Wisdom Audio SA-2 Power Amplifier 500-700 The 801 D4 Signature is

The 801 D4 Signature is an optimized version of B&W's most advanced loudspeaker

for reproducing all music as it really sounds

and plug in your favorite headphones

The cartridge’s MicroLine® stylus allows it to trace the record groove with incredible accuracy

Wisdom Audio SA-2 Power Amplifier 500-700 The 801 D4 Signature isWhile many contemporary amplifiers waste 50% or more of the power they pull from the wall as heat, the SA series amplifiers run at approximately 90% efficiency. As a result, more power is available for the loudspeaker, and less is wasted as heat in your room. The high efficiency of the SA series design also means that the amplifiers can be placed in close proximity to each other, as in an equipment rack, without undue overheating.