Define Frequency Ranges for Lows, Lower Mids, Upper Mids, Highs???

Discussion in 'Amps and Cabs' started by dewman, Dec 26, 2007.

  1. dewman

    dewman Gold Supporting Member

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    Can someone post a frequency range for the spectrum of lows, mids and highs that could help me find appropriate breakpoints to define lower mids from upper mids in Hz or kHz. Just expermenting with an amp voicing and want to have some sort of quantitative ranges of frequencies so I can see how changing caps affects mids and the ability of the amp to have sweetened highs and appropriate mids o cut through and a bigbottom end. Any useful descriptions of low end and the relationship to the frequency spectrum typically occupied by bass and keyboards are also helpful! Thanks-
     
  2. stratovarius

    stratovarius Supporting Member

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    I'm skeptical that you'll get definitive answers. It's just too relative. Consider that highs on a guitar amp are really mids in the audio world.
     
  3. dewman

    dewman Gold Supporting Member

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    Well that being said, and that's a fair criticism, even relative ranges would be helpful. Again I'd like to focus on guitar frequency ranges.
     
  4. Mickey Shane

    Mickey Shane apolitical Silver Supporting Member

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    A standard tuned 6 string should go from 80Hz to 6KHz. Dividing by 4 gives 1480Hz per section. It's rough, but workable.

    Lows = 80Hz - 1.5K

    Low mids = 1.5K - 3K

    Upper mids = 3K - 4.5K

    Highs = 4.5K - 6K

    All linear.
     
  5. GAT

    GAT Gold Supporting Member

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    I think this is a real good question as I always "hear" music and instruments as frequencies. Must be my soundman ear!

    Ultra lows: 20-80
    Lows: 80-200
    Low mids: 200-500
    Mids: 500-1.4
    High mids: 1.4-2.5
    Highs: 2.5-4
    Ultra highs: 4-20

    Of course, they all interact with each other. Ultra highs add "air" to the sound, low mids can add mud or girth depending on the mix.

    Anyway, that's my take on it. Happy Holidays Dewman!!
     
  6. Ricker

    Ricker Member

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    I like these ranges............I think they are spot on.
    You'd be hard pressed to argue these values.

    The upper mids are the most argued and misinterpreted in guitar land.
    Alot will describe these as highs but technically they are not.
    V30s have alot of these upper mids but have rolled off highs .....................
    And so the technically incorrect will say they have too much treble............
    But the technically correct will say they have rolled off treble.

    Yup
    Rick
     
  7. Norjef

    Norjef Member

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    Gittarilly speaking--lows 80-160
    low/mids 160-400
    mids 400-1500 (love Ampeg rocker-switches)
    upper mids 1500-3000
    trebles 3000-5000
    presence above 5000
     
  8. imjustadrummer

    imjustadrummer Member

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    check out these graphs from Ted Weber that was posted to a thread of mine on the EVM12L by malabarmusic...
    interesting to see where EADGBE fall on the Hz chart and the rest of the "speaker characteristic" above that...

    Courtesy of Ted Weber:

    EVM

    [​IMG]

    V30

    [​IMG]

    Greenback

    [​IMG]


    Blue

    [​IMG]


    Ted's data suggest that calling the EVM "flat" would be a stretch. To be sure, it would make a lousy PA speaker!

    Interesting to compare the visual peaks and valleys and see how they jibe with what we hear.

    - DB​
     
  9. Tommy_G

    Tommy_G Member

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    The Traditional Boogie Graphic EQ is interesting...

    Slider 1: 80 (Bass?)
    Slider 2: 240 (Low Mids?)
    Slider 3: 750 (Upper Mids?)
    Slider 4: 2200 (Treble?)
    Slider 5: 6600 (Presence?)

    Note that there is approximately 3x (octaves) between adjacent frequencies.
     
  10. Ricker

    Ricker Member

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    It's cute ...but it's wrong... ;-)
     
  11. Roccaforte Amps

    Roccaforte Amps Member

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    Knowing the frequencies of bass and keyboards
    is only usefull here if you're mixing a recording....
    If you're going to be experimenting by trying
    different part values how is knowing
    these frequencies going to help you?

    For "sweetened highs" it's not a matter
    of how much trebble you hold back
    or let through, it's how the whole
    circuit amplifies it.
    I think your best bet is to try different
    part values and listen to the changes.
    Guitar amplifiers are not about "calculators"
    and "blueprints", they're about tone
    made from a person who tried different
    things until it produced the desired sound.
    That's how we do it.
     
  12. John Phillips

    John Phillips Member

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    That's exactly how I think of it too - although I'd call the 'mid-bass' lower mid.

    Exactly.

    But not that far off... if you replace 'upper mids' with mids, 'treble' with upper mids, and 'presence' with treble.

    I find that Mesa EQ to be very musically useful too, exactly because it does fit with the 'ranges' I tend to think about.
     
  13. killer blues

    killer blues Member

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    ++++1 mr roccaforte
     
  14. GTRJohnny

    GTRJohnny Member

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    +1. For guitar, I think these values are pretty close...
     

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