Numark Industries 3, 4 Front Panel Diagram

DIMENSION 3 & 4 AMPLIFIERS

- The Leader in DJ Technology

Front Panel Diagram

1. Power Switch- Press to turn amplifier on and off. Always turn your amplifier on last and off first to avoid speaker

damage.

2. Stereo/Mono Selector – This switch controls the input signal. Note: If Bridge button on the rear is active, then

this button will have no function.

3. Level controls- Rotate controls clockwise to increase volume.

4. Signal meter- Lights up as output wattage is increased.

5. Clip LED – Lights up when the unit volume exceeds maximum output and is eno ugh to send a clipped signal to

your speakers. Consistent lighting of these LEDs can cause both amplifier and speaker damage. With clip

protection on, the volume will automatically be limited so the output c an not send a clipped signal. When running

your amplifier at maximum try to avoid lighting the RED clip LED eve n if limiting is on.

6. Status LEDs-

a) Sub - indicates that the crossover has been activated in the rear and the channel output is set for subwoofer

usage.

b) Mono– lights when unit has been placed in mono

c) Stereo – lights when the unit has been set to play in stereo

d) Bridge – lights when the rear panel bridge selector has been activated

e) Protect – lights up when the unit protection circuitry has activated.

Protections include:

Power up: output is muted to protect speakers during power up in case of transients

Input: 10k resistors protect the input from overload.

Output: Special circuitry removes RF (radio frequency) from the output. It also hel ps keep the amplifier stable

with reactive loads.

Thermal: Dual-speed fans draw air through the amplifier over heatsinks for rapid cooling. At low usage the fans

run at normal speed. During high output the fan will run at high speed to coo l the unit. When temperatures

exceed 90°C the amplifier will mute until it cools down.

Short Circuit: This protects speakers from short circuits and stressful loads. During short c ircuit protection, the

“CLIP LED” and “PROTECT LED” will light simultaneously indicating an am p fault problem. All channel output

will be muted. Faults can usually be traced to Speaker wires and connector s or shorted speaker drivers. Check

your cables thoroughly from the outputs to the speakers. If the line is good, check the speakers themselves and

any internal components.