Hi,

recently wanna install Alpine Audio Processor which will be put somewhere in the middle of HU and Amplifier. while tidy up the connection before installing the audio processor, i noticed a possible fault but I'm not sure.

normally 4 channel amp, each channel will control 1 speaker right? well at least in my connection (see pics)



i noticed when i plug the RCA to Left side, CH1, the front and rear speaker is active at the same time. which I believed this is incorrect.



the speaker connection terminal is ok, no wire sharing involved. each terminal has it own 1 wire speaker.

is there any possibility that the Input Mode [1, ST, 1+2] at [CH 1/2], Input Mode [3, ST, 3+4] at [CH 3/4] and Input Channel [1/2, 3/4, 1+3/2+4] at [CH3/4] has to do with the symtom above?


can someone kind enough to explain in simple term for Input Mode [1, ST, 1+2] at [CH 1/2], Input Mode [3, ST, 3+4] at [CH 3/4] and Input Channel [1/2, 3/4, 1+3/2+4] at [CH3/4]??? I tried google but still cannot understand

This post has been edited by eddyann: Oct 28 2011, 11:59 PM

Input Channel Selector Switch

a) Setting this switch to 1/2 will send the signal at the inputs of CH1/2 to CH3/4 of the amp. This eliminates the need for Y adaptors when using a head unit with a single pair of pre-amp output.

b) Set this switch to 3/4 to have the inputs of CH3/4 accept independent input signals. An example of this application would be the use of a head unit with dual pairs pre-amp outputs.

c) Setting this switch to 1 + 3/ 2 + 4 will sum the CH1 and CH3 input and send it to CH3 while the CH2 and CH4 inputs are summed and sent to CH4. When used with a dual-preamp output head unit, this will provide a non-fading (constant bass) subwoofer output with fadable front and rear output going to a separate Satellite amplifier.

like in the google what I've searched

in my case, in order for a proper way to drive all the speaker in the speaker connection I should use???

[CH 1/2] Input Mode [1, ST, 1+2] => Set at ST
[CH 3/4] Input Mode [3, ST, 3+4] => Set at ST
[CH 3/4] Input Channel [1/2, 3/4, 1+3/2+4] => Set at 3/4

is this correct?

I don't use any preamp or whatsoever after the amp output. appreciate ya guidance

This post has been edited by eddyann: Oct 29 2011, 07:32 AM

yes