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#1
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HD I/O - ch 1&2 out of phase with ch. 3-14
While calibrating a system yesterday and running a 1k tone through all 16 channels of an HD I/O I discovered ch A1 & A2 are slightly out of phase with the other 14 channels. See attached images for reference.
We ran the same test tone through all 16 channels. Patched the output of each channel directly into the same channel's input and recorded signal to check for phase coherency. Is there some internal mix buss voodoo with Pro Tools and Ch 1-2 since those are usually reserved for master bus / monitoring? Is there any other reason that would explain why the first two channels are out of phase with the remaining fourteen? System Specs: MacBook Pro M1 running PT Ultimate v23.12.138 via HDX card in Sonnet Echo III Thunderbolt Chasis connected to AVID HD I/O with 16 analog ins/outs. Test session was using AVID's own "HD IO Calibration Session (16 ch). If image does not appear you can also view here. If image does not appear you can also view here.
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MBP M1 Max | 64 GB | 4TB | macOS Monterey Version 12.7.4 [Legacy] Mobile: MBP Retina 2.6 HGz Intel Core i7 w 16 GB 1600 MHz DDR3 running macOS Catalina (10.15.7) w/ Pro Tools Ultimate 2020.12 [Legacy System] Studio: Mac Pro 2 x 2.93 GHz Quad-Core Intel Xeon w 16 GB 1066 MHz DDR3 RAM running OS X 10.8.5 using Pro Tools v10.3.9 & v11.3.2 HDX w/ AVID HD I/O |
#2
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Re: HD I/O - ch 1&2 out of phase with ch. 3-14
Quote:
I saw your support case and I've bumped it up the team. Thanks! (Case 04763809)
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-Tope To create a support case with Avid Support, go to https://www.avid.com/learn-and-suppo...-music-support www.topedomingo.com |
#3
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Re: HD I/O - ch 1&2 out of phase with ch. 3-14
Dear God. Gremlins. Following.
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#4
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Re: HD I/O - ch 1&2 out of phase with ch. 3-14
Send 1-2 out to 3-4 in and send 3-4 out to 1-2 in. See which channels are delayed then (on return)
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Pro Tools Ult 2024.3.1, HDX 2, MTRX/SPQ, RME BBF Pro + MADIface Pro • S1 x 2, Fire Max11 x 2, Dock, iPad Air5 • Mac Mini 14,12, 12 core, macOS 13.6.6 • RAM 32GB, SSD 4TB, GPU 19 core • QNAP TVS-872XT 148TB TB3 |
#5
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Re: HD I/O - ch 1&2 out of phase with ch. 3-14
do you happen to have master outs for 1-2 and not for the others in your session?
are you using a printed sine wave or the "signal generator" plugin? I would strongly recommend to use the latter in case you are using a plugin. |
#6
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Re: HD I/O - ch 1&2 out of phase with ch. 3-14
While it's not impossible that this is a bug, I'm curious if there's a patch bay involved with half-normals and there's any loading on 1 and 2 that's not on the rest of the outputs, or were the outs and ins completely lifted from anything else in the outside world when patching out to in?
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http://www.richbreen.com ---------------------------------------- Mac Studio / Ventura, PT 2023.12.HDX, Avid HD I/Os and Metric Halo ULN8, 3xS1/Dock Also running a Mac Studio Ultra / Ventura / HDX / MTRX / S6 |
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