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PROFESSIONAL POWER AMPLIFIERS

Limiter

The MP series comes with a built-in limiter. When the input signal overloads, the "CLIP LED's" indicate

a signal overload, at this time, the master volume should be lowered to reduce distortion. If the input gain level

is not reduced the built-in limiter will activate. During signal overload, the limiter will reduce the input audio

signal enough to minimize the amount of clipping. A limiter takes the gain of an overloading signal and reduces

it, the reduction in gain reduces distortion that can cause damage to your speakers and amplifier. During

normal operation below clipping, and momentary clips on peaks, the limiter does not affect the audio signal

and is inaudible. It will allow brief clipping of peaks and will only activate when continuous, hard clipping

occurs. During excessive clipping the limiter will reduce the audio signal enough to minimize the amount of

clipping. When the input signal decreases enough that clipping ends, the limiter will deactivate and cease its

gain reduction. The limiter has a fixed threshold and can not be adjusted.

Safe Power Levels at Different Output Loads

8-Ohm Loads: The amplifier can operate at practically any power level without risk of overheating. However,

if it is pushed hard enough to continually light the "CLIP" indicator, the amplifier's average output power

can reach 150 watts.

4-Ohm Loads: If the "CLIP" indicator flashes occasionally, the amplifier is approaching its maximum

long-term power capacity. If it is lit about half the time, the amplifier channel will probably go into thermal

protection within a few minutes.

2-Ohm Loads: Except for an occasional flash, keep the "CLIP" indicator dark to avoid overheating the

amplifier channel. Clipping should be kept to a reasonable minimum. An amplifier' s peak current draw at

full output power into 2 ohms is several times what the "normal" draw is, but its various protection

circuits will prevent this condition lasting more than a minute or two.

Short Circuit Protection

The MP series amplifiers all come with built-in Output Short Circuit Protects. The Output Short

Circuit Protection protects the output devices of the amplifier from short circuits and stressful loads. If your

speaker lines short, the amplifier automatically detects this problem and discontinues operation for that

channel. If one side of your amplifier becomes shorted and goes into protect mode, the other side will continue

to operate normally. During short circuit protection, the "Clip" LED will light simultaneously indicating

amplifier fault. The channel output during the "Short Circuit Protection" will be interrupted (i.e. no sound

output) Short Circuit Protection can usually be traced back to the signal output line (i.e. speaker line). Check

the line from the output terminal of the amplifier to the speaker. If this line good, check the internal speaker

connections and components. A short circuit will usually be traced to a bad cable or a bad speaker component

and is rarely traced to the amplifier itself.

Thermal Protection

Dual variable speed fans on the MP series amplifier provide adequate cooling. During low level output the

fans run at normal speeds. During high output and as heat raises, (exceeding 50° C), the fans will run at

higher speeds to aid the cooling process. If the heatsink temperature exceeds 91° C, the amplifier will mute

until the amplifier cools down. When the amplifier cools below 90º C, the amplifier will return to normal

operations. Be sure not to operate your amplifier below the minimum load ratings to reduce the risk of

overheating problems.

Input/Output Protection

The input circuits are isolated by 10k resistors. An ultrasonic network uncouples RF from the output and

helps keep the amplifier stable with reactive loads.

Operating Voltage (AC Mains)

The AC main voltage is printed on the back where the AC power input . Connecting to the wrong voltage

is dangerous and may damage the amplifier. Always be sure the source voltage for your areas matches the

required voltage for your amplifier.

MP SERIES

MP-3000 (2U MODEL)

MP-4000 MP-5000 MP-7000 ( 3U MODEL)

Protection

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