Coming Soon:
The B1 Buffer Preamp will be available in a matter of weeks. It is configured as a passive selector and volume control, but with a no-feedback JFET buffer that offers ultra low distortion and noise with ultra wide bandwidth. If passive preamps have not floated your boat in the past, you need to check this one out; it resolves several interface issues that have limited the popularity of passives.
The B2 Biamp Buffer. You say you tried bi-amping but didnt get sound you wanted? The B2 uses two pairs of the buffers found in the B1 but configured for splitting the output of the preamp with variable relative gain to two sets of power amplifiers. This allows not only isolated amplifier impedance buffering, but adjusts the gain levels for different amplifiers. Even for identical amplifier channels it also allows the subtle adjustment required to get exactly the top/bottom balance you need.
B3 Preamp. Maybe youd

a B1 but you need some gain.
The B4 Crossover / Equalizer has been designed around the needs of full range speakers (Lowther, Fostex, and all the newer entries). It has circuitry for equalizing to the needs of full range drivers and for adding a woofer.
B2, B3, B4 ก็น่าสนใจมากๆครับ รอต่อดีกว่า ไม่รู้เมื่อไหร่ท่าน Nelson Pass จะปล่อยวงจรออกมาให้ดู