Re: [Harp-L] Re: controlling amp feedback

["Splash" <celtiac@xxxxxxxxxxxxx>]

I use a Behringer Feedback Destroyer Pro on the PA system doing sound at
small venues.  They're getting less expensive these days. [$100-$125 street]
It's not a compact enough unit for a gigging harp player with a small amp
and bullet mic who likes to travel light.  But they do work well.  Very
quick response, and they're automatic.

I've been spoiled.  I don't want to work the sound board without it anymore.
Some people complain about a whine in the reviews, but I haven't noticed it
doing live sound.  Maybe in the studio you would hear it.  If I had a
studio, I'd probably get a more expensive unit.

I did a quick google and see they have a small compact unit, that also has a
delay and compressor.  Might be just what the Dr. ordered.
http://www.zzounds.com/item--BEHDSP110

PEACE
Scott
Believe in Magic!
----- Original Message -----
From: "Dave Murray" <dmurray777@xxxxxxx>
To: <harp-l@xxxxxxxxxx>
Sent: Saturday, July 07, 2007 8:07 PM
Subject: Re: [Harp-L] Re: controlling amp feedback


> Frank Evers wrote:
> >.Am Samstag, 7. Juli 2007 schrieb Peter and Connie Ruth:
> >> One way to control amp feedback is to put a Graphic EQ in between
> >> the mcrophone and the amp.  This way you can decrease the
> >> frequencies that feed back before they are amplified.
> >
> >I don´t second this, swapping tubes at least V1 and probably also V2
> >is worth a try. V3 hosts phase inversion, changing it might require
> >closer inspection.
>
> Well, I don't see why not. Peter's statement was a true. If you attenuate
> the frequencies that cause oscillation (feedback) you can have a higher
> overall output without feedback. True enough, you can do tube swaps
without
> changing bias networks to give an amplifier a different gain curve which
> "can" reduce feedback along with changing other gain characteristics. But
> attenuating the offending frequencies that cause an amplifier to break
into
> oscillation goes directly to the heart of the matter without degrading
other
> aspects of amplifier performance.
>
> If you like some other method better, that's fine for you, but please
don't
> try to give people the impression that selective frequency attenuation is
> not a valid method for fighting feedback, because it is. If I
misunderstood
> "I don´t second this", never mind.
>
> Peace and music,
> Dave
>
>
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