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Phasy feed back when making mastering loop Audio Interfaces
Old 15th December 2010
  #1
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Phasy feed back when making mastering loop

This may be kind of a noob question but I am trying to use outboard gear for lite mastering and I am getting this terrible feedback phasy kinda sound. I looked for a forum on this but couldnt find one. My setup is an apogee duet/ensemble depending on location and both have the same problem.

I took out all extra gear and did a straight loop from the L/R outs to inputs 1 and 2. I have to use the instrument inputs (DI's) on the duet and there is no way to bypass the pres on those to my knowledge but I am pretty sure I had the same problem with the ensemble last time i tried it.

If i dont use a pre of some sort i dont get near enough level so im a little stumped. Anyways there is a sound clip at the bottom...any help is greatly appreciated thanks!!!

And yes I have swapped cables...
Attached Files
File Type: aif test fback.aif (1.68 MB, 116 views)
Old 15th December 2010
  #2
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John Moran's Avatar
 

Verified Member
you need 2 separate D/A and one A/D to set up the loop.

1 D/A feeds the analog chain, the A/D captures the processed signal and the 2nd D/A is your monitor.

i don't think the duet alone is capable of that; the ensemble should be if you have your signal routing properly set up.
Old 15th December 2010
  #3
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Quote:
Originally Posted by John Moran View Post
you need 2 separate D/A and one A/D to set up the loop.

1 D/A feeds the analog chain, the A/D captures the processed signal and the 2nd D/A is your monitor.

i don't think the duet alone is capable of that; the ensemble should be if you have your signal routing properly set up.
To add to this:

If you only have 1 D/A, that single D/A will be handling both the post analog and the pre-analog. Since the post is a few ms forward in time, it's combination with the pre creates a phasey sound. Since the pre adds with the post and goes back through analog world again, that build-up creates a feedback.

So that's why you are hearing phasey feedback.
Old 15th December 2010
  #4
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OK thanks guys that answers it. Ill probably just ditch the duet then and stick with the ensemble...or maybe ditch both and get a new symphony
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