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HD Native/ HD IO gain/distortion issue. Help!
I will try to keep this short but include all pertinent data.
Mac Pro Late 2009 12 Core 3.46 Tried using both Snow Leopard with PT10 and High Sierra with PT Ultimate. DSubs are going into +4. We recently built a new desk and so therefore I had to change our patch bays around. We also upgraded our Pro Tools setup to Ultimate from 10HD. Before this, there were no issues. What's happening: inputs 1-8 seem to be clean and of a normal gain level. inputs 9-16 are low gain and have distortion but all match. Are there any software issues to check? Are there any known HD IO issues that might cause this? I of course am concerned that it is in a bank of 8 since those are the number of ins or outs on the interface itself. Got a big drum session on Friday so panic mode starts now... Help! |
#2
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Re: HD Native/ HD IO gain/distortion issue. Help!
Could it possibly be a bad Digilink cable?
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#3
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Re: HD Native/ HD IO gain/distortion issue. Help!
If you swap the cards from A to B and vice versa, does the problem follow?
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Janne What we do in life, echoes in eternity. |
#4
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Re: HD Native/ HD IO gain/distortion issue. Help!
No. The problem seems analog, not digital.
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#5
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Re: HD Native/ HD IO gain/distortion issue. Help!
^^^ yes. it’s likely either the AD cards or the cables feeding them (eg non balanced cables shorting pairs to ground etc.). Or maybe that group of preamp/preamp rack if coming from a single box/500 Rack etc. Swap the input cables (and so preamps attached to that) first. Crank up signal gen plugin to drive preamp or line inputs can make things lots easier to troubleshoot. Get out a multimeter and confirm the DB-25 cables are wired correctly/not wrong AES/EBU cables etc.
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#6
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Re: HD Native/ HD IO gain/distortion issue. Help!
Assuming this is an HD IO 16x16 analog? Open Setup>Hardware and verify that 9-16 inputs AND outputs are set to +4(or the same as 1-8). I would also try swapping the DB 25 connections to see if the problem follows the cable or remains with the IO(1-8 or 9-16).
Last thing(and really important), if you attempted(on purpose OR by mistake) to run UNbalanced signals, the manual states in bold letters that this will damage the unit if the cold side(the "-" of the balanced line) gets grounded(this could happen if you had DB25's routed to a 1/4" patchbay and connected with an unbalanced cable(TS instead of TRS).
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HP Z4 workstation, Mbox Studio https://www.facebook.com/search/top/...0sound%20works The better I drink, the more I mix BTW, my name is Dave, but most people call me.........................Dave |
#7
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Re: HD Native/ HD IO gain/distortion issue. Help!
Quote:
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Janne What we do in life, echoes in eternity. |
#8
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Re: HD Native/ HD IO gain/distortion issue. Help!
Good point, unless the failure affects at a root level, like power supply regulation. I've actually never known anyone that has done it, but thought it might be worth a mention anyway
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HP Z4 workstation, Mbox Studio https://www.facebook.com/search/top/...0sound%20works The better I drink, the more I mix BTW, my name is Dave, but most people call me.........................Dave |
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