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Neil McCauley
05-02-2016, 11:43
Paul McGowan writes: In a recent post we covered with good detail the steps to achieving low bass with your subwoofers. By keeping the frequency lower than you need to match your main speakers you can focus your efforts entirely on getting the very low bass right. Now it’s time to match up to the mains.

Matching the mains should be done by simply turning up the low pass filter control on the subwoofer until you get a seamless presentation, but it turns out not to be all that easy every time. The tendency I’ve had with this adjustment is to get it too high – because a high setting on the low pass filter tends to give us a warmer, richer sound. That is very pleasing but also unnatural and, over time, you’ll get bugged by it.

The first thing I would do is look at your main speaker’s specifications. They will usually list the lowest frequency it supports by specifying what we call the -3dB down point. This means that the bottom end of your main speaker is “flat” to a point where its response drops off fairly quickly and as soon as the measurement device meter goes from the flat reference to -3dB (half power) that becomes the lowest the speaker goes.

A couple of things to remember about this setting:

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