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Please explain how Marshall's presence control works

 
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analogsystem
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Joined: 14 Jan 2008
Posts: 214
Location: Seattle

PostPosted: Thu Feb 25, 2010 5:42 pm    Post subject: Please explain how Marshall's presence control works Reply with quote

I know this should be in the Marshall FAQ but I thought it might be more likely to be noticed here:

I know Marshall's presence control (on lets say a 2203/4 head) controls the negative feedback loop. Can someone please dumb the process down and explain how this works and effects the sound?

I always thought of the presence as the "sparkle" above the treble knob, but now I am hearing more complexity in what it does. Maybe my ears are just getting better (or worse) but I feel like the presence knob actually adds some sparkle and also takes out some upper mids somewhere....its definitely a well named knob as it seems to add presence in the mix, just as it should. I have basically left this knob on 5 for the last 6 years (why?) and have just now decided to turn it up some more....diggin' the sound but wondering about the technical aspects.

I have a general idea of how a passive tone stack works in the amp.....but the negative feedback loop thing is a bit over my head. Any help with understanding this would be great!!!

Also "Presence" is the best Zeppelin album so you know there is something going on there Wink

thanks!!
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Mike
I like EL34s


Joined: 20 Apr 2006
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Location: Edinburgh, Scotland

PostPosted: Thu Feb 25, 2010 6:26 pm    Post subject: Reply with quote

Some great knowledge here, put better than I could explain it
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