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Digital Noise Problem
Hello All-
I’m hoping someone here can help me with a strange noise problem I’m having with my Pro Tools HD system. I’ve been a PT user for years and have never encountered anything like this. I thought the problem was an isolated one and my workaround worked at first, but the problem seems to be spreading. Here’s the basic system set-up that I have been using trouble-free since June 2006: ProTools 7.1 (I was on 7.0, but Digi recommended going to 7.1) Mac G5 PPC Dual 2.5 GHz OSX 10.4.6 1.5 GB DDR SDRAM OWC Mercury Elite Firewire drives (800 MB/sec) with Oxford chip set (2) 192 I/O with expansion cards for 24 in/24 out Clock Source: Internal Only DigiRack and Waves Platinum (5.4.5) plugs Delay compensation off when tracking No plug-ins apart from Click inserted while tracking Balanced power system for entire facility Here’s the story: 1. Working in a session with live drums chopped and looped into a one measure pattern, copied for an entire 4 minute song, and consolidated into single files for each track. There are eight tracks of drums for the loop, including stereo tracks for Room mics and Over Heads. 2. Added a new stereo audio track to overdub a piano. 3. Headphone cue mix of drums is routed through a PT Send to Analog 7-8 of 192 #1 to Furman HDS6. 4. Control Room mix routed to Analog 1-2 of 192 #1 to Trident console, then monitors. 5. Record enable piano track. 6. When rolling (recording or playback), a digital noise (crackle, similar to extreme cell phone interference or clock issue noise) is heard in the headphone cue mix, specifically on the send for the Kick Drum (out) track. 7. Here’s the interesting part: Reassign the Kick Drum (out) Send signal to any other pair of outputs, then reassign back to Analog 7-8. Noise disappears from Kick Drum (out) and appears in Send for Room Mics. 8. Reassign send of Room Mics to any other pair of outputs, then assign back to Analog 7-8. Noise disappears from Room Mics but reappears in Send for Kick Drum (out). 9. Save and close session. 10. Reopen session. 11. Noise still present. Something similar happened last week during a week of tracking sessions. 1. Working with 10-25 tracks of drums, percussion, bass, and guitar. Monitoring through Analog 1-2 on 192 #1. 2. Created a new track to record a vocal. 3. Record-enabled the track. The same noise mentioned above appeared. 4. Switched to all available inputs, noise still present. Disconnected all input connections to 192, noise still present. 5. Switch outputs to any other analog pair (noise disappears), then back to Analog 1-2, noise disappears. 6. Save session and close. 7. Reopen session. Repeat steps above. Noise present. Here’s what I’ve tried: Upgraded PT from 7.0 to 7.1 as recommended by Digi Upgraded to OSX 10.4.6 as recommended by Digi Disconnected all inputs to 192s Switched outputs for monitoring to all available outputs on both 192s (3 different DA cards) Reset all ribbon cables in 192s Ran tests with single 192 to eliminate loop issues between the 2 units Ran system on balanced and service power Launched sessions in question from different drives, including system drive Again, the noise goes away when I switch to another set of outputs then back to the originals. This has me thinking it's a software issue, not an hardware issue. Any ideas? I'd appreciate any thoughts. Thanks. Brian |
#2
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Re: Digital Noise Problem
You certainly did your homework before signing up to ask this question. Hopefully someone will know something beyond my meesly input (no pun intended).
I was recording last night... OK, first off, i always record through a spdif converter into my 888/24 and I clock to it. But last night.. I didnt feel like changing my clock on the external because I was doing some 48k video stuff and wasnt going to be doing much so i just switched the clock to Internal. I started recording without thinking.. I am hearing pops and thinking.. mic cable, etc.. I asked myself.. "did i change to internal?" i checked and yup, it's 48k internal.. wtf... oHHHHHHH I am using the a/d and my a/d isnt clocked off anything nor driving anything. Welcome to the DUC. |
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