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About playing bass thru guitar cab. My final words on the matter.

Discussion in 'Amps and Cabs [BG]' started by Dreadneck, Jun 29, 2020.


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  1. Dreadneck

    Dreadneck

    Jun 29, 2020
    Sweden
    Hi everyone!

    This is my first post here and a sort of introduction as well i guess.

    I've been visiting this (and others) forum for a long time now and what finally got me to sign up was the topic concerning playing bass guitar through a guitar cab.

    This has been discussed A LOT, probably since the guitar and bass amps were invented and it allways sparks feuds and debate.
    Now I just felt like doing my part in hopefully bring clarity to this matter from a more theoretical point of view.
    I will not delve into the matter of playing bass through a guitar amp. That is a matter that is very dependent on what amp you use. No this is about cabs and speakers.

    Ofcourse you CAN play your bass through either a guitar or bass amp into a guitar cab. It might even in the best circumstances sound great!

    However..
    Bass and guitar operate in different spans of frequencies. With a guitar you are rarely going below Hz in the lower 100s.
    Bass on the other hand has a lot of power below these frequencies. This is where you find that warm and pumping sub bass that is so essencial to bass.
    Naturally the amps and cabs are made to handle the frequence span of the respective instrument.

    So if we agree that the bass guitar has most of its power and value in the lower 2 and 3 digit frequencies we can take a look at sound waves, which a speaker produces in large amounts.

    A sound wave is built by sine waves in different dynamics and for a sine wave to be complete (and therefore audible), it has to travel a certain distance.
    Ex. a sine wave at 20Hz (which is the lowest limit of human hearing) has to travel 17 meters/55.7 feet, to become audible.

    A 100 Hz sine wave only has to travel 4 meters/13 feet to be complete.

    Now, bass guitars and bass amps are made to put out very low frequencies at high volume.
    This means that the speaker has to deal with both the volume and frequencies produced.
    The lower the frequence, the harder it is to percieve. This is why bass amps often has much more wattage than guitar amps. Simply to be able to produce low frequencies louder. And to do that, the speakers has to be able to move air a long distance and the longer the distance the more possibility for movement the speaker needs.
    A speaker designed for guitar does not have the in/out movement needed to produce such low frequencies. It has a tighter move span which makes it a lot more suitable for midrange and the lower parts of high frequencies.
    The amp does not know or care if the speakers can't take the presure, it amplifies what you put into it.
    And when a solid 150dB 80Hz wave hits a guitar speaker, the speaker max out and stops short.
    In the worst case the rubber bearings crack and the speaker moves no more. Or if it doesn't crack, the paper membrane continues forward when the speaker stops. This will destroy the membrane and quite possibly the coil as well.
    Bare in mind that if the speaker only had to stop the membrane when maxed out, it would be fine. But when the heavy magnet is moved, it takes a lot to stop it.

    The speaker could in best case experience speaker exhaustion, which means the rubber bearing has been stretched and temporarily looses elasticity which would make it sound dull or perhaps go quiet. The speaker will recover from this a couple of times, but not much more.



    What about octave pedals?
    This is possible because the fact that the guitar amp does not amplify those frequencies the same way a bass amp does. They are pretty weak and lack the power that a bass guitar and amp would have.
    If you play guitar with an octave pedal though a bass amp and guitar cab however, it would be a completely different story.
    But the fact is that a bass string produce lots of harmonics that a guitar string doesn't, octave pedal or not. It really can't be compared.



    Well this was what I had to say about this subject.
    Hopefully this will answer some questions and/or confirm an allready worn out subject.

    Best regards/ Philip
     
    BOOG likes this.
  2. seamonkey

    seamonkey

    Aug 6, 2004
    TL;DR
    Low E string on a guitar is 82.41hz, 7 string guitars go down to 61.74hz

    Not at all. Headphones work.
     
  3. jeff62

    jeff62 Supporting Member

    Oct 24, 2005
    Orlando, FL
    That’s the first post? An authoritative lecture? :roflmao:

    The dude has cojones!
     
  4. I suppose this means there will be no further posts from you in this thread :smug:
     
  5. Razman

    Razman Supporting Member

    Feb 10, 2005
    Orange Park, FL
    Welcome to TB! IMO, so long as one doesn't under-power the cab it will be fine (so saith many here). :whistle:
     
  6. that's completely wrong. Either you got it from someone with no science or you made it up.

    Sound wave of a given frequency ( any frequency you like) passes a point in a medium [here we use air] at the speed of sound in that medium, compression increases to maximum amplitude and reduces past nil to become a rarefraction. It is fully complete as it leaves the speaker.
     
  7. bholder

    bholder Affable Sociopath Supporting Member

    Sep 2, 2001
    Vestal, NY
    Received a gift from Sire* (see sig)
    Take a course in Physics or Acoustics before posting stuff like this, please. An "allready worn out subject" doesn't need more confusion.
     
    Jeff Scott, Iristone, Loring and 26 others like this.
  8. underwhelmist

    underwhelmist

    Nov 16, 2018
    UK
    I need to be able to hear myself when playing. Where can I buy a 17 metre guitar lead?
     
    Jeff Scott, rzamites, Loring and 36 others like this.
  9. jeff62

    jeff62 Supporting Member

    Oct 24, 2005
    Orlando, FL
    If you haven’t figured it out by now, this clearly must be :spam: (or an outright troll).

    :roflmao:
     
    Jeff Scott, Loring, TinyE and 4 others like this.
  10. knumbskull

    knumbskull

    Jul 28, 2007
    UK
    those are the fundamental frequencies of the low guitar string. I doubt very much that most guitarists would have much use for them unless their tone was purposefully very bassy!
     
  11. Samatza

    Samatza

    Apr 15, 2019
    Whaaaat? If it's been done to death already the least you can do is get the facts right, now it's only going to get done to death again!
     
  12. lfmn16

    lfmn16

    Sep 21, 2011
    charles town, wv
    Next Post - 15" speakers for those sweet bassy tones and 10' speakers for those punch mids - my final words on the matter.
     
  13. Fuzzonaut

    Fuzzonaut

    Aug 27, 2013
    Switzerland
  14. :laugh: sit down noob.
     
  15. dalkowski

    dalkowski Supporting Member

    May 20, 2009
    Massachusetts USofA
    So what's the best bass thru guitar cab for metal?
     
  16. 4dog

    4dog

    Aug 18, 2012
    off to a glowing start...the candle that burns brightest burns half as long...and you have burnes ao bright.
     
    scuzzy, Loring and msb like this.
  17. chris_b

    chris_b

    Jun 2, 2007
    Man. . . get a new id and start again.
     
  18. MYLOWFREQ

    MYLOWFREQ Supporting Member

    May 13, 2011
    New York
    :rollno: :banghead: :dead:
     
    SunByrne likes this.
  19. dalkowski

    dalkowski Supporting Member

    May 20, 2009
    Massachusetts USofA
    I read this post and I can't help visualizing that it was written by Jean-Ralphio Saperstein.
     

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