op you may want to look at codas csib designedby doug dale who worked with nelson at threshold
codas csib is configurable youcan order it as a 150 250 or 400watter
Specs
Rated Power
V3: 400 watts @ 8Ω
800 watts @ 4Ω
Class A to ~8W @ 8Ω
V2: 250 Watts @ 8Ω
500 Watts @ 4Ω
Class A to ~12W @ 8Ω
V1: 150 Watts @ 8Ω
300 Watts @ 4Ω
Class A to ~18W @ 8Ω
Maximum Current: 130 Amperes peak
Noise: -130dB referenced to rated output
Input Impedance: 50kΩ unbalanced/1k balanced
Output Impedance .04Ω from 20Hz to 20kHz
Frequency Response: DC to -3dB @ 100kHz
Distortion: <.04% from 10 Hz to 20kHz @ 400 Watts
Gain: 26dB
POWER SUPPLY
Transformer Type: Multi-tap, multi-winding toroidal 80,000 μF
Power Filtering: 80,000 μF
Transformer Rating: 3,000VA
45 watts @ Standby (bias on)
to change bias you send the amp into the factory
the csib is warm but less so then the pass
the cods has great bass and Dynamics
it is made in Ca and is pricefd less the the other amps
Dave and Troy
audio intellect Nj
coda dealers