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Originally Posted by ponchonutty
Guys, you will always get the best sound when using a stereo with dedicated RCA sub outputs period. I have been in the bizz for many years now and have tried all that I can do with all kinds of cars but it just never works well. Usually it is a tuning problem where either it is too bassy or not enough. On the Alpine/Ford units, the problem lies with the way the speaker outputs work. If they read less ohms(this happens when a speaker is being over worked or if you add line level outputs for another amp) it adjusts the bass output accordingly. The way that I got around this was bridging the rear channels together by taking the (+) from one rear speaker and the (-) of the other into one channel of the RCA converter. It still wasn't the best but seemed to work better.
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Okay, you may be on to something suggesting impedance mismatch with the amp attached to the speaker. It would be ideal to use the connector in the trunk with the preamp signals, but they are too low for my amp. I tried measuring the voltage at the connector and couldn't even get a reading on the meter. Does anyone know what the voltage here is? Is it a regular preamp signal that should work in any amplifier? And, would it be possible to boost it so I get decent voltage to my amp? I was thinking about building an op-amp circuit to amplify that voltage, but that may be a bit of an undertaking. Unfortunately, I don't have an o-scope to look at any of these signals to see what's really going on. And, I don't know how different audio signals work (speaker vs preamp), so I can't really build anything off theory. Are there any products on the market made for boosting a preamp signal before the amplifier? I've seen one or two things that look like they might, but the descriptions are a little vague. Anyway, I'd appreciate any thoughts.