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In Reply to: RE: Looks like a mini version of mine.... posted by Dawnrazor on July 13, 2012 at 21:45:22
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
Follow Ups:
Any other way to resolve digital delay between Dacs besides using a distribution amplifier?
It would be very hard to sync up multiple dacs without one.
Dynobots Audio
Music is the Bridge between Heaven and Earth - 音楽は天国と地球のかけ橋
I believe the player software that I am using has the abiity to delay each individual channel separately, but not in the context of a digital crossover. I suspect there are other products that will do what you need, but not having faced the problem of synchronizing multiple DACs I can't offer any specific product recommendations.
I have faced the corresponding problem on recording, where a 4 channel recording was made using two separate two channel devices (running at different sample rates). I was able to synchronize the four channels so I could subsequently mix them down to stereo. (This was a bit of a nightmare, but the end result was satisfactory. It would have been good if the people who made the recordings had understood the problem they were creating and documented the exact position and distance of the microphones and instruments.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Hey T,
The crossover programs all have delay settings.
So if the dacs were identical would I still have the sync issues??
Afterwards we discovered faith; it's all you need
"So if the dacs were identical would I still have the sync issues?"
Most likely, no, once you found the best settings and assuming that the settings are sufficiently fine grained. If I were using a digital cross over I would go down this route and see how it works It will probably be fine, but I wouldn't be amazed if the synchronization didn't gradually drift out or vary from day to day.
Here is my version of Murphy's law, from the late 1970's: "If correct operation of a system requires that two clocks be synchronized, then the clocks will be unsynchronized. If correct operation of a system requires that two clocks not be synchronized, then the clocks will be synchronized."
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Hey Tony,
LOL. I like your version of Murphys law.
Afterwards we discovered faith; it's all you need
Surely other pro companies have multiple channel dacs as well....might be an option.
Dynobots Audio
Music is the Bridge between Heaven and Earth - 音楽は天国と地球のかけ橋
Edits: 07/15/12
Hey D,
I would probably go with the lynx AuroraFW.
But I am thinking about the fully digital amps. This might be the way to go and certainly makes things very simple and 2 less boxes. The challenge of synchronization would still be the same.
The prism is crazy expensive and the RME is priced right but I dont know about its drivers.
In the context of a cmp2 build where everything is minimized I dont know how rme will work. The Lynx drivers are fine.
Though for the same price I could get 2 wadias and probably get better sound?? or at least have a better resale if it came to it.
Afterwards we discovered faith; it's all you need
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