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Manafacture: American Audio File size: 3.13 mb File name: xlt_series.pdf Language of manual:

Connect your speakers to the outputs on the rear of the amplifier. Be sure that your front gain controls are turned down to their lowest level (full counter-clockwise). Turn your amp on. Turn your input source level up. Use your front gain controls to regulate the output volume. Be sure not to raise the volume to the clip level, however an intermittent clip signal is acceptable. Mono Bridge Operation - Page 15/Figure 15 details a mono bridge set-up. Be sure your amplifier and all other audio equipment is powered down. Flip the Stereo/Parallel/Bridge switch to the Bridge position. Connect an input signal to channel one. Connect your speaker across the red output binding post on the rear of your amplifier. Turn your equipment on (your amplifier should always be the last item you turn on). Apply an input source signal to your amplifier. Turn channel two gain up. Use the channel one gain to regulate your amplifier output. Bridged-Mono Mode Caution - The voltage across the output terminals of a bridged XLT Series amplifier may equal or exceed 100 volts RMS and may be as high as 130 volts. Use fully insulated CLASS ONE wiring, and the load must be rated for up to 2500 watts (@4 ohms) Parallel Mono - “Parallel ” ties the two channel line inputs together so that they will both be driven by the same signal, without the need for external jumpers or wiring. Both amplifier channels will operate independently. Though they carry the same signal, their gain controls affect only their respective channels, and they both must use their respected speaker outputs. Never attempt to parallel the speaker outputs, this may cause serious damage to your amplifier! This mode is recommended when using the XLT Series to run bass speakers, to achieve better low end. To run in parallel mono mode connect your system as you would if you were going to run in stereo mode. Then flip the mode switch to “MONO.” Be sure the amp is off or the power is disconnected before making any changes. ©American Audio® - - XLT Series Power Amplifier User Manual Page 11 PROTECTION: Thermal Protection - If the amplifiers operating temperature runs over 105°C (221°F) the amplifier will go into thermal protection to prevent damage from over heating. The Protect Indicator LED located on the front of the amp will light up, and the output signal will be muted. The fans will start to run at max speed to allow the amp to return to a safe operating temperature. To prevent amplifier over heating, make sure your input signal is not clipping (Red LED indicator located at the front), and that you are not overdriving the amp. Make sure not block the airflow input and output vents and always use the amp in an enviroment that is no higher than 30°C (86°F). Never use a speaker load that exceeds power or impedance ratings. VHF Protection - If the amplifier detects a VHF signal or excessive feedback, the amplifier will enter VHF protection after 3 seconds. The Protection Indicator LED located on the front of the amp will glow and the output will be muted. After 10 seconds the VHF protection mode will be disabled. After the protection circuit starts up, if the signal is still present the amplifier will remain in VHF protection mode. Clip Limiter - When the input signal overloads, the “CLIP LED’s” will 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. NOTE: If input signal is clipping or exceeds linearity working range of input circuit, then the Clip Limiter will not work. Short Circuit Protection - The XLT Series amplifiers all come with built-in Short Circuit Protection. If a short circuit is detected on the output signal, the Clip and Protect Indicator LEDs will both glow. This protection makes the output transistors work at a safe range and there will be no output from the amp. The amp will recover after 10 seconds after the terms of the short circuit have been removed. AC Local Power Protection - If the AC power voltage is lower than the required voltage (160V), the power supply will turn off automatically until the power voltage is normal. NOTE: The co...

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