Manual Clarion APX280M (page 4 of 14) (English)

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APX280M Power System Amplifier

• Gain Control - This allows you to set the nominal operating level of the

amplifier. The amplifier's range, 250mV to 2.5V for RCA inputs or 500mV to

5V for speaker level inputs, can accommodate input levels from virtually any

brand of source unit.

• Bass Boost Control- The amplifier also features a "high-Q" (i.e. narrow

frequency band) Bass Boost circuit. It acts much like an equalizer, with

adjustable gain (from 0 to +18dB) fixed at 45Hz. Use this feature to tune low

frequency audio response to compensate for a less than ideal subwoofer

enclosure design. The added boost produces rich, full bass tones that are

normally difficult to reproduce in the car audio environment. NOTE: If Bass

Boost is undesirable, set Bass Boost to 0dB.

High-pass/Low-pass Filter Controls

• Frequency (Hz) Selection Control - The crossover frequency is fully

adjustable between 55Hz and 5500Hz (via the Crossover Frequency Multiplier)

for a wide range of crossover points. Use this feature, along with your speaker

manufacturer's recommended crossover frequencies, to quickly design a more

advanced system (see Applications on page 6) NOTE: If the X-Over Mode

Switch is set to OFF, varying the Freq (Hz) Control will produce no effect.

• Crossover Frequency Multiplier Switch - When engaged, this switch

increases the crossover frequency by a factor of 10. Example: If the Freq (Hz)

dial is set for 240 Hz, pushing in the Multiplier Switch changes the setting to

2400 Hz.

• X-Over Mode Switch - This switch is equipped with a 12dB per octave

electronic filter for precise frequency attenuation with minimal phase

distortion. The steep crossover slope keeps midrange tones out of the

subwoofer and thereby eliminates an unnatural "nasal" tone quality in the audio

system. A filter is activated by sliding the X-Over Mode Switch to either LP or

HP.

• Input Mode Switch - This switch allows you to set the input mode. Stereo

input allows full left and right stereo operation. Right (bridged) input allows

single channel input for bridged operation. This is especially useful in high-powered

systems when using one amplifier for each subwoofer/speaker. L + R

(sum mono) allows a stereo input to be summed into a mono output.

• Speaker Level Inputs - These provide connections for a high-level stereo

source. In addition, these connections are provided for installations where the

source unit's RCA outputs are unavailable.

WARNING: When using the speaker (high-level) inputs, the Black wire must

be grounded at the Radio. Failure to do this will result in noise and improper

operation.

APX280M manual.qxd 3/12/2004 12:55 PM Page 2

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Clarion APX280M Manual

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