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odd output behaviour

Discussion in 'Recording' started by calidus, Feb 11, 2004.

  1. calidus

    calidus Guest

    Hi there
    please don't go "doh!" at me.....

    I'm A/B'ing to LDC's right now. (An ADK Model S and a SP B1)

    I made a few takes, vocal and speech, the first mic makes big healthy waves with the gain control set between 11 and 1 'o clock. Everything is fine.

    Then the other mic has a very low output, even at 3 'o clock, the waves are tiny, normalizing brings a lot of hiss upfront.

    What am I missing? At first I thought the -10db pad on the mic was engaged, but, dumb me, it has no pad, no switches at all.
     
  2. jonyoung

    jonyoung Well-Known Member

    Did you try swapping the mic cables? Could be a bad one (always look for the cheap fix first!).
     
  3. calidus

    calidus Guest

    riversedge> can't be the cable, 't was the same cable I just had used on the first mic.
     
  4. Kent L T

    Kent L T Active Member

    There is another post where a guy with an AT4040 is having a similar problem. A suggestion was made to check the phantom voltage to make sure it is putting out 48v. Some mikes can run on less others can't. If the voltage is low you will have problems. What are you plugging the mike into.
     
  5. calidus

    calidus Guest

    hi!

    the mic goes straight into my channel strip (M-Audio Tampa).

    As I wrote, the other one has an healthy output, anything between 30 and 40 db of gain will do it. On this one I really have to crank up the gain so the white noise comes in.
     
  6. David French

    David French Well-Known Member

    Let me guess... the ADK is the one with the low output. I looked at the sensitivity ratings on those mics, and the SP seems to be about 22dB more sensitive.
     
  7. AudioGaff

    AudioGaff Well-Known Member

    Your not missing anything other than a clue. It is perfectly normal for one type or brand of mic to be louder or need more gain than another. Welcome to the world of microphones...
     
  8. calidus

    calidus Guest

    David French> actually it's the other way. The ADK is the one with the "healthy" output.

    Audiogaff> Hmmm...not sure, as I wrote there's a huge difference. The B1 should be suited for vocals and acoustic guitars as well, but there's no way I get an useful track out of it, cuz either I crank the gain up or I keep it lower and normalize afterwards, a lot of hiss is what I get. Yet, I have mailed to PMI, maybe they can sort it out.
     
  9. David French

    David French Well-Known Member

    Nevermind, I read the stats wrong. :eek: On a second look, they are actually pretty close. I f i'm reading them right (the ADK stat is a little unclear), we have -34dBV for the B1 and -36.5 dBV for the ADK. This is how much gain that it takes to raise a standardized input to line level. Keep in mind there are other factors at play which keep us from making a solid judjement based on sensitivity figures alone, but usually they're good for a rough estimate. I have used a B1 before, and it didn't seem to need an unreasonable ammount of gain.
     
  10. jonyoung

    jonyoung Well-Known Member

    Must be something wrong with the capsule in the B1. Is it new? Has it ever been dropped? Hey, sometimes even new things don't work correctly!
     
  11. calidus

    calidus Guest

    David French> thanks for bothering. And I really liked the explanation; that negative value, what is it called? Sensitivity? I've never been too keen at specs....

    Riversedge> I got it new from the shop. Though it was the last one they got, I actually got it a little cheaper, so maybe someone at some point has dropped it.

    Thanks, once again
     
  12. AudioGaff

    AudioGaff Well-Known Member

    When you turn up the gain you will start to hear hiss. That is normal. Depending on the quality of which mic pre you are using, the type and amount of hiss or noise will vary. Cheap and crappy mic pre's will not be able to provide good clean gain at the higher levels some mics require. Some mics just don't play well with certain mic pre's.

    There could very well be something wrong with the mic. Take it to a tech or a music store and see if they will check it for you.
     
  13. jonyoung

    jonyoung Well-Known Member

    Calidus, Just curious where in Denmark you are, I've been there twice, the last time all over the country (but a long time ago). Hope to visit again someday.
     
  14. calidus

    calidus Guest

    AudioGaff, thank you for the advice, that's exactly what I'm gonna do! ;-)
     
  15. calidus

    calidus Guest

    OK? Twice? I've never been overseas, but to answer to your question, I live in Copenhagen. Was it for leisure or were you touring?
     
  16. jonyoung

    jonyoung Well-Known Member

    It was leisure. My father was an airline pilot and we travelled a lot. We have some Danish friends who moved the the US many years ago, and we took a vacation with them the last time I was there. My favorite place was Ebeltoft (spelling?). By the way, my favorite American pop artist plays Denmark often. Her name is Jonatha Brooke, she plays in Arhus most often. She makes terrific records! Check her out.
     
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