Here is a nice little sub, and is it small indeed, at 30 liters! It uses a Peerless XLS 10" driver (part code 830452) and two passive radiators, also made by peerless (part code 830468). This sub was designed to extend to ~22Hz in a very small enclosure. I personally did not make this sub, it was built by Mark Beaulieu, I did the design work for him (Mark can be contacted at markb1@cableone.net). Don't let the small box size fool you, this is a very capable sub. It is a 6th order design, as it uses active equalization to achieve a flat response taking into account the room gain. The bass is very clear, and for such a small enclosure, output is still over 110db. Output to 22Hz can even be made in as small as a 20L box if required. The sub is powered by a 250Wrms plate amplifier with remote from Parts Express.
The driver used is one from a favourite brand of mine, Peerless :) Features include extended pole piece, faraday ring in voice coil assembly for lower distortion, rubber surround, cast chassis, small box operation, and all the other well known features of the XLS series. See the 12" Peerless sub project for more info on driver choice.
Here are some pictures of the box being built, and the final pictures. They are rather large pics, and may take a while to load depending on what connection you have.
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