Subwoofer Equaliser

Posted on Jul 24, 2012

The Linkwitz transform circuit (or EAS principle) will allow any driver to extend to 20 Hz or even lower. A good quick test is to stick the speaker in a box, and drive it to 50 or 100W or so at 20 Hz - you should see a lot of cone movement, a few things will rattle, but you shouldn`t actually hear a tone. A `bad` speaker will generate 60 Hz (third harmonic) - if you don`t hear anything, the speaker will work in an equalised sub.

Subwoofer Equaliser
Click here to download the full size of the above Circuit.

A simple mixer circuit is shown in Figure 1, and this is simply be added to the front end of the circuit in Figure 2. The mixer stage completely isolates each channel from the other, since the summing point is a "virtual earth" because of the f

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