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Topic: Revelation Preamp users - Color control |
Brad Sarno
From:
St. Louis, MO USA
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Posted 25 Feb 2008 1:48 pm |
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I had stated before that to get the Rev to voice like a Twin, that the Color knob should be on about 5 (straight up), but really that knob should point to 3 to get a true Fender Twin type mid dip frequency. Really you should turn that knob to where you like it, but if you want to know how they compare, Color on 3 is the true classic setting as if the Color knob didn't exist at all.
Brad |
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Jonathan Cullifer
From:
Gallatin, TN
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Posted 25 Feb 2008 2:08 pm
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| Does the Color knob control the mid frequency or the high frequency? |
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Brad Sarno
From:
St. Louis, MO USA
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Posted 25 Feb 2008 2:29 pm
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It's really not that simple. The passive tone-stack type of circuit that we're dealing with creates a curve that is a bass boost, a midrange dip, and a treble boost. This is what 99% of all guitar amps are pretty much doing. Even on a flat EQ type amp like a Peavey Nashville, players generally are dipping with the swept mid control.
So that being said, if you can picture this mid-dipped curve on a typical amp like a Twin, there is one way to control the frequency of the dip, and that's with the Treble control. This is where the term "interactive" gets used. When you turn up the Treble on a Marshall or Fender amp, you are not only adding treble, but by the nature of that passive circuit, you are also shifting the center frequency of the midrange dip downward. I think a lot of what people are doing when dialing in a tone on a classic Fender amp is turning the treble knob not so much for treble, but more for dialing in the correct midrange. It's kind of both going on at once. The Color knob on the Rev or Tonic is sort of an over-ride control. It directly controls the frequency of the midrange dip. That way you can dial in the right amount of treble, and then further tweak the midrange dip (voicing) to exactly the frequency that sounds best.
So basically the "color" control is a "midrange dip frequency" control. There's always a dip there. The "midrange" control on these kinds of EQ's is a broad and general control over how deep the mid dip is. If you crank the Midrange on a Rev or Twin, you approach flat, but never really get a mid boost. You'd really have to turn the bass and treble down to around 1 or 2 to even approach something flat or mid-boosted. So we're dealing with a curve with a dipped mid. The tone controls will tweak the shape, tilt, and placement of that curve.
Brad |
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Larry Hamilton
From:
Amarillo,Tx
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Posted 26 Feb 2008 8:13 pm
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And to think that all years I have just been twisting knobs until it sounded good. Wow 
_________________
Keep pickin', Larry |
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Jay Ganz
From:
Out Behind The Barn
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Posted 26 Feb 2008 9:45 pm
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| So, it's sorta like replacing the slope resistor in a Twin with a variable control...right? |
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Brad Sarno
From:
St. Louis, MO USA
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Posted 26 Feb 2008 10:10 pm
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| Jay Ganz wrote: |
| So, it's sorta like replacing the slope resistor in a Twin with a variable control...right? |
Quite a bit like that. But it's not entirely that simple.
Brad |
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