Front Views & Rear Views
Introduction
Unpacking
Installation and Mounting
Front Panel
Rear Panel
Operation
Mode Selection
Specifications
Protection
Limiter
The X 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 X 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 X 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 90° 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.
Protection
page 13
X-3000 <2U MODEL> / X-4000 X-6000 <3U MODEL>
UNiK A
P R O F E S S I O N A L AU D I O
