Question about Alpine Car Audio & Video

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I have a stock stereo and two subs with an amp in the trunk. Also two alpine speakers in the rear. Whenever I turn my balance to the left my subs don't play. What's wrong?

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Hello.... I am sorry to hear you are having problems. The reason for this is that since you have a stock stereo, the shop (or person) whom installed the amp and subs used a line out converter. What this part does is allows the connection of RCA cables to the factory head unit. Almost all bass signals are always in stereo, so since you were only hooking an amplifier for just subs, you can actually just connect to just one of the rear speakers instead of connecting to the right and left. Just makes the install a little quicker. There is nothing wrong with this as I usually do the same thing in our shop. However, if you are going to be using the balance control, then you will need to go back to the shop and have them hook the converter up in stereo (to both rear speakers). Hope this helps!

20 year car audio/video installer
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Posted on Mar 15, 2011

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Sounds like the Left input to your subs is not connected. Check to make sure the RCA
cords are connected at the head unit (the stereo) and at the amp. If they are, then try reversing
the Right and Left plug ends. If Left comes to life then you know the RCA cable has been cut
somewhere. Replace the entire cord. If after switching, the Left is still dead then you either have
no left output from the stereo or you have a problem in the amp input. If it's the amp you either fix
it or buy another, cost being the key factor. I would pull the car in a garage and connect another
stereo, home or car to the Left input on the amp. If it comes to life then you know the stereo has
a bad subwoofer output. I am assuming you are using the Sub-woofer output from the stereo.
If you are using the speaker wires and using the High inputs to the amp my question would be,
do you have Left side speakers working at the point of input to the amp. Just hookup a speaker
to the speaker wire you are inputting at the amp. if you have sound then you know your signal from the stereo is fine, it must be the amp. Speaker outputs into an amp on the High Input connections are
not a good idea. Your best audio will come thru the RCA outputs on the strereo. However, I know
ya gotta do what ya gotta do!
This site is great for answering question on everything to do with electronics, audio and otherwise.
http://www.bcae1.com/

Posted on Mar 15, 2011

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