PD1 Preamp and FS1 Filter Near Release

The PD1 and FS1 boards are built and tested. The modular layout is really nice, I can pull out and swap individual pieces, and the system should be easy to fit in almost any cavity. Sound is great (see response curve below). I am starting on the first release boards, and expect to have pieces available in the store within a month!

Here are the frequency response curves for the system at low and high Q switch positions, and low, high, and mid frequency positions: