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frequencies

Discussion in 'Miscellaneous [BG]' started by wotnwhy, Jul 18, 2003.


  1. i know this has been answeared before, but i can't remember the answear, and i've searched and searched for threads and can't find any, so could someone answear this for me.

    what is the frequency of the low B of a bass?

    thanks

    Tom
     
  2. wulf

    wulf

    Apr 11, 2002
    Oxford, UK
    About 30Hz.

    Wulf
     
  3. moley

    moley

    Sep 5, 2002
    Hampshire, UK
    30.8677Hz, to 4dp.
     
  4. ok, this has all gone over my head, so, could you anwear me this.

    i'm looking at 2 cabs at the moment, their frequency responses are:
    -3db @ 56 Hz and 5 kHz
    and
    37Hz - 2kHz


    if the frequency of a low B is 30Hz, then am i right in thinking neither of these could handle it?

    Tom
     
  5. JMX

    JMX Vorsprung durch Technik

    Sep 4, 2000
    Cologne, Germany
    No. You can hear the low b pretty well on a cab like that (which one is it?)

    One of our resident techies will be able to explain it.
     
  6. the first rating is for the SWR 2x12 cab and the 2nd is for the ashdown MAG 115 200

    Tom
     
  7. Most of what we hear from the lower registers are the harmonics of the lower frequencies anyway. The cab that best handles my low B right now is my Eden D210XLT, and its specs are:

    +/- 2db 48hz to 14khz
     
  8. wulf

    wulf

    Apr 11, 2002
    Oxford, UK
    Taking moley's figure and making it an integer (for ease of calculation) gives 31Hz as the frequency of the fundamental of the B string. The sound you hear is made up of the fundamental and a series of overtones, which you can work out by multiplying the fundamental x2, x3, x4, etc).

    Therefore, your B string is also producing pitches of 62Hz, 93Hz, 124Hz, etc.

    Compare this to the same note, an octave higher, which will have a fundamental of 62Hz. There, the overtones will be 124Hz, 186Hz and 248Hz (etc).

    So, even if you run them through a system that kills anything below 80Hz, you'll still be able to tell them apart. In fact, the brain will 'fill in' the lower frequencies (psychoacoustics). Therefore, while a cabinet that reproduces the sound down to quite low frequencies is a good thing, you don't have to search until you find one that can do 30Hz with no problems.

    As in most issues about gear, the best solution is to take what you've got and try it with what you want (if you can ;) ), using your ears to judge if the result is suitable.

    Wulf
     
  9. Thor

    Thor Moderator Staff Member Gold Supporting Member

    For future reference, note this website on frequencies of musical notes.
    Source: Michigan Tech University Dept of Physics.

    One important thing to keep in mind, is that specifications, like statistics, can be stated
    in such a fashion as to portray the product in its best light. The frequency response curve is the measure of controlled response to known input. All speakers suffer a response loss at the low end of the frequency spectrum, seeing the curve gives a better idea of where and how much.

    And since all basses, pickups and so forth are different as well, the number of variables that come into play are high in making this choice.

    As musicians we do our homework, try to choose a range of the best possible products within a desired pricepoint [value] and take the bass you are going to use and hammer those amps until you are happy with it a choice. 3 step process, research, value judgement, in situ test.

    Given the underlying nature of your question, this should really be in the amp forum, where you would probably get more useful responses re the amps in question.

    Thor
     
  10. The difference between cabinets that produce a good fundamental 30Hz and one that doesn't is more about what you feel on your body (clothing/hair vibrating) than what can actually be heard.
     
  11. Petebass

    Petebass

    Dec 22, 2002
    QLD Australia
    Guys don't forget that speaker excursion increases rapidily once you start feeding it frequencies that are lower than the frequency the box is tuned to. If that Ashdown is saying the usable frequency range is 37Hz-2k, it's probably tuned to about 40Hz. So it is possible to get that B string to move that speaker so far it distorts, though you'd have to be trying pretty hard.........

    I think you should be OK provided you're careful. Note that the louder you play, and the more bottom end you add via EQ, the more this can be a problem.