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If both the left front and left rear channels are out, reverse the RCA cables to determine if the problem is signal related. If the left side plays when you reverse the RCA cables, reverse them at the head unit to see if the audio changes sides. If it does, the head unit is likely the problem. If it doesn't switch sides when you switch at the head unit, the RCA cables are the problem.
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The wires could be shorting or have a bad connection any where in the length from the radio to the sub woofer. I lost all sound in my Tahoe and thought that the connection was at the radio but never found a problem. One day on a hard left turn a loose chair in the back area of the Tahoe struck the right side panel which has the speaker and everything starter working.
Does it only happen on that channel. It is a 4 channel amp so make sure the other channels are working. It sounds like an RCA input prob. Try the sub on the other channel. if it works then it would be your RCA input needs resoldered.
Choosing a amp isn't always easy but it first begins with what you want.
--RMS of the speakers is what you want to use to find your amp. That's going to tell you what watt's your speakers can REALLY handle @ 4 ohms. --Also what you want to spend $$$ will determine how clear it sounds. --I prefer a Rockford Fosgate amp for base and kenwood for highs. --Also look at the RMS watt's rating to find the proper power and go a bit beyond what you want so that the amp performs with ease. --Last but not least you chose the amp for how many speakers you are going to connect to that amp. For example if you are using 2 JL audio 12" for subs, then a mono amp is perfect. But if you are connecting 4 speakers, you should begin to find the amp with four channels so that you obtain left, right , front and rear sound.
Although amps with 5 channels are pretty rare, you can get one. Alpine, Boston Acoustics, Infinity, JL audio, MTX, and Polk all have 5-channels ranging in price from around $350 up to around $1,000. The Alpine PDX-5 will output 75X4 watts RMS for the front and rear stereo channels and 300 watts to the mono sub channel. It is priced at $599.99 at Crutchfield.
JL W6's will perform well with from 150-600 watts RMS. W7's with from 150-500 watts. Less expensive Alpine Type R's work OK with from 200-500 watts RMS. Either of the brands will sound good. None of them will perform to their full potential with 300 watts RMS. Powering any sub with a 2-channel amp is a compromise. A monoblock is more efficient.
I had the same amp! It is the JL 300/4 and one of the chanels came in really fuzzy. It sounded as if the the wires were touching during my installation. I called JL and a JL authorized dealer it would have costed me 190 dollars total to get the amp fixed. Instead I opened up the amp to see if anything looked out of the ordinary. When you open the amp, see if the green fuse looking things are aligned. If they are not aligned then straighten them out. I think they had gotten out of place from being dropped becaue I baught my amp used. My amp works perfectly now!
This is no joke man, I did this just yesterday and was really excited to save 190 bucks. I'm not a technical guy or anything all I know is the green things are located behind the out puts inside the amp.
These are very complex amps that mainly use surface mount components. This amp has 4 vertical boards for the individual channels. It's difficult to work between boards and it's easy to damage the main board if you don't have good quality equipment to desolder them. If you want to learn to repair audio equipment, this is not a good starter amp. I'd suggest sending it to JL or a reputable local shop.
If you're lucky, it could simply be a case of a dirty contact on a switch or a switch that's not set correctly. Try moving all of the controls and switches before sending it off for service.
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