Re: Yamaha 6dB setting

Posted by Lew Veldas on December 05, 2003 at 00:59:28:

In Reply to: Yamaha 6dB setting posted by Bink on December 04, 2003 at 23:42:11:

: Details, please. What did you experience?

: You know, I wasn't planning on engaging any of the 6dB buttons on any of the DUTs even though I was going to include the cut-only mode on those that offered it. Maybe I should put 6dB on the test procedure!

: -Bink

You would expect when using a lot of boost or cut, that an EQ would run out of headroom sooner in the 12 dB mode - after all, adding 10 or 12 db is more likely to result in internal clipping than adding 5 or 6dB.

But these beasties can handle more lift and cut in the 12 db position.

I seem to remember investigating this on a couple of units with a scope and for a given input level, seeing some strange clipping near full boost and cut in the 6dB mode, which didn't happen in the 12 dB mode. There was no difference in performance when all faders were centred.
It appeared to be a design fault, though not having a circuit diagram I didn't investigate further.

Sadly I still get to use these things from time to time; a few of the smaller corporate events companies haven't got round to binning them yet although most of them seem to have filtered down through the used market, and ended up in rehearsal rooms. One product that I wish was not so well made and likely to last for ever.

Follow Ups:

• Re: Yamaha 6dB setting Bink 15:46:45 12/05/03 (3)
  • Re: Yamaha 6dB setting..thoughts on sample size John Roberts 16:26:54 12/05/03 (2)
    • Re: ...thoughts on sample size Bink 17:08:22 12/05/03 (1)
      • Apples and ??? Peder 00:09:22 12/07/03 (0)

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Comments:
: : Details, please. What did you experience?

: : You know, I wasn't planning on engaging any of the 6dB buttons on any of the DUTs even though I was going to include the cut-only mode on those that offered it. Maybe I should put 6dB on the test procedure! 

: : -Bink

: You would expect when using a lot of boost or cut, that an EQ would run out of headroom sooner in the 12 dB mode - after all, adding 10 or 12 db is more likely to result in internal clipping than adding 5 or 6dB.

: But these beasties can handle more lift and cut in the 12 db position.

: I seem to remember investigating this on a couple of units with a scope and for a given input level, seeing some strange clipping near full boost and cut in the 6dB mode, which didn't happen in the 12 dB mode. There was no difference in performance when all faders were centred.
: It appeared to be a design fault, though not having a circuit diagram I didn't investigate further.

: Sadly I still get to use these things from time to time; a few of the smaller corporate events companies haven't got round to binning them yet although most of them seem to have filtered down through the used market, and ended up in rehearsal rooms. One product that I wish was not so well made and likely to last for ever.



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