Actually, I designed the original mono Siliconray chassis first, then this stereo chassis. Since the stereo chassis arrived, IIRC I never sold another regular mono amp again, except these BTL mono in the stereo chassis.
Thanks for the note. I built dozens of NC400, constantly modifying my record of the length of each wire up/down in 5mm steps, for just enough slack but no more than necessary. The main wire harness takes longer to make than any other single task.
If anyone employs NC400 w/system having 13.4 dB or more spare gain, remove R141 on NC400 for even lower noise floor. (Stock gain is 25.5 dB w/R141 installed, 12.1 dB w/R141 removed.)