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Post subject: Hot Rod Deluxe Presence knob
Posted: Wed Jun 16, 2010 9:49 am
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Hobbyist
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Joined: Thu Dec 18, 2008 11:10 pm
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Location: Planet Hell
Am curious, I have no idea what the presence knob is for. I don't notice that much of a change when I turn it up/down. Is there a certain setting of the other controls that will make the presence knob actually make a difference in the sound? In short, what am I doing wrong?

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Posted: Wed Jun 16, 2010 12:52 pm
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Aspiring Musician
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The presence in Hot Rod is a kind of low pass filter located at the Long Tail common cathode circuit (dephaser) of the power stage that plays a role on the feedback from the speaker(s).

It doesn't change the bias but the bandwith and can eliminate the feedback. I control distortion and headroom ...

Using other words, you have "more or less" high end treeble on the power stage. :wink:

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