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Post by scumbum on Nov 15, 2014 11:52:14 GMT -6
Thanks for the info and help guys in squashing this myth and figuring out the flaws in the test .
Once last thing though can you explain .
How come I can play audio from Pro Tools through optical and record to ADAT tape , then play that ADAT tape and record back through optical into Pro Tools and get a perfect audio transfer that nulls in PT , and this is with the ADAT as Master clock .
Doesn't that mean with the optical connection theres no clocking issue between the two ?
Thats where this whole original test started from . I can get a perfect digital audio transfer back and forth between the two devices .
So why does the "clocking issue" show up with the second test and not the first one as well ??
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Post by scumbum on Nov 15, 2014 12:26:11 GMT -6
Do you know what level the 002 is calibrated for as zero? I'm curious, because AI maintain that ALL ADCs are non linear....the better ones just have a much wider dynamic window of sounding good. But, fed the level they're designed for....they're mostly interchangeable. I found this info , "All Digi 002 and Digi 002 Rack audio inputs and outputs are set for 14 dB of headroom below 0 dB, or full code. This means at the nominal reference input level (+4 dBu or –10 dBV) you can have up to 14 dB of headroom before input or output clipping occurs. The maximum input and output of Digi 002 or Digi 002 Rack using balanced TRS cables on any of the +4 dBu, 1/4-inch connectors is +18 dBu (6.15 Vrms)." |
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Post by popmann on Nov 15, 2014 12:54:16 GMT -6
So, 0=roughly -18dbfs. That's where you steady state peak levels should be....which is different than a momentary occasional peak....right? Hitting a snare drum--the 2 and 4 should be peaking around -18, with it understood that end of the day, you're gonna end up with some fills and particularly heavy hits peaking above. Right?
Reclocking....a digital clock doesn't just run conversion duties....your software needs the clock for anything it does....which the stability of that is subject to Firewire chip/OS/Driver....thus playing single stereo file stream back....isn't the same as 6-8 streams being played back.
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Post by scumbum on Nov 15, 2014 13:06:29 GMT -6
So, 0=roughly -18dbfs. That's where you steady state peak levels should be....which is different than a momentary occasional peak....right? Hitting a snare drum--the 2 and 4 should be peaking around -18, with it understood that end of the day, you're gonna end up with some fills and particularly heavy hits peaking above. Right? Reclocking....a digital clock doesn't just run conversion duties....your software needs the clock for anything it does....which the stability of that is subject to Firewire chip/OS/Driver....thus playing single stereo file stream back....isn't the same as 6-8 streams being played back. Awesome , thanks ! I've learned a lot . |
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