Built this wonderful little kit into my '91 Warwick Streamer Stage 1 last weekend, to replace the defective original MEC preamp This process was a bit of a hassle; it's tight fit into the relatively small electronics cavity of the Warwick. But after a little bit of puzzling it's a nice fit now. The only thing that didn't fit is the Glockenklang jacksocket. I happened to have a Switchcraft TRS (!!!!) socket lying around and that works perfectly.
Sound test: It really sounds great with the Warwick's MEC P/J pickups. With the EQ on neutral it's really neutral. When playing around the bass never gets boomy, treble never gets scratchy.
When the EQ is on neutral and you switch between active and passive, you won't hear a difference in sound or volume. It really stays the same.
And a nice, extra feature : In passive mode the treble knob works as a very subtle passive tone knob. I'm very happy with it and would recommend it highly!!