Full Text Searchable PDF User Manual
EXEL Exclusivas Electroacusticas S.A
Connect this unit s power cord only to an AC outlet of the type stated in this ow
-ner s Manual or as marked on the unit. Failure to do so is a fire and electrical
Do not allow water to enter this unit or allow the unit to become wet. Fire or elec
-trical shock may result.
Do not place a container with liquid or small metal objects on top of this unit
or metal ojects inside this unit are a fire and electrical shock hazard.
Do not place heavy objects, including this unit, on top of the power cord. A damage
power cord. A damaged power cord is a fire and electrical shock hazard . In particular,
be careful not to place heavy objects on a power cord covered by a carpet.
Do not scratch, bend, twist, pull, or heat the power cord. A damaged power cord is
a fire and electrical shock hazard.
Do not remove the unit cover. You could receive an electrical shock. If you th
internal inspection, maintenance, or repair is necessary, contact your dealer.
Do not modify the unit. Doing so is a fire and electrical shock hazard.
If lightning begins to occur, turn off the power switch of the unit as soon as possible,
and unplug the power cable plug from the electrical outlet.
If there is a possibility of lightning, do not touch the power cable plug if it is still
connected. doing so may be an electrical shock hazard.
In case an abnormality occurs during operation
If the power cord is damaged(i.e., cut or a bare wire is exposed), ask your dealer
for a replacement. Using the unit with a damaged power cord is a fire and elect
-rical shock hazard.
Should this unit be dropped or the cabinet be damaged, turn the power switch off,
remove the power plug from the AC outlet, and contact your dealer. If you con
-tinue using the unit without heeding this instruction, fire or electrical shock may
If you notice any abnormality, such as smoke, odor, or noise, or if a foreign object
or liquid gets inside the unit, turn it off immediately. Remove the power cord
from the AC outlet.Consult your dealer for repair. Using the unit in this condition
is a fire and electrical shock hazard.
- Locations exposed to oil splashes or steam, such as near cooking stoves, hum-
- Unstable surfaces, such as a wobbly table or slope.
- Locations subject to excessive heat, such as inside a car with all the windows
- Locations subjec to excessive humidity or or dust accumulation.
Do not place the power cord close to a heater. It may melt, causing fire or electrical
Hold the power cord plug when disconnecting it from an AC outlet. Never pull
the cord. A damaged power cord is a potential fire and electrical shock hazard.
Do not touch the power plug with wet hands. Doing so is a potential electrical
This unit has ventiation holes at the front and rear to prevent the internal tem
-perature rising too high. Do not block them. Blocked ventilation holes are a fire
In particular, do not
- place the unit on its side or upside down,
- place the unit in any poorly-ventilated location such as a bookcase or closet
- cover the unit with a table cloth or place it on a carper or bed.
Allow enough free space around the unit for normal ventilation. This should be:
5cm at the sides, 10cm behind, and 10cm above.
If the airflow is not adequate, the unit will heat up inside and may cause a fire.
To relocate the unit, rurn the power switch off, remove the power plug from the
AC outlet, and remove all connecting cables. Damaged cables may cause fire
or electrical shock.
(other than on the dedicated rack),
Closed, or places that receive direct sunlight.
Use only speaker cables when connecting speakers to amplifier outputs. Using
other types of cables is a fire hazard.
Turn off all musical instruments, audion equipment, and speakers when conne
-cting to this unit. Use the correct connecting cables and connect as specified.
Always lower the volume control to minimum before turning on the power to
this unit. A sudden blast of sound may damage your hearing.
Do not use this amplifier for any purpose other than driving loud-speakers.
If you know you will not use this unit for a long period of time, such as when
going on vacation, remove the power plug from the AC outlet. Leaving it conn
-ected is a potential fire hazrd.
Keep this unit away from the following locations:
Congratulations! You choose MH series, you choose the right thing. Security regulations
as stated before have to be obeyed when servicing the appliance.
TECNARE MHseries-professional audio amplifier, could meet the actual situation of amplfied
field. MH series combine advanced circuits, outstanding cooling system and appliance which make
sure the operational safety.
Functions and Features
High efficiency radiator, non-limited transmission cooling fan which make sure the unit is
working under low temperature.
Annular big transformer make sure enough powr supply.
Solid crust, alnico panel, standard installing hole.
Working condition under Stereo, Bridge, Parallel.
Fault on and audio output automatically stop when protection circuit done.
Limiting protection, on/off avoiding lashing, DC protection, output short circuit protection, over
heat protection, and so on.
Inside limiter is a very effective protective circuit which avoids damaging the speaker.
Very good audio frequency which has a very good signal conversion, for distortion and the
trueness and natural soural sound performance..
Level gain controling of front panel.
Working status of operation light signal light limit light protection light display light.
Press to toggle the power on or off.
Lights up red to indicate that protection is in effect. Specifically, lights up if the heat sink
overheats, or if a DC voltage is detected at the amplifier outputs. Also lights up for about
Three seconds at time of power-on, as the amp gets ready to operate. To provide protection,
the unit will not output any sound from the speakers while this indicator is lit up. When
Start-up is completed or the problem is corrected, the indicator goes off and normal oper
Lights up orange when the output signal distortion on the corresponding channel rises above
1% -indicating that"clipping" has occurred because the signal level is too high.
The -30dB indicator illuminates when the signal exceeds -30dB, and
the -10dB indicator illuminates when the signal exceeds -10dB.
If no iddication:
check gain settings and increase gain if necessary. Check input conn
-ections and audio sourece for signal. If the Clip LED illuminates with little or no Signal
Indication, check the output wiring for shorts.
if -20dB, -10dB LED illuminates with no signal input, there may be
system oscillations or some other malfunction. Disconnect the load and fully reduce the
gain. If the LED remains on , the amp may need servicing.
AC switch ON, LED will illuminate.
If no indication:
Check AC outlet.
Turn the gain controls clockwise to increase gain and counter clockwise to decrease gain.
The maximum voltage gain of the amplifier varies depending on the model is shown of the
designation. Maximum voltage gain for each model is shown on the front panel label in
parentheses adjacent the 0dB attenuation setting.
The Gain controls are marked in dB of attenuation.There are 21 detents for repeatable
adjustments. The upper 14 steps ate about 1dB each, and settings should normally be
made within this range. The range below -14 dB should not be usde for normal program
levels, as the input headroom could be exceeeded, but can be used for thesting at reduced
levels. At the minimum setting, the signal is completely cut off.
Please, make sure to check whether the voltage selector shows the correct mains
voltage that matches the local mains supply at the installation site. An appropriate
mains cord is included in the package.
The inputs INPUT A & INPUT B are connect to mixing consoles. The XLR-type
connecting OUTPUT A & OUTPUT B are prepared for through-connecting input
signals to additional external power amp s. The input signal is directly routed to these
output connectors. Accordingly, input and output connectors of the corresponding
channel are interconnected in parallel, offering permanent electrical connection,
without regard to the setting of the Power-ON switch.
Although having XLR-type output connectors, some mixing console models provide
unbalanced output connection only. when using mixers with unbalanced outputs,
bridging PIN1 and PIN3 of the power amp s input connectors or leaving PIN3 of the
cable s plugs unconnected is necessary. Otherwise, when feeding in unbalanced
audio signals via PIN3 (B,-, cold) and PIN2 (A , + , hot), strange humming and HF-
interference may occur, which very likely will damage the power amplifier and /or the
connected speaker cabinets.
NF- connection cords
Choosing high-quality balanced cables( two conductors for the audio signal plus sepearate shielding
mesh) with XLR-type connectors is recommended for LF-signal connection. Although connecting
unbalanced cables to the power amplifier inputs is possible as well, using balanced cables is always
preferable. A great number of today s audio appliances employ balanced outputs. With balanced cabling,
the shield connects all metal enclosure parts and therefore efficiently eliminates the introduction of
external interference-mostly noise and hum.
XLR-type connector pin-assignment
Power amp has two output channels. Channel A and Channel B is provided via
which SPEAKON-type output connectors.
Selecting Stereo / Parallel / Bridge Mode
Each channel within the pair remains independent, and each may be used for a different
This setting connects both inputs of a pair together. One signal feeds both channels. Do
not connect different sources to each input. Each channel s gain control and speaker
connection remain independent.
This setting combines both channels of a pair into a single channel with twice the output
voltage. Use only the first channel s input and gain control. Set the second channel s gain
control at minimum.
8 Ohms bridged
4 Ohms bridged
Current Draw Table(in Amperes)
This table provides typical current draw for each model as a function of load output power level.
Units of measurement are Amperes r.m.s.
NOTE! Current draw shown is under 220V. For 230V models, multiply values shown by 0.96; For 120V models, mu
-ltiply values shown by 1.83; For 100V models, multiply values values shown by 2.2 .
- 1/8 power (pink noise) represents typical program with occasional clipping.Use this rating for
- 1/3 power (pink noise)represents severe program with heavy clipping.
- Full power(sine) is continuous sine wave driven at 1% clipping.
Audio limiters, high temperature, short circuit
20k¦ / balanced,
Rated output power
Maximum bridged output power
Maximum RMS voltage swing
(at 1/8 maximum output power, lim. pink )
(at rated output power or voltage,1kHz)
THD at rated output power
(ref.1kHz, at 10% rated output power)
(at 100Hz/1kHz 8¦ )
Signal to noise ratio
(W x D x H)
Please note: Every information is subject to change without prior notice.