FRONT PANEL
1. POWER SWITCH
Check the power amp AC making sure the rear plug is fully inserted before engaging the
power switch.The blue POwER LED indicates that all circuits are properly powered up.
2. FRONT PANEL BRIDGE LED INDICATOR
For fast front pannel indication of bridge mode or not. when the yellow LED is lit
the amplifier is in bridge mode. See 11 (rear panel) for more about bridge mode.
3. PROTECT RED 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 and the amplifier shut down to protect the speakers);
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) The RED PROTECT LED will illuminate when the output load draws excessive
current or a direct short is detected caused by a shorted speaker cable or speaker
system. when the short is removed the amplifier will resume operation. Check
for shorted cables and that the total speaker impedance is not below 2 ohms per
channel - 4 ohms bridged.
3) Overheating is usually determined when the amp stops in the middle of a
performance and the RED PROTECT LED comes on. if this is the cause, leave
the amp on for the fan to cool the amp down. The amp will automatically reset
within 3 minutes. The PROTECT LED will turn off when ready. Check for the
following conditions; a) The rear intake air is not restricted, b) The intake air
is not extremely warm, c) The front exhaust vents are not restricted, or d) No
excessive speaker load (try other speakers or remove speakers if you have more
than one connected to each channel).
Power supply protections are not indicated by the protection LED, but by the power
turning off completely. if the protected state is a thermal power supply issue or an
over current power supply issue, the power supply with reset it self and go through
the same turn on cycle as when first turned on.
4. CHANNEL LEVEL CONTROL
A precision input LEVEL attenuator is used to adjust the volume levels. To deliver the
amps maximum power without reducing the headroom of the signal source, the level
controls should be turned full on. For multi-speaker systems, the volume levels can be
used to match loudspeakers with different output sensitivity levels and room locations.
5. CHANNEL SIGNAL INDICATOR, 40% & 80% OUTPUT
You have a 3 meter segment per channel to indicate levels. The green SigNAL LED
indicator will start to flash when there is a low input signal (-30dBµ). The 40% and 80%
LED’s will light solid when output power has reached 40% and 80% levelsof full power.
6. CHANNEL CLIP INDICATOR
The RED CLiP LED indicators flash when each channel has reached its maximum
output. Occasional flashing caused by low frequency peaks are difficult to prevent and
will not harm speakers capable to handle the amplifiers output. However, consistent
flashing (excessive clipping/square wave) will damage speakers if not reduced. This
does not cause damage to the amp.
7. COOLING VENTS/FAN
Upon rack installation, the rear of the amp must be fully exposed to room temperature
air. The surrounding air should not be warmer than 120° with full loading and heavy
usage, or the thermal protection could active early. The front cooling vents are not to
be restricted. Air flows from back to front. The use of external fans need to flow the
same direction or the amplifier will starve for air and may thermal off.
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WARNING
This product produces high
sound pressure levels that could
damage your hearing. Use with
caution.
FRONT & REAR PANEL CONTROLS
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REAR PANEL
8. CHANNEL INPUTS
The XLR balanced inputs will help reduce signal interference and allow longer cable
runs from your signal source (mixer, etc). Because this is a balanced input, the gain
will be 6 dB higher than using an unbalanced 1/4” cable on the 1/4” TRS input jacks.
XLR pin configuration: Pin 1: ground, Pin 2: positive balanced signal, Pin 3: negative
balanced signal.
The 1/4” TRS jacks are balanced and designed to receive unbalanced input signals.
Balanced signals coming into these jacks should be wired with the connector’s tip
going to and the connector’s ring to signal -. The connector’s sleeve is tied
internally to ground.
9. PARALLEL “Y” INPUTS
The rear PARALLEL switch connects both channels together from either input. This
eliminates Y adapter cables. This feature is used to “daisy chain” one piece of equip-
ment to another. Just plug into the unused iNPUT (TRS or XLR) and it will become the
output for other equipment.
10. 100Hz LOW PASS FILTER SWITCHES
Each channel has a third order (18DB/oct)100Hz Low pass filter subwoofer crossover.
This makes it easy to add subwoofers to your system. in Bridge mode the channel
one low pass filter can still be used for full amplfiier power into a single bridged sub.
11. BRIDGE MODE
with your amplifier off, push “in” the rear (recessed) BRiDgE switch then make your
connections to the RED binding posts (ch 1 is + and ch 2 is-). in bridged mode, the
amplifier channels are out-of-phase from each other. Accidental pressing of the switch
will not cause damage, but the outputs will be out of phase and channel 2 input will
take in signal. WARNING: No other speaker connectors or binding posts may be used
at the same time! Use channel 1 iNPUT and LEVEL for bridge mode. Channel 2 is not
used, except for parallel to another amplifier (see 9 PARALLEL). The minimum speaker
impedance is 4 ohm. CAUTIoN: The power developed by bridging your amp can
destroy most speakers.
12. SPEAKER 1/4” AND SPEAKON™ COMBO OUTPUTS
The speaker connectors feature a combination of both 1/4” SPEAKER jacks for low
power applications and Speakon™ connectors for high power application. Secure the
Speakon™ connection by turning to the right to the lock position. Turn the amp off
before connecting your speakers.
13. SPEAKER BINDING POSTS
For wire (banana connectors), 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.
Binding posts are spaced on iSO standards.
For BRiDgE speaker connections (see 11 BRiDgE MODE).
14. AC POWER
Your amp is designed to auto switch to either 120V 60 Hz or 240V
50Hz. The voltage range for 120V is 95V to 132V and for 240V is 195V to 255V. The rear
heavy-duty AC receptacle will accept a universal grounded AC cord. Be sure to check
your power source before plugging into a grounded (3 prong) outlet. Firmly push the
AC cord all the way into the receptacle or the amp will not function. WARNING: Never
defeat the grounded connection or electrocution may result! FUSE: The fuse is located
within the main chassis near the AC connector on the PC card. Normaly if the fuse fails,
the amp will require service. See specifications chart for fuse values. NoTe: each amp
will require a dedicated circuit breaker for the amp to achieve its full output.
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