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Hertz Frequencies & Knobs on a Bass Amp

Discussion in 'Amps and Cabs [BG]' started by pshep68, Nov 30, 2012.

  1. pshep68


    Sep 21, 2006
    I'm not even sure how to ask this question ... How do tell what position to turn the knobs on your amp to get to certain frequencies? For example ... What is 12:00 ... What is 3:00 ... what is 11:00? BTW I am using an Ampeg 3 Pro.
  2. two fingers

    two fingers Opinionated blowhard. But not mad about it. Gold Supporting Member

    Feb 7, 2005
    Eastern NC USA
    Here's a link to the manual for a 3 Pro. It has lots of frequency info in it.
    Here's what I like to do (after years of learning the hard way). Start off in every room kind of flat (and in your case without the graphic EQ engaged). Now, every amp will have a little bit of "color" to it when set to flat, but it's a good start. Dial in "your tone" for that room. Different stages and different rooms will sound different. The only caveat to that is if you are using PA support, be sure to check with the sound guy as well. He may need you to stray from "your tone" just a little if it's too muddy or too bright for the FOH mix.

    And in your case, after you have dialed in WITHOUT the graphic, then punch the graphic EQ button and set yourself a 2nd tone. That way you can use one tone for fingers and one tone for pick. Or you could use one tone for finger funk and another for slap. You get the idea.

    Short version. Don't get too caught up in the numbers. Use your ears. Boosting 300Hz means nothing if it sounds like crap.
  3. bodoger


    Feb 28, 2008
    Chapmanville, WV
    12:00, 3:00, 11:00 all refer to the numbers on an analog clock. eg... 12:00 = point knob straight up, 3:00 point knob to the right where the 3 would normally be on the clock and so on with the rest of the numbers.
    Also most knobs only move between the 7 and 5 o'clock positions.
  4. The "BRT" button boost the 2 Khz
    The "HI" button boost the 5 Khz
    the "LO" button boost the 40 hz and cuts the 500 Hz
    the "BASS" knob boost or cuts the 50 Hz
    the "Midrange" knob boost or cuts the selected frequency
    the "Frequency" knob is used to select the midrange
    1=220, 2=450, 3=800, 4=1.6k, 5=3k

    the "Treble" knob boost or cuts the 5 kHz