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View Full Version : Midrange notches of popular amps?


The Tone Snob
04-09-2008, 10:17 AM
I'm looking for more info such as this, which is from my Rivera's owners manual -
"Middle (with Pull Notch switch) The midrange circuit has a slight notch in the frequency spectrum at about 550 Hz, and turning the knob alters the depth of that notch. Its Pull Notch switch shifts the frequency center of that notch down to about 250 Hz. (For reference, most 1950s tweed amps have their notch centered at 550 Hz, while classic "blackface" amps have theirs centered at 250 Hz.) Experiment with this, especially if you're looking for a uniquely expressive rhythm texture.

I'd like to use said info with a parametric eq in conjunction with my Emery Superbaby amp in order to better zero in on different amp tones. Specifically Marshalls of different eras, AC30s, Hiwatts and Rectifiers. Additional frequencies for the highs and lows might be helpful too, if they're an integral part of an amp's tone. Any info would be highly appreciated, thanks! :dude

Blue Strat
04-09-2008, 10:37 AM
Check out Duncan's Tonestack Calculator (Google it).

This will give you the info you're looking for. You can insert tone stack values for any amp you can find a schematic of.