Wyred4sound
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input impedance - 60Kohm unbalanced (tube pre-amp friendly)
stock Icepower module power supply
BC refXXXm series
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Input impedance - 100Kohm unbalanced, 200kohm balanced (very tube pre-amp friendly)
proprietary BC power supply module replaces power supply onboard the standard Icepower module
Other Amps (including all other non refXXm series BCs) using stock Icepower modules only
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input impedance - 10Kohm (not so tube friendly in general)
standard power supply onboard Icepower module