45Hz, 175Hz, 600Hz and 5,000Hz. Specific crossover
points should be chosen based on the operating range recommended by the manufacturer
of your speakers.  The 85Hz position is a good starting point to use for subwoofer low-pass
or midrange high-pass use. When bi-amping a/d/s/ loudspeaker components 2500Hz is a
good starting point for the midrange low-pass, and 3500Hz is recommended as the tweeter high-pass.
Once installed, you can fine tune the crossover points using your ears or with the aid of an RTA to achieve
maximum performance. With any loudspeaker, minor deviations from the recommended frequency
ranges may provide superior results, depending on your speaker locations and your vehicle’s acoustics.
Setting crossover frequencies higher than recommended will not cause damage and may provide good
results. However, DO NOT set high-pass tweeter crossover points below the tweeters recommended
operating range. Doing so will likely cause damage not covered by the manufacturer’s warranty. If you are
using non-a/d/s/ speakers, refer to the manufacturer’s recommendation for selecting the proper crossover
frequencies.

17

70A

 


background image

adjusting input sensitivity

The input sensitivity setting is important to ensure proper performance, low noise levels, and maximum
system reliability. As a general rule, components at the "front end" of the system should be set as high
as possible with the input sensitivity of the amplifier set as low as possible while still providing adequate
volume levels. Using a high signal level from the source and a low input sensitivity setting on the amplifier
will keep the background noise levels of the system low. 
The following procedure will help you get the widest dynamic range from your system:

1.

Start with the input level controls of your PowerPlate™ at the minimum (counterclockwise) 
position.

2.

Set the tone controls and any controls on any equalizers or other signal processors to their flat
or bypassed positions.

3.

Set the input and output level controls, if any, on any associated equipment such as equalizers
or outboard electronic crossover as recommended by their manufacturers.

4.

Select a well recorded CD or Tape containing material recorded at a fairly high level. Musical 
content is not important except that the music chosen should be recorded such that any system
distortion can be clearly heard, not masked by musical content.

5.

Increase the source unit volume control about halfway. Increase the PowerPlate™ level control
associated with the front full range (or midrange in a bi-amplified front system) until you can 
hear sound at a low but clear level.

6.

While listening carefully for any signs of distortion, slowly increase the source unit volume 
control until you either hear the first signs of distortion or you can’t turn it up any more. Back
down on the volume control slightly until the distortion goes away. You have just found the 
maximum undistorted output level of your source unit. Do not exceed the level in normal 
operation, as doing so will just send a distorted signal to the rest of the system.

7.

Returning to the PowerPlate™ level control associated with the front main speakers, slowly 
increase it until you reach the point where distortion just begins to appear. This will be at the 
point where either the amplifier reaches its maximum output level, or the speakers reach their
output limits. Either way, you have just calibrated the system so that the maximum system 
output occurs at the same point as the maximum output from the source. This will give you 
minimum system noise yet the system will reach its maximum output capability.

8.

Reduce the source unit volume to a comfortable listening level. With the balance and fader 
controls still centered, adjust the remaining level controls for the proper system  balance.  If you
are adjusting a system with multiple amplifiers, it is easiest to adjust the controls in the 
following order: 1. Front speakers 2. Rear speakers 3. Subwoofers

9.

If using an AC502 remote level control, adjust the subwoofer level with the AC502 in the mid
position. This will give you the ability to boost the subwoofer level approximately 6dB when 
the AC502 is turned fully clockwise.

10.

Double check your system levels by increasing the source unit volume control to the previously
determined maximum position. If you hear distortion from any of the channels, reduce the 
PowerPlate™ input level for those channels until the distortion goes away.

Adjusting the input levels in this way will get maximum undistorted output from your system and will
make it unlikely that you will cause damage to any of the components of your system by overpowering
them.

18

 


background image

troubleshooting

symptom

possible cause

action to take

no output

low or no remote turn-on

check remote turn-on voltage 

input     

output at amplifier and correct
as needed

fuse blown

check power wire integrity 
and reversed polarity, repair
as needed and replace fuse

power wires not connected

check power wire and ground
connections and repair or 
replace as needed

audio input not connected 

check input connections and 

or no output from source

signal integrity, repair or 
replace as needed

speaker wires not connected

check speaker wires and repair
or replace as needed

audio cycles on and off

speakers are blown

check system with known
working speaker and repair or 
replace speakers as needed

thermal protection engages

make sure there is proper

when amplifier heatsink

ventilation for amplifier and 

temperature exceeds 90° C

improve ventilation as needed

loose or poor audio input

check input connections and
repair or replace as needed

distorted output

amplifier level sensitivity set too     

reset gain referring to the 

high; exceeding maximum 

tuning section of the manual 

output capability of amplifier

for detailed instructions

impedance load to amplifier too    

check speaker impedance load

low

if below 2  stereo or 4
mono rewire speakers to 
achieve a higher impedance

shorted speaker wires

check speaker wire 
connections and repair or 
replace as needed

speaker not connected to

check speaker wiring and 

amplifier properly

repair or replace as needed
refer to the installation  section
of this manual for detailed 
instructions

internal crossover not set

reset crossovers referring to the

properly for speaker

multi-cross™ crossover 
configuration section of this
manual

19

 


background image

symptom

possible cause

action to take

distorted output (cont’d)

speakers are blown

check system with known 
working speakers and repair or
replace as needed 

poor bass response

speakers wired with wrong

check speaker polarity and 

polarity causing cancellation

repair as needed

at low frequencies

crossover set incorrectly

reset crossovers referring to
the multi-cross™ crossover 
configuration section of this 
manual for detailed instructions

battery fuse blowing

impedance load to amplifier

check speaker impedance load,

too low

if below 2  stereo or 4  mono
rewire speakers to achieve a 
higher impedance

short in power wire or incorrect

check power and ground 

power connections

connections and repair as
needed

fuse used is smaller than

replace with proper fuse size

recommended

too much current being drawn

check speaker impedance load,
if below 2  stereo or 4  mono 
rewire speakers to achieve a
higher impedance 

short in power wire or incorrect

check power and ground 
connections and repair as
needed

amplifier fuse blowing

too much current being drawn

check speaker impedance load,
if below 2  stereo or 4  mono
rewire speakers to achieve a 
higher impedance and replace
with recommended fuse size

check power and ground 
connections and repair as
needed

fuse used is smaller than

replace with proper fuse size

recommended

20

 


background image

specifications

amplifier section

PH 30.2

power output 4  (watts)1 

6 channel 6 x 75
3 channel 3 x 250

power output 2  (watts)2 

6 x 112.5

fuse type

70 A maxi

dimensions

13" x 19 7/8" x 2"

distortion all channels driven 

<0.1% 20Hz to 20,000Hz

frequency response 

±1dB 10Hz to 30,000Hz

signal-to-noise ratio full 

>90dB

bandwidth @ rated output power 

damping factor @ output 

>150

connector full bandwidth

input sensitivity 

100mV to 8Vrms for full output

input impedance 

47 k

crossover section 

ch 1 & 2

high-pass 12dB/octave variable 45Hz- 5kHz 

h 3 & 4 

high-pass & low-pass 12 dB octave variable 45Hz- 5kHz 

ch 5 & 6 

low-pass 12 dB / octave variable 45Hz- 5kHz 

Constant Bass 

low-pass 12dB/octave variable 30Hz- 300Hz

1 All channels driven, continuous FTC rated 4  load, 20Hz to 20,000Hz, <0.1% THD, power input

voltage at 13.8DVC.

2 All channels driven, continuous FTC rated 2  load, 20Hz to 20,000Hz, <0.1% THD, power input

voltage at 13.8DVC.

3 All channels are selectable with infinitely variable adjustments from 45Hz to 5,000Hz with a slope

of 12dB/octave and a "Q" of .707.

21

 


background image

warranty information

LIMITED TWO YEAR CONSUMER WARRANTY

Directed Electronics, Inc. promises to the original purchaser, to replace this product should it prove to be
defective in workmanship or material under normal use, for a period of two years from the date of
purchase by the dealer as indicated by the date code marking of the product 

PROVIDED

the product was

installed by an authorized Directed dealer. During this two year period, there will be no charge for this
replacement 

PROVIDED

the unit is returned to Directed, shipping pre-paid.  If the unit is installed by

anyone other than an authorized Directed dealer, the warranty period will be 1 year from date of purchase
by the dealer as indicated by the date code marking of the product. During this 1 year period, there will
be no charge for this replacement 

PROVIDED

the unit is returned to Directed, shipping pre-paid. This

warranty is non-transferable and does not apply to any unit that has been modified or used in a manner
contrary to its intended purpose, and does not cover damage to the unit caused by installation or removal
of the unit. This warranty is void if the product has been damaged by accident or unreasonable use,
neglect, improper service or other causes not arising out of defects in materials or construction. 

ALL

WARRANTIES INCLUDING BUT NOT LIMITED TO EXPRESS WARRANTY, IMPLIED WARRANTY,
WARRANTY OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, AND WARRANTY OF
NON-INFRINGEMENT OF INTELLECTUAL PROPERTY ARE EXPRESSLY EXCLUDED TO THE
MAXIMUM EXTENT ALLOWED BY LAW, AND DIRECTED NEITHER ASSUMES NOR AUTHORIZES
ANY PERSON TO ASSUME FOR IT ANY LIABILITY IN CONNECTION WITH THE SALE OF THE
PRODUCT. DIRECTED HAS ABSOLUTELY NO LIABILITY FOR ANY AND ALL ACTS OF THIRD PARTIES
INCLUDING ITS AUTHORIZED DEALERS OR INSTALLERS.

Unit must be returned to Directed, postage

pre-paid, with: consumer's name, telephone number, and address, authorized dealer's name and address,
and product description. 

IN ORDER FOR THIS WARRANTY TO BE VALID, YOUR UNIT MUST BE

SHIPPED WITH PROOF OF INSTALLATION BY AN AUTHORIZED DIRECTED DEALER. ALL UNITS
RECEIVED BY DIRECTED FOR WARRANTY REPAIR WITHOUT PROOF OF DIRECTED DEALER
INSTALLATION WILL BE COVERED BY THE LIMITED 1 YEAR PARTS AND LABOR WARRANTY. 

Note:

This warranty does not cover labor costs for the removal and reinstallation of the unit.

BY PURCHASING THIS PRODUCT, THE CONSUMER AGREES AND CONSENTS THAT ALL DISPUTES
BETWEEN THE CONSUMER AND DIRECTED SHALL BE RESOLVED IN ACCORDANCE WITH
CALIFORNIA LAWS IN SAN DIEGO COUNTY, CALIFORNIA.

22

 


background image

a

Directed Electronics, Inc.  All rights reserved  G49200  09-02

front_cover.qxd  10/26/56  5:13 AM  Page 1