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Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

RE: Looks like a mini version of mine....

The comments below speak to using multiple DACs in digital crossover applications. With multiple DACs there is a possibility that the time delay out of the separate DACs may differ.

If there is a fixed delay through the different channels, you will be able to see that by capturing the output, e.g. by using a measurement microphone. If the software crossover has delay compensation because it is working on impulse response then there will be no problem, no matter how the delays work out so long as they are consistent, because the delay compensation in the digital crossover can be adjusted appropriately.

If there are variable delays, then all bets are off. It is possible that the delays might vary from time to time or might be different each time the system is powered up. (I am not saying it is likely, but it does seem possible, at least with some software and hardware.) If this happens then the sound will be incorrect, ranging from imperceptibly degraded to absurd. Therefore I suggest that running some tests to verify that this isn't happening, e.g. measure the impulse response at the listening position from time to time during a long session and measure the impulse response at power up for a number of days. Of course, this paranoia won't be necessary if there is consistently consistently good sound. :-)

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

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