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What is it? ???

Discussion in 'Recording' started by vinniesrs, Jun 25, 2003.

  1. vinniesrs

    vinniesrs Active Member

    Okay, so I just noticed while mixing, that my woofers were moving very noticibly, and very slowly while playing back. I found the culprit to be the snare track. Once I put in a hpf at 75hz, no more prob. I have also noticed the same issue with the bass.

    What is the cause?

    It would make sense to me that there are high level subharmonics there. If this is the case, what caused them?

    If not, what caused them, and how do I prevent it?

    I can't figure this one out on my own.

    Steve
     
  2. mike buzz

    mike buzz Guest

    Steve theres a DC component in your output !!! , direct current will cause this , some digital mixers and recorders will build up a DC offset that can cause this ( I thought most dc offsets were static not varying ??? might be wrong )
    I dont know what may have caused this to happen in the first place possibly some dc leakage from some source in the signal chain when recording , did you use the same device on these tracks ???

    Hope this helps
    Later
    Buzz
     
  3. vinniesrs

    vinniesrs Active Member

    the thought had also crossed my mind about dc, when I put the hpf in the chain. Is seems to only be on the snare, and the bass. I routinely mic snare top and bottom, but it still occurs occasionally, and on different channels. What are some ways to fing the culprit. Could it be ad conversion on my adats?
     
  4. realdynamix

    realdynamix Well-Known Member

    :) Hey Steve, do an experiment where you hook everything up, mics and all, set levels and roll with out making sounds. Then, look for a signal on a spectrum analyzer. That slow movement could be a DC peak of a very large wave, or it could be a bad cap in the phantom, mic pre, input strip, any number of places. Or even a subsonic vibration. You have to track it down item for item. Also make sure there are no other influences, like an open channel, or generator, midi note, or something from your software.

    Good luck!

    --Rick
     
  5. vinniesrs

    vinniesrs Active Member

    Ha HA! I have just learned that there is a steel foundry 1/4 mile down the street. There are really big machines there, I think the is what the mic's are hearing.
     
  6. realdynamix

    realdynamix Well-Known Member

    :) Put the base of your mic stand on a pillow(s), and see if it goes away.

    --Rick
     
  7. vinniesrs

    vinniesrs Active Member

    Good idea Rick! I have to wonder if it would work because the mic I used to test this, was a c-414 in a shock mount. I will try a foam pad for non isolated mic's as I think this will look a little better and accomplish the same function.

    Thanks, and hope your holiday is going well! canada just had our independance celebration on the 1st!
     
  8. sheet

    sheet Well-Known Member

    If you have a tri-pod stand, take a roll of toilet paper and put one on each leg. I had some made out os a low-memory, heat and chemical resistant foam material. They work great.
     
  9. vinniesrs

    vinniesrs Active Member

    thanks sheet. Ido have tri-pods,but they stay with the live rig,as i find they take up too much floor in my small studio. Great idea!
     
  10. realdynamix

    realdynamix Well-Known Member

    ...And you never run out of paper when you need to....awwww Sheet, LOL!!! Couldn't help myself LOL!!! :D :D

    --Rick
     
  11. detlof

    detlof Guest

    Steve, if it was the steel foundry, why did you only get it on snare and bass?
    Jonas
     
  12. vinniesrs

    vinniesrs Active Member

    Jonas. I have only one response to that:
    :D :D
    You point out the most painfully obvious thing, and now I have to start over!
    Thanks! I feel dumb for not even having thought of that, but I haven't spent a lot of time on it either. When I do, and when I solve the problem, I will update this thread and let you all know!
     

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