Trouble with 2 Amps
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=79253
Printed Date: July 05, 2025 at 5:01 PM
Topic: Trouble with 2 Amps
Posted By: scubasteve2011
Subject: Trouble with 2 Amps
Date Posted: June 17, 2006 at 7:00 PM
Hey guys. I;ve got an Alpine CDE-9845 Head Unit which has 2 PreAmp outputs. I've got a few problems at the moment. I will be wiring a 4-channel amplifier that requires 2 pairs of RCA cables to go into the preamp outputs in my head unit. The problem is that I'm assuming that I will have to do the same for the other mono amplifier that will be powering 2 subwoofers. Any suggestions? Another question is do I run a single power wire to the battery for each amplifier? Or is there a way I can run just 1 for both amps? Thanks for the help guys this place is great.
Replies:
Posted By: aznboi3644
Date Posted: June 17, 2006 at 7:08 PM
Run one power wire...4 gauge or bigger preferably.
Wire both preamp outputs to the 4 channel amp and use a small patch rca cable to send the signal from the 4 channel to the sub amp.
Posted By: scubasteve2011
Date Posted: June 17, 2006 at 8:35 PM
Will this affect the sound quality by doing it this way?
Posted By: forbidden
Date Posted: June 17, 2006 at 8:41 PM
Nope, unless your alpine has non gold plated rca's. If it does then all of your tunes will be in Dutch. If the 4 channel amp has a set of outputs on it, use the output from the 4 channel to go to the input of the mono amp. If the amp does not have rca outputs, does the mono amp? If it does, take the front preamp out and plug it into the mono amp, then take the outputs and plug them into the other input on the 4 channel amp. If neither amp has a preamp output on it, then purchase 1 pair of rca y cables, preferrably M - 2 F. Use this to split the rca cable at the 4 channel amp.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: scubasteve2011
Date Posted: June 17, 2006 at 9:46 PM
I found out that both amps have preouts. So ive got that rpblem solved, but now I have another one. When wiring the distribution block, should I do 8 gauge in and 4 gauge out to the battery? Cause 2 gauge wire is hella expensive at $3.50 a foot 
Posted By: killer sonata
Date Posted: June 17, 2006 at 10:26 PM
I think you meant 4ga in and 2 x 8ga out? the 4ga coming from the battery? if so that would most likely be just fine unless there is a huge amount of power draw im mising somewhere. ------------- "People with mullets live 40% longer" - Ricky Bobby
Posted By: aznboi3644
Date Posted: June 18, 2006 at 12:57 AM
May want to get a fused dist. block.
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