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So I put in a new Sony CDX-GT330. It has two pairs of preamp outputs; one front, and one "rear/sub". It should be labeled "sub/rear" instead! (Can you see where I'm headed?)
At first, I wasn't completely pleased with the sound, but was too busy to figure it out and adjust everything. My friend borrowed my car (I can't blame it on him -- I didn't even have the gain up halfway, and it's my own **** fault) and he called me freaking out, saying that after 15 minutes of listening to the radio, the "back speakers have blown." I first attributed this to the amp overheating and not blown speakers. And I was right -- about the speakers not being blown. It was the rear channels. I first deduced this by realizing that nomatter the fade/balance settings, the rear speakers were always on. On and crackling. So I turned the HU off, scrolled through the settings, and lo and behold: the default setting for the rear channel preouts were "sub", and not "rear."
I already went an ordered a new amp. But my question is, What can I do with my now-2-channel amp? Is there a (semi-) easy way to fix it? Can I get a few bucks by sending it in for refurb? What I don't want to do is just throw it out....
Unfortunately, amplifier repair is usually beyond the abilities of consumers. I have a background in radar repair, and I've had many amps go bad, a dozen at least, and only once was the problem obvious enough to fix without bench-test equipment.
What i don't understand is why it blew in the first place. I have 2 infinity amps, and they take plenty of abuse. Sending it a subwoofer pre-amp signal should pose no difficulty to the amp. Many installs are done this way on purpose, usually with the amp in mixed-mono operation. Before you crack it open, make 100% sure that those rear speakers aren't actually the problem. Really easy to check, just connect them to the front channels since you know they're working. Another possiblility is the RCA's are damaged, but that's far less likely. That's also an easy check, just swap the front and rear pre-outs going into the amp. If all that proves your amp is the problem, well at least you have one coming. You won't get much money turning it in, even if it was working perfectly. They mostly want newer head units.
I don't think of infinity as the highest brand on the market, but they're no discount slouch either. I think they offer a good selection of features and value. You should expect a new amplifier from them to last many years. Exploding channels is not a common complaint. It may be worth your time to check the impedance of the left-rear speaker. It may be grounding to the chassis, so check one of the speaker leads with a multi-meter and see if there is continuity from a ground to the speaker. If that doesn't reveal a problem, my only other suggestion is to purchase from an authorized dealer who honors the manufacturer's warranty.
I tried that, and indeed it is the amp and not the speakers. Another point to note out was that the amp was purchased as a floor model from Best Buy. However, it sounded fine at first, with my older HU.
I guess I now have a 2-channel amp. I'm thinking of selling it for cheap to a friend who plans on getting a Rockford Fosgate P1 sub to supplement his system.
Thanks for the reply! John
Okay, so I got a new one....and a month later....the rear-left channel explodes, Why does this keep happening? Is it a wiring issue? Or is Infinity just a poor brand?
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