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RE: Output impedance of a DAC to input impedance of Power amp??????

Hi Tre', just to further add to what you also said for the interested readers.

That is why a 10K external passive pre is the way to go, never 100kohm. As you said worst a 10kohm will be is 2.5kohm output impedance.

Good interconnects these days are always less than <100pf (picofard) per foot. I always say keep them under 1.5mts long when I suggest use with my Lightspeed Attenuator which mimics a 10k passive pot, but say you have 2mts at 100pf per foot. That's approx 600pf of capacitance per channel.

This combined with the 2.5kohm ouput impedance of the 10k passive pot equates to a HF roll of -3db at 106khz!!!!!so there is far from any phase shift down into the audio band. Most amps can't reach this figure, let alone digital sources.

Cheers George



Edits: 08/11/14 08/11/14 08/11/14
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