M3 'feedback' when playing along w/ CDs?

[Guest]

Hi all,</p>

I'm trying to understand some weird 'high pitched (?) feedback' from my M3:</p>

I am experiencing the weirdest thing with my M3: I put on some old Terry Riley '70's Hammond loop'ish (very nice: recommend it to all) CD into the CD player on my living room CD player.' </p>

I have the M3 out through a DI box, through a RT-20; that into the PA too (same PA that the CD player is playing through). As I turned the M3 on, with the volume pedal all off, I started to hear this high pitched sound - figured it was the Terry Riley CD, I turned down the CD player - same noise. </p>

Unplugging everything (making a long story short) I was left with the CD and the M3 (sans PA hookups): if I turned the CD up, I started to hear this high pitched sound - not bad, but it shouldn't be happening. Turn the CD off: no more of that sound.</p>

I put all of the drawbars off: sound stopped. Turns out, that if I have this CD playing and the second from the left brown drawbar for the upper keyboard is pulled out at all, then I hear that harmonic: no PA etc - just through the M3 speaker. Its as if that CD and the M3 are feeding back on that harmonic drawbar. </p>

Am I out of my mind? I put a metal window screen that was clip'd to ground ... sound still happened. I put a piece of card-board over the speaker of the M3 - weird sound stopped: its as if the song on the CD player is feeding back with the M3 tonewheels through the speaker? I'm playing with the PA very quietly, and again - this happens with the M3's volume pedal all the way down.
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Is such a thing possible? Is my M3 broken in some way?
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Thanks for any input.</p>

Malcolm
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[Guest]

Re: M3 'feedback' when playing along w/ CDs?



Just to clarify - the M3 doesn't make this sound when the CD player is turned off? i.e. that drawbar doesn't produce that harmonic at any time except when the CD player is playing? I had a drawbar once which sounded even when it looked like it was off - it needed an extra push to properly switch it off...

Otherwise all I can say is Hammond's are notorious for picking up an amplifying noise - that's what a tone generator's for after all! - and also digital audio is a terrible transmitter of noise - I've had CD players and especially computers which broadcast various noises over several feet - if it turns out to be that it can often be solved by putting ferrite beads on the leads of the computer/CD player...</p>

Turning the CD player on and off should narrow it down - often the hardest part of fixing an intermittent problem is to make it happen when you want it to!
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Good luck,</p>

Jesse</p>

[Guest]

Re: M3 'feedback' when playing along w/ CDs?



Hi - I realized tonight that its nothing to do w/ feedback; the organ makes sounds w/ the volume all the way off, and no notes being played (I reposted with that question), if the offending drawbar is pulled out (actually I have three drawbars doing this).</p>

If you have any ideas/comments, please respond to this, or the other more specific post/</p>

Thanks,</p>

Malcolm</p>