Installation manual

clarion 4 Channel Power System Amplifier
RIGHT, FRONT LEFT, REAR RIGHT and REAR LEFT. The Gam Controls
provIde a wIde adjustment range to accommodate output levels from any brand
of source umt.
• Gain Controls - Seperate Front and Rear Gam Controls allow you to set the
nommal operatmg level of the amplifier. The amplifier's range, 250mV to 2.5V
for RCA mputs or 500mV to 5V for speaker level mputs, can accommodate
mput levels from vIrtually any brand of source umt.
• 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 gam (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 nch, full bass tones that are
normally difficult to reproduce m the car audio enVIronment. Note: If Bass
Boost IS undesIred, set Bass Boost to OdB.
High-passlLow-pass Filter Controls
• Freq (Hz) Controls - The front crossover frequency IS fully adjustable
between 55Hz and 550Hz. The rear crossover frequency IS fully adjustable
between 55Hz and 5500Hz (vIa the Rear Crossover Frequency MultIplier) for a
wIde range of crossover pomts. 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 eIther of the X-Over
Mode SWItches IS set to OFF, varymg the Freq (Hz) Control will produce no
effect.
• Rear X-Over Frequency Multiplier Switch - When engaged, thIS sWItch
mcreases the crossover frequency of the rear channels by a factor of 10.
Example: If the Freq (Hz) dial IS set for 240Hz, pushmg m the multIplier
SWItch changes the settmg to 2400Hz.
• X-Over Mode Switches - These sWItches are eqUipped wIth 12dB per octave
electromc filters for preCIse frequency attenuatIOn wIth mimmal phase
distortIOn. The steep crossover slopes keep mIdrange tones out of the
subwoofer and thereby elimmatmg an unnatural "nasal" tone quality m the
audio system. Each filter IS actIvated by sliding the X-Over Mode SWItch to
eIther LP or HP.
• Input Mode Switches - These sWItches allow you to set the mput mode for
front and rear channels. Stereo mput allows full left and nght stereo operatIOn.
RIght (bndged) mput allows smgle channel mput for bndged operatIOn. ThIS IS
espeCIally useful m hIgh-powered systems when usmg the APX400A as a
bndged 2 channel amplifier. L + R (sum mono) allows a stereo mput to be
summed mto a mono output.
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