LUXMAN C0-6a 

The low-impedance end outputs remained the same : positive phase (4x rca + 2x xlr) and negative phase (2x rca) ; their impedance was maintained at 16 and 8 Ohm ! These multi-outputs were mainly meant to power a pair of M-06 or M-07 as monoblocks. Pricey, but well worth the expense.

Also added were more secondary windings to supply independently the 34 relays and front LEDs, complete chassis copper-plating, better RCA terminals, 6N wiring and, as for the M-06 vs. M-06a, a fair amount of hand-applied copper shielding atop the caps.

The Ultimate Attenuator wasn't touched : same 4-gang fixed-resistor box, as used in all late-Alpine & Azden periods : 4x 32 resistors soldered on glass-epoxy PCBs with non-magnetic wiring and enclosed in a diecast enclosure.

According to the published specs, there's a 0,003% increase in distortion