even a cheap Jensen amp from walmart can sound decent. Are you getting distortion? Static? are you running a low pass crossover or does the amp have one? What do you have your gain set at? Are you running the channels bridged? Stock head unit or aftermarket (how is it hooked up to the amp)?
If it's distortion or static, it could be wiring issues. Could be the RCAs are running too close to the main power source and are poorly shielded. Or poor ground. If you are not running any sort of low pass filter, you will get a lot of distortion because the sub is designed for lows and you're send full sound. Sometimes people turn the gain way up on the amp to get more power, but the higher the gain, the more distorted the sound. If you bridged the channels, you could have easily overpowered the sub with a 400W amp. When you bridge the channels it effectively doubles the power output of the amp and per above your speaker is only rated at 150W.
Another thought, are you using a line out converter? Are you using the stock head unit and using a speaker level output converter to an RCA ? This usually has a gain setting also and they are notorious for distortion if not set up right.
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Last edited by jkx0778; 04-06-2011 at 03:21 PM.