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Re: home audio help.
First calibrate everythign with a Radio Shack SPL meter. It's the best $40 investment that a home theater enthusiast can make. A calibration DVD with the SPL meter is even better since receiver test tones have been known to be off.
If that doesn't solve your problem, you need to plot the frequency response of your sub. Again, using the SPL meter and a CD of test tones. The software to generate the tones is free. All you have to do is burn them onto a CD. Based on the results, you may need to move your sub around to another location so that there are less peaks or nulls in your listening position. Sometimes an EQ is required to flatten the response. Details on all of this will require multiple postings so lets wait until we get to this point.
Finally, you may not have enough sub to meat your bass goals. You are just pushing it past the limits every time you listen. Sooner or later, it will give up if you keep bottoming it out. Do you hear a metal to metal CLACK? Or is it just heavy distortion? Distortion could be anything from amp distortion to pushing the driver past its linear limits but not mechanical limits. Bottoming out is pushing the driver until the voice coil smacks into the back plate of the magnet. If this is the case, an additional sub of the same model or replace it with a more capable sub.
-Robert
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