FRONT PANEL
1. MOUNTING
Sturdy one piece aluminum handles make for easy transporting along with facilitating rack installation.
The rack mounting holes are designed on ISO standard spacing. Four 10-32 x .5” phillip machine screws
are normally used to secure the amp. Rear support brackets are not required.
2. POWER SWITCH
Check the power amp connections and verify the AC line power source before engaging the POWER
switch. The red LED unmistakably indicates that all circuits are properly powered up. Yellow was chosen
so the operator could see the other indicators from a distance.
3. CHANNEL LEVEL CONTROL
A precision 41 step input LEVEL attenuate is used to adjust the volume levels. To deliver the amps full
power without reducing the headroom of the signal source, the level controls should be turned up approx-
imately 1/3 (15 on the dial).
4. DUAL 9-BAND GRAPHIC EQUALIZERS
Controling feed-back in a monitor system and fine tuning your sound are easy with the HT760M’s two
on-board EQ’s. For feed-back, find the offending frequency (usually in the upper bands) and push the
slider down to cut the level of that frequency, thus allowing more gain (volume) before feed-back. For
tone control, move the sliders up or down from their center detent positions to suit your taste. The slid-
ers are designed to move hard so adjustments will stay in place.
5. CHANNEL CLIP INDICATOR
The red CLIP LED indicators will start to flash when each channel has reached its maximum output. Occasional
flashing caused by lower bass frequencies is OK. However, consistent flashing caused from higher frequencies
may damage high frequency drivers (excessive distortion). This does not cause damage to the amp.
6. PROTECT LED INDICATOR
The red PROTECT LED provides the operator with information about the status of the amplifier. The
PROTECT LED can come on under 3 different conditions (when this happens both channels are muted
by disconnecting the output speaker relays);
1) During power-up, the amplifier stays in a muted state for approx. 3 sec until it determines that
everything is functioning normally (no output shorts or over temp conditions).
2) When the output load draws excessive current or a direct short is detected caused by a shorted
speaker cable or speaker system. Reset this condition by turning the amp off for two seconds and
then on again. Check for shorted cables and the total speaker system impedance connected to
each channel (2 ohms minimum per ch or 4 ohms BRIDGED).
3) Overheating is usually determined when the amp stops in the middle of a performance and the
PROTECT LED is on. If this is the cause, leave the amp on for the fan to cool the amp down. The
amp will automatically reset within 1 to 3 minutes. The PROTECT LED will turn off when ready.
Check for the following conditions; a) The rear intake air is restricted, b) Intake air is extremely
warm, c) Front exhaust vents restricted, or d) Excessive speaker load (try other speakers or remove
speakers if you have more than one connected to each channel). Again, the minimum impedance
is 2 ohms per ch or 4 ohms BRIDGED)
REAR PANEL
7. COOLING FAN
The fan is designed to pull air in to the amplifier. Do not restrict or block its intake or the amp will go
into protect mode. Hot air entering the amp may also cause the amp to go into protect mode.
8. XLR CHANNEL INPUTS
For most professional applications, use the XLR balanced inputs. This will help to reduce hum and allow
for longer cable runs from your signal source (mixer, etc). Because this is a balanced input, the gain will
be 6 dB higher than using the 1/4” input jack with non balanced lines. XLR pin configuration: Pin 1: Grounded
through the GROUND LIFT switch, Pin 2: positive Bal. signal and Pin 3: negative Bal. signal.
9. CHANNEL 1/4” PHONE JACK INPUT
This stereo phone jack is designed to receive either balanced or unbalanced input signals. Balanced sig-
nals coming into this jack should be wired with the connector’s tip going to and the connector’s
ring to signal -. The connector’s sleeve is then tied internally to ground through the GROUND LIFT switch.
10. PARALLEL OR “Y” INPUTS
The rear PARALLEL switch allows you to drive both channels from either input. All signals entering any
input will be available on both channels. This eliminates Y adapter cables. This feature is used to “daisy
chain” one piece of equipment to another. Just plug into the unused INPUT (1/4” or XLR) and it will
become an output for other equipment.
11. INPUT GROUND LIFT
Many times sound systems are connected in such a manner to cause a grounded loop with the inputs
that result in audible hum. The input (1/4” & XLR) GROUND LIFT switch on the rear panel will help elim-
inate this problem. If not, another way to eliminate ground loops is to install a “line matching” trans-
former between the amplifier input and the signal source.
12. LIMITERS
To activate the LIMITERS, engage the rear limiter switch. The built-in high quality limiters are recommended
to hold down peaks that could cause early distortion. Limiters will help to rise the average power so that
you can get more output from each channel. To check the effectiveness of the limiters when the channel
starts to distort (under the amps full output), engage the limiters and hear the reduction of the distortion.
If the distortion stops, you can turn the channel up for more power. The lower bass frequencies are most
affected. WARNING: Do not check in an environment where the sound level could damage your ears!
13. SPEAKER OUTPUTS
The standard 1/4” SPEAKER jacks are used for most applications. Turn the amp off before connecting
your speakers.
14. SPEAKER BINDING POSTS
For heavy-duty speaker connections, use the rear BINDING POSTS to connect your speakers. Wire sizes up
to 7 gauge (50 amps) can be inserted into the binding post “side holes”. Larger cable can be used with “banana”
plugs which plug into the end of the binding posts (remove colored caps). Binding posts are spaced on ISO
standards. Use the two center RED binding posts for BRIDGE speaker connections (see 15 BRIDGE MODE).
15. BRIDGE MODE—
25V/70V DISTRIBUTION SYSTEMS
The “DCM” Series can be operated in bridge mode if you require a 25V / 70V distribution speaker system
or a high powered mono (single channel) amp. With your amp off, push in the rear (recessed) BRIDGE switch
after you have made your speaker connections to the rear center RED binding posts (ch 1 is + and ch 2 is -
). No other speaker connectors or binding posts can to be used at the same time!”. The INPUT and LEVEL
is handled by channel 1. Channel 2 is non-operational. The minimum speaker impedance is 4 ohms or a 25V
distribution line. CAUTION: The power developed by bridging your amp can destroy most speaker systems!
16. AC POWER
Your amp is designed to run on either 120V 60 Hz or 230V 50Hz depending on the model purchased.
The voltage range for 120V model is 95V to 132V and for 230V model it is 195V to 253V. The rear heavy-
duty AC receptacle will accept a standard grounded AC cord that is designed your country. Be sure to
check your power source before plugging into a grounded (3 prong) outlet. Never defeat the grounded
connection or electrocution may result! Firmly push the AC cord all the way into its recepticle.
17. AC CIRCUIT BREAKER
We have provided you with the convenience of a circuit breaker so that you will never have to replace
a fuse. Occasionally the circuit breaker on your amp may have to be reset if high AC voltage surges are
present or if the amp is used with excessive loads.
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FRONT & REAR PANEL CONTROLS
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