Full Text Searchable PDF User Manual
VTX SERIES
POWER AMPLIFIERS
VTX 4120, VTX 4240, VTX 4400
PEAK
SIGNAL
POWER
1
2
3
4
PROTECT
CHANNEL
VTX 4120
4x 120W Amplifier
PEAK
SIGNAL
POWER
1
2
3
4
PROTECT
CHANNEL
VTX 4240
4x 240W Amplifier
PEAK
SIGNAL
POWER
1
2
3
4
PROTECT
CHANNEL
VTX 4400
4x 400W Amplifier
O
I
O
I
O
I
Installation and User Guide
VTX Series User Manual v1.0
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1. Read these Instructions.
2. Keep these Instructions.
3. Heed all Warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in
accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators,
heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or
grounding - type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug
has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety.
When the provided plug does not fit into your outlet,
consult an electrician for replacement of the obsolete
outlet.
10. Protect the power cord from being walked on or
pinched particularly at plugs, convenience receptacles,
and the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the
manufacturer.
12. Use only with a cart, stand, tripod, bracket, or
table specified by the manufacturer, or sold with
the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to
avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when
unused for long periods of time.
14. Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power-supply cord or plug
is damaged, liquid has been spilled or objects have fallen
into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has
been dropped.
Do not expose the apparatus to dripping or splashing,
and ensure that no objects filled with liquids, such as
vases, are placed on the apparatus.
L’appareil ne doit pas être exposé aux écoulements ou aux
éclaboussures et aucun objet ne contenant de liquide, tel
qu’un vase, ne doit être placé sur l’objet.
The mains plug is used as the disconnect device and it
should remain readily accessible during intended use.
In order to electrically isolate the apparatus from the mains,
the mains plug should be completely removed from the
mains outlet socket.
La prise du secteur ne doit pas être obstruée ou doit être
facilement accessible pendant son utilisation. Pour être
complètement déconnecté de l’alimentation d’entrée, la
prise doit être débranchée du secteur.
This apparatus is of Class I construction and must
only be connected to a mains outlet socket with a
protective earthing connection.
Terminals marked with the ( ) symbol may use
Class 2 Wiring, but voltages at these terminals may be
of sufficient magnitude to constitute a risk of electric shock.
The external wiring connected to these terminals requires
installation by an instructed person or the use of pre-made
leads or cords.
WARNING:
To reduce the risk of fire or electric shock, do not expose this appliance to rain of moisture
.
CAUTION:
Use of controls or adjustments or performance of prodedures other than those specified may result in
hazardous radiation exposure.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ÉLECTRIQUE - NE PAS OUVRIR
The lightning flash with the arrowhead symbol within an equilateral triangle, is intended to alert you to the
presence of uninsulated dangerous voltages within the product’s enclosure that may be of sufficient magnitude to
constitute a risk of electric shock.
The exclamation point within and equilateral triangle is intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the literature accompanying the appliance.
IMPORTANT SAFETY INSTRUCTIONS
VTX Series User Manual v1.0
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Safety Information ........................................ 4
Safety Notes regarding Installation ........................4
Safety Considerations and Information ................4
General Description ...................................... 5
VTX range main features .........................................5
Applicable Models ......................................................5
Block Diagram ............................................... 5
Front Panel Description ............................... 6
Rear Panel Description ................................. 6
Installation ..................................................... 7
Mechanical ...................................................................7
Ventilation ....................................................................7
Connections and adjustments .................................7
Protection ...................................................... 9
Bose® equalisation modules
(optional) ...................................................... 10
Installation .................................................................10
General Notes ............................................. 10
EMC Considerations ...............................................10
Earthing ......................................................................10
Appendix ...................................................... 11
Technical Specifications ..........................................11
General Specifications ............................................11
Location of jumpers and other internal
components ..............................................................12
Factory default jumper settings table ..................13
Contents
VTX Series User Manual v1.0
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Safety Information
Safety Notes regarding Installation
•
Do not expose the unit to water or moisture.
•
Do not expose the unit to naked flames.
•
Do not block or restrict any air vent.
•
Do not operate the unit in ambient temperatures above
35
O
C.
•
Do not touch any part or terminal carrying the
hazardous live symbol ( ) while power is supplied to
the unit.
•
Do not perform any internal adjustments unless you
are qualified to do so and fully understand the hazards
associated with mains-operated equipment.
•
The unit has no user-serviceable parts. Refer servicing
to qualified service personnel.
•
If the moulded plug is cut off the AC power lead for
any reason, the discarded plug is a potential hazard and
should be disposed of in a responsible manner.
Conformities
This product conforms to the following European EMC
Standards:
BS EN 55103-1:2009
BS EN 55103-2:2009
This product has been tested for use in commercial and
light industrial environments. If the equipment is used in
controlled EMC environments, the urban outdoors, heavy
industrial environments or close to railways, transmitters,
overhead power lines etc. the performance of the unit may
be degraded.
The product conforms to the following European electrical
safety standard:
BS EN 60065:2002
The VTX Series was developed and manufactured with high
quality materials and components, which can be recycled
and/or reused.
Safety Considerations and Information
The unit must be earthed. Ensure that the mains power
supply provides an effective earth connection using a three-
wire termination.
When the mains switch is in the off (‘O’) position the
live and neutral conductors of the mains transformer are
disconnected.
Caution - High Voltages
Do not touch any part or terminal carrying the hazardous
live symbol ( ) while power is supplied to the unit.
Terminals to which the hazardous live symbol refers require
installation by a qualified person.
Caution - Mains Breaker
VTX Series amplifiers are fitted with a resettable mains
circuit breaker instead of a replaceable fuse. This is located
on the rear panel above the AC mains input connector. The
circuit breaker may be reset by pressing it in; however, its
operation may indicate an internal fault. If the circuit breaker
operates immediately the power is restored, no further
attempt should be made to use the amplifier, and it should
be returned to your Cloud service centre or other qualified
person for repair.
Caution - Servicing
The unit contains no user serviceable parts. Refer servicing
to qualified service personnel. Do not perform servicing
unless you are qualified to do so.
Only a qualified service technician should remove the top
cover of the unit. Disconnect the power cable from the unit
before removing the top panel and do not make any internal
adjustments with the unit switched on.
Service personnel - do not disconnect the rear panel Earth
Safety tag until the unit has been completely isolated from
the mains. On re-assembly, ensure that the connection to
the Earth Safety tag is replaced before reconnecting the unit
to the mains supply.
If the unit requires repair, only fit replacement parts specified
by the manufacturer, or parts with identical electrical
characteristics. Substituting parts which are not authorized
by the manufacturer may result in fire, electric shock or
other safety hazards.
Only reassemble the unit using bolts/screws identical to the
original parts.
What’s in the Box
Please check the shipping carton for damage; if there is any,
please contact your Cloud agent and the shippers.
The packing carton should contain the following items:
• VTX amplifier
• IEC mains lead
• Set of mating screw-terminal connectors
• Set of four push-in feet (for free-standing use)
• This manual
VTX Series User Manual v1.0
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General Description
Cloud VTX amplifiers are a range of high power multi-
channel audio amplifiers intended for use with high quality
PA and music systems in locations where unquestionable
long-term reliability is the primary consideration. As well as
theatres, leisure centres and other major venues, they are
also ideal for airport terminals, railways stations and similar
large public spaces.
VTX amplifiers deliver excellent audio quality at all rated
powers and have all the facilities and features that installers
have come to expect from Cloud products. The VTX range
are the first Cloud products to offer a plug-in surveillance
card option, permitting the operating parameters and
settings of all networked amplifiers to be monitored
anywhere, using any computer’s standard web browser.
Applicable Models:
This manual describes the installation and operation of the
following models:
• Cloud VTX4120 4-channel amplifier
– 4 x 120 W into 4 ohms
• Cloud VTX4240 4-channel amplifier
– 4 x 240 W into 4 ohms
• Cloud VTX4400 4-channel amplifier
– 4 x 400 W into 4 ohms
All models are 2U, 19” rack-mounting units. Apart from
the output power rating, the three models are identical for
the practical purposes of installation and operation. Unless
specifically stated otherwise, the information in this manual
may be taken to apply to all models.
VTX range main features:
• High power multichannel amplifiers for “install-and-
forget” applications
• 120 W, 240 W or 400 W per channel into 4 ohms
(model-dependent)
• Extensive protection against short-circuit and reactive
loads, clipping, DC and overheating
• Chs1 & 2 and/or 3 & 4 may be operated in Bridge Mode
• Per-channel, front-panel LEDs for power status, signal
presence, peak level and protection
• Balanced line level inputs with gain trim
• Configurable for 4 channel, dual stereo or mono use
• Per-channel switched hi-pass filter
(18 dB/oct below 65 Hz)
• Optional VTX-WM1 card allows amplifier monitoring
from a standard web browser
• Optional remote volume control (per-channel)
• Optional Bose® EQ cards (per-channel)
• 2U 19” rackmounting unit
• Forced-air cooling
• Five year warranty
Block Diagram
fig.1: VTX Series Block Diagram
VTX Series User Manual v1.0
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Front Panel Description
1
POWER LEDs - (one per channel) – illuminate after
power-up sequence to confirm normal power supply
operation
2
SIGNAL LEDs – (one per channel) – illuminate when
the input signal level exceeds -26dBu
3
PEAK LEDs – (one per channel) - illuminate if
amplifier clipping is detected
4
PROTECT LEDs – (one per channel) – illuminate if
the internal heatsink temperature exceeds 90 °C
5
AC Power switch
6
Air intake grilles
Rear Panel Description
1
Input connectors (one per channel)
2
Input level controls (one per channel)
3
High Pass Filter controls (one per channel)
4
Input routing switches
5
Bridged mode switches
6
Remote volume control connectors (one per
channel)
7
Output connector
8
Bay for optional WM-1 surveillance card*
(cover plate fitted when no card present)
9
AC mains connector
10
Resettable mains circuit breaker
11
Earth safety tag
12
Air exhaust grilles
1
2
5
4
3
6
6
fig.2: VTX Front Panel (NOTE: VTX4120 shown – other models are identical)
CHANNEL 2
CHANNEL 1
CHANNEL 3
CHANNEL 4
CH3
CH4
CH2
SPEAKER OUTPUTS
0V
C
H
1
0V
C
H2
0V
C
H3
0V
C
H4
ON
OFF
ON
OFF
ON
OFF
BRIDGE
1-2
ON
OFF
BRIDGE
3-4
4 OHMS - MIN
BRIDGE
3-4
BRIDGE
1-2
POWER ~ 40-60Hz
10%
1
4
4
4
7
2
3
6
8
10
11
12
12
5
5
9
fig.3: VTX Rear Panel (NOTE: rear panel is identical for all models)
*The optional WM-1 surveillance card allows remote monitoring of the amplifier’s performance and settings from any computer via
a standard web browser. Full instructions regarding the installation, configuration and use of the WM-1 are contained in the WM-1
Installation and User Guide, supplied separately with the card.
VTX Series User Manual v1.0
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Installation
Mechanical
VTX amplifiers are designed to be mounted in a standard
19” equipment rack. The front panel is fitted with rackmount
ears for this purpose. Each amplifier requires 2U of
vertical rack space. See notes below regarding spacing and
ventilation.
Due to the units’ weight, the use of additional rear supports
is strongly recommended.
Ventilation
VTX amplifiers are force cooled by two thermostatically-
controlled fans mounted internally on the main PCB. The
fans are always operational, and run at a higher speed when
required.
Always allow adequate space around the amplifier(s) to
allow a free flow of air through the unit(s). Ensure that cable
bundles or other items do not obstruct any grilles.
In 19” rack applications we recommend leaving 1U of rack
space above and below each unit. Plain 1U blank panels,
not slotted ventilation panels should be used, as the latter
reduce the effect of forced-air cooling. The direction of
airflow in VTX amplifiers is front-to-rear; it is recommended
not to mix these amplifiers with other equipment employing
forced-air cooling which acts in the opposite direction
within the same rack.
If using the amplifier free standing, we recommend fitting the
feet supplied and placing the unit on a flat surface, leaving the
ventilation grilles free from any obstructions.
Connections and adjustments
Inputs
Each amplifier channel has an electronically-balanced input on
a 3-pin, 3.5 mm-pitch screw terminal connector. The mating
connector is supplied. Twin-core screened cable should be
used when driving the amplifier inputs from a device with a
balanced output. Single-core screened cable can be used when
connecting to an unbalanced source. Wire the inputs to the
source devices using the convention shown below:
Sensitivity and Gain Control
Control of input level is provided by a preset rotary
control adjacent to each input connector. The control
should be adjusted using a trimtool or small screwdriver.
Full attenuation of the input signal – i.e., zero output – is
obtained with the control fully anti-clockwise. Maximum
sensitivity is with the control fully clockwise; at this setting
the maximum output level will be produced for an input
signal level of 0.775 Vrms (0 dBu).
We recommend that the level for each channel should be
adjusted after installation is complete to ensure adequate,
but not excessive sound levels are achieved with the
programme material that will be used in practice.
Input Routing
To facilitate the use of the amplifiers in a variety of different
multi-channel applications, input selection switches are
provided on all channels except Ch1. This gives the installer
an easy method of paralleling channels from a single input.
Refer also to fig.1 on page 5.
The options are summarised in the table below:
SOURCE FOR Chs. 2-4
Button position:
OUT
IN
Channel 2
In 1
In 2
Channel 3
In 1
In 3
Channel 4
In 2*
In 4
*post Ch 2 switch
fig.4: Input Wiring
VTX Series User Manual v1.0
8
The three switches on the rear of VTX amplifiers allow a total of 8 routing possibilities, including 4-channel, dual stereo and
mono operation with 4 channels paralleled. The table below clarifies the options:
AMPLIFIER
CONFIGURATION
BUTTON POSITION
INPUT ROUTING:
AMPLIFIER CHANNELS FED BY EACH INPUT
CH 2
CH 3
CH 4
IN 1
IN 2
IN 3
IN 4
4-channel
IN
IN
IN
CH 1
CH 2
CH 3
CH 4
Dual mono + stereo
OUT
IN
IN
CHS 1 & 2
CH 3
CH 4
Dual mono + stereo
IN
OUT
IN
CHS 1 & 3
CH 2
CH 4
Treble mono + 1
OUT
OUT
IN
CHS 1, 2 & 3
CH 4
Dual mono + stereo
IN
IN
OUT
CH 1
CHS 2 & 4
CH 3
Treble mono + 1
OUT
IN
OUT
CHS 1, 2 & 4
CH 3
Dual stereo
IN
OUT
OUT
CHS 1 & 3
CHS 2 & 4
Quad mono
OUT
OUT
OUT
CHS 1, 2, 3 & 4
Remote Control of Level
VTX amplifiers are compatible with standard Cloud remote
control plates Type RL-1, allowing control of level from a
remote position. RL-1s may be connected at the rear 3-pin,
5 mm-pitch screw terminal connectors (REMOTE LEVEL),
using the wiring shown below.
Use two-core screened cable to connect the remote level
plate (maximum length 100 metres).
High Pass Filters
Each channel of the VTX is fitted with a switchable hi-pass
filter, which may be switched in as required to reject low-
frequency signals below 65 Hz. The filter has a slope of
18 dB/octave, to provide a high degree of low frequency
rejection.
The primary purpose of the filter is to avoid loudspeaker
transformer saturation when driving 100 V/70 V-line speaker
systems. (The VTX amplifiers’ outputs are designed to drive
low-impedances only, so an external transformer will be
necessary for amplifier channels to drive such systems. The
Cloud CXL-100T is suitable for use with the VTX4120;
transformers with higher ratings will be necessary for use
with the VTX4240 and VTX4400). Transformer saturation
creates unpleasant distortion and stresses the system, and
the high pass filter should always be switched in when
driving 100 V/70 V-line systems.
Use of the filter with low-impedance loudspeaker systems
is optional and at the discretion of the installer; switching
it in may help to enhance the clarity of speech, reduce
microphone handling noise and breath blasts.
Outputs
The VTX amplifiers’ speaker output connections are on
two adjacent 4-pin, 5 mm-pitch screw-terminal connectors
(mating connectors are supplied).
CH 1
CH 2
CH 1
CH 3
CH 4
-
+ -
+ -
+ -
+
Each channel’s output stage is designed to drive into an
impedance of not less than 4 ohms. Check the impedance of
the loudspeaker(s) in use and, taking into account any series
and/or parallel wiring, ensure that the total load on each
channel is not less than 4 ohms.
fig.6: Output Wiring
fig.5: RL-1 Wiring
1 2 3
REMOTE MUSIC
CONTROL
CONNECTOR
1 2 3
RL-1
USE TWO-CORE SCREENED CABLE
VTX Series User Manual v1.0
9
100 V/70 V-line operation
VTX amplifiers may be used to drive 100 V-line or 70 V-line
speaker systems with the addition of appropriate external
transformers. The Cloud CXL-100T is suitable for use with
the Model VTX4120, and one transformer will be required
per channel. A 2U rack-mounting tray (CXL-800) is also
available to facilitate the installation of up to eight
CXL-100Ts. Models VTX4240 and VTX4400 require
transformers with a higher rating.
Bridged Mode
VTX amplifiers may be operated in Bridged Mode to achieve
higher power outputs. Channels 2 and 4 are fitted with rear
panel mode switches; Channels 1 and 2 may be operated as
a bridged pair by setting the BRIDGE 1-2 switch on Channel
2 on; similarly Channels 3 and 4 may be bridged with
Channel 4’s BRIDGE 3-4 switch.
The principle of Bridged Mode is to feed the same input
signal to two amplifier channels, but with one input phase-
inverted. The “high” output terminals of the two channels
will therefore assume the same instantaneous voltage, but
of opposite polarity. In Bridged Mode, the load is connected
across the two “high” terminals, thus doubling the effective
voltage swing.
PHASE
INVERT
Ch. A
Ch. B
0 V
V
V
2V
0 V
+
+
When using pairs of channels in Bridged Mode, wire the
outputs in accordance with the diagram below:
CH 1
CH 2
CH 1
CH 3
CH 4
-
+ -
+ -
+ -
+
Note that no connection is made to the ‘0V’ terminal of
either channel in the bridged pair. Note also that Channels
1 and 2 may be operated in Bridged Mode while 3 and 4 are
in Normal Mode – and vice versa.
Protection
The amplifiers include comprehensive protection circuitry
to prevent damage to loudspeakers, the output devices and
other components in the event of a fault condition.
Thermal Protection
The output device heatsink temperatures are monitored and
the protection circuitry activated if any should exceed 90°C.
The red front panel PROTECT LED for the appropriate
channel illuminates to indicate the fault condition.
DC Protection
Crowbar protection is provided to safeguard the
loudspeakers in the event of DC being present at the output
terminals. This is an emergency protection system, and
its operation is liable to blow internal DC rail fuses. The
amplifier must be serviced before any attempt is made to
use it further.
Short-circuit/reactive load protection
VI limiting is implemented in the amplifiers to protect
the output stage from excessive voltage or current at the
output. This condition can arise from a short-circuit (or
near-short-circuit) across the output terminals, or from an
excessively inductive or capacitive load.
Switch-on protection
The protection circuitry is also activated immediately
after the amplifier is switched on. This is to prevent any
voltage spikes due to start-up conditions from damaging
the loudspeakers. The duration of the protection period is
approx. two seconds. When the amplifier is powered on,
all PROTECT LEDs flash briefly; the POWER LEDs do not
illuminate until after the protection period (assuming no
amplifier faults exist).
fig.7: Bridged Mode Principle
fig.8: Output Wiring - Bridged Mode
VTX Series User Manual v1.0
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Bose® equalisation modules
(optional)
VTX amplifiers are compatible with Bose® Series II
loudspeakers; a single-channel Bose® equalisation module
may be fitted to as many channels as necessary. Equalisation
modules for the following Bose® models are available:
• Panaray MA12
• Panaray 402-II, 502B and 502BEX
• Panaray LT Series: Models 3302, 4402, 9402 and 9702
Other modules are available to provide the correct
equalisation for loudspeakers from other manufacturers as
well as for other Bose® models; please contact Cloud for
more details.
Installation
• With the power turned off and the mains cable
removed, remove the top panel.
• Refer to the PCB layout diagrams at fig.9 on page 12.
The modules plug into the white 12-pin connectors
(J104 to J404) on the upper PCB adjacent to the rear
panel. Note the header connectors on the PCB have
two notches on one side only; these engage with lugs on
the equalisation module’s mating connector to ensure
correct orientation.
• After fitting equalisation modules to any channel(s), the
corresponding module bypass jumper(s) (J108 to J408)
must be removed in order for the module to function.
Refer to the PCB layout diagrams for full details.
• Replace the top cover with the original screws after
fitting.
General Notes
EMC Considerations
Cloud VTX amplifiers fully conform to the relevant
electromagnetic compatibility (EMC) standards and are
technically well behaved. You should experience no problems
interfacing units to other items of equipment and under
normal circumstances, no special precautions need to
be taken. If the unit is to be used in close proximity to
potential sources of HF disturbance such as high power
communication transmitters, radar stations and the like,
it is suggested that input signal leads be kept as short as
possible. Always use balanced interconnections wherever
possible.
Earthing
When several mains powered units are connected together
via their signal cables, there is a risk of one or more earth
loops which may cause an audible hum on the system even
with the gain controls set to minimum. The 0 V rail of a
VTX amplifier is directly coupled to the chassis ground. No
interconnection problems should be encountered, but if
there is any hum or other extraneous noise when source
equipment is connected, the situation can generally be
remedied by observing the following guidelines:
• Always connect sources using balanced connections
wherever possible, with the cable screen only connected
at the receiving end (amplifier input).
• Use audio isolating transformers (readily available from
trade suppliers) at the inputs if necessary. These will
ensure that the amplifier is electrically isolated from the
source equipment.
The signal source units should be located as close as
possible to the amplifiers and the metal housing of the
various units should not be electrically connected together
through the equipment rack. If this is a problem, rack
isolating kits are available from specialist hardware suppliers.
If the problem persists, try to connect all interconnected
units, including power amplifiers, to a common power source
to ensure a common ground is provided.
VTX Series User Manual v1.0
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Appendix
Technical Specifications
VTX4120
VTX4240
VTX4400
Output (Normal Mode)
120 W (4Ω)
240 W (4Ω)
400 W (4Ω)
Output (Bridged Mode)
240 W (8Ω)
480 W (8Ω)
800 W (8Ω)
Frequency Response
20 kHz to 20 kHz, +0/-1 dB; (HPF bypassed)
High Pass Filter
-3 dB @ 65 Hz, slope 18 dB/octave (switchable)
Distortion
THD + N <0.03% @ 1 kHz, 1 W output, 4 Ω load
Crosstalk
< -90 dB @ 1 kHz, -70 dB @ 10 kHz
Sensitivity
0.775 Vrms (0 dBu)
Input Impedance
10 kΩ, balanced
Noise (rms)
<100 dB below full output power, 20 Hz to 20 kHz
General Specifications
VTX4120
VTX4240
VTX4400
Inputs
Electronically balanced; 3-pin 3.5 mm-pitch plug-in screw terminal connectors
Outputs
2-pin 5 mm-pitch plug-in screw terminal connectors
Main Protection
By resettable rear-panel circuit breaker
Amplifier Protection
Clip Limiting, VI Limiting, DC Offset, Thermal & switch-on delay
Status Indicators
LED Indicators on each channel for Power Status, Signal Presence, Peak Level & Protection
Cooling
Two mid-mounted variable speed DC fans
Dimensions
(mm, W x H x D)
482.6 mm x 88.3 mm (2U) x 416 mm (exc. connectors); 450 mm (inc. connectors)
Weight
13.8 kg (net)
16.5 kg (net)
20.0 kg (net)
VTX Series User Manual v1.0
12
Location of jumpers and other internal components
fig.9: Jumper Locations
NOTE:
The following jumpers and connectors are relevant to the
optional VTX-WM1 surveillance card:
J109 - J409
J110 - J410
J107 - 407A
J801B, J802B
Full details are in the VTX-WM1 Installation and User Manual
BOSE® EQ
Card Sockets
BOSE® EQ
Card Bypass Jumpers
VTX Series User Manual v1.0
13
Factory default jumper settings table
Jumper/Connector
Function
Channel No.
Default Setting
J104
Bose® EQ card sockets
1
Empty
J204
2
J304
3
J404
4
J108
Bose® EQ card bypass jumpers
1
Present
J208
2
J308
3
J408
4
J107A
VTX-WM1 surveillance card interface sockets
1
Empty
J207A
2
J307A
3
J407A
4
J801B
All
J802B
All
J805B*
1&2
J806B*
3&4
J109
VTX-WM-1 card bypass jumpers
1
Present
J209
2
J309
3
J409
4
J110
1
J210
2
J310
3
J410
4
*These connectors are on the lower (main) pcb.
VTX Series User Manual v1.0
14
Bose® is a registered trademark of The Bose Corporation.
In the interest of continuing improvements Cloud Electronics Limited reserves
the right to alter specifications without prior notice.
Cloud Electronics Limited
140 Staniforth Road
Sheffield S9 3HF
England
Tel: +44 (0)114 244 7051
Fax: +44 (0)114 242 5462
email: info@cloud.co.uk
web: www.cloud.co.uk