I have 18 transactions on Audiogon, all positive. View here: https://www.audiogon.com/users/krisgelGR SW-12-4ohm (12-24 dB/octave) and A370PEQ amplifier with HPF out.
http://www.rythmikaudio.com/GRci.htmlhttp://gr-research.com/servosubkit2.aspxFast, musical bass, down to 15 Hz.
This kit has never been used. I sent it to Omega Loudspeakers to have him build me a custom subwoofer that matched my Omega mains, but decided not to have him build it in the end. He loaded the amp and speaker in a test cabinet and then packed everything up and sent it back to me.
New price: $629 + shipping
Your price: $350 + shipping and PayPal