S-1 electronic subwoofer/satellite crossover with parametric frequency controls and active room equalization.
The S-1 is connected with RCA cables between pre and main amplifier or integrated amplifier via the PRE-OUT and MAIN-IN RCA jacks. The signal for the main stereo speakers can be routed through the high pass filter, before being fed back to the main/power amplifier thus relieving the main speakers from unwanted bass signals.The subwoofer signal can be completely and variably adjusted to the subwoofer and individual room acoustics before it is fed to the mono or stereo amplifier (MAIN IN OR AUX),or to power the subwoofer.
Full details, specs and implementations in the S-1 user manual
110v only at this time.

Shipping weight: 1kg
Airmail cost $25 to Europe/US, $20 to Asia