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A-406 Subwoofer Amplifier mono 1 x 400 W / 2 Ohm
The A-406 meets or exceeds highest expectations and features the following improvements over the previous model:
1. AC induced hum and hum from connected components/equipment have been effectively eliminated.
2.
Any remaining hum is extremely low and inaudible,even without music signal, also with use
    of high efficiency speakers.