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Audio feedback loop
We just re-set up our edit bay. We are getting a bad feedback loop through the system. I have our betacam pvw-2800 audio patched directly into the AJA io via XLR audio cables. When both the inputs and the outputs are attachted to the AJA io we receive a terrible feedback loop. If I disconnect one set either the in or the out the loop goes away. How can we solve this so both the inputs and outputs can stay patched to the AJA io.
Jason Oshop
Senior Editor
SouthWest Post
Scottsdale, Arizona -
5 Replies
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Put a mixer in between your INs/OUTS of the IO. Pod up 1&2 for input, pod up 3&4 for output.
Andy
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You could use a patch bay to run the audio through. Then you can disconnect the input or out put depending upon what you are doing and eliminate the feedback loop. Since all outs are live on the IO when you digitize from the beta the audio signal is being fed back to the beta deck. Real bad, loud, ear piercing feedback will occur. A mixing board would work as well. You can mute channels accordingly…
Hope this helps,
Joel………………………………………………………………………………………….
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Andy and Joel are both correct – you can use a small mixer, you can use a patch bay. But if you want to spend zero money, you can simply drop the record levels on the front of the Beta machine all the way down, so it won’t feedback into the VTR. Only turn them up, when you want to dump back out to your VTR. But this is a sloppy way to work. Put a mixer in line, and you will have no more issues (but you have to know how to use a mixer – not hard, but it’s not brainless).
All audio and video products are prone to this – not just AJA. If you hooked up two VTRs to each other, or any 2 devices that can record to each other, you will get the same “feedback” effect. This is the nature of these products. You learn how to deal with it. The mixer is your cheap “correct” solution – but like I said – you can just drop your record levels on the VTR for right now, to get you going.
Bob Zelin
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Thanks guys!
We went with a route 4 soultion.
Jason
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Hello creative cow members,
This post is old, but it looks like a similar problem I have having. I have a digibeta deck going in and out of an AJA Kona LHI (final cut 7) via SDI. When I try to capture footage, the sound disappears and the video looks slightly distorted. When I disconnect the SDI cable going back into the digibeta, then everything is fine.
Being that I am using SDI, is the mixer still an option like it was suggested? Is it still OK to just turn down levels? I have a Big Knob going out of the kona independently for adjusted the speaker monitors. As always, thank you so much for your time and valuable insight.
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