dampening?

Discussion in 'Amps and Cabs [BG]' started by TrevorOfDoom, Apr 11, 2012.

  1. TrevorOfDoom

    TrevorOfDoom

    Jun 17, 2007
    Austin, TX
    I've started a project with a gui**** friend of mine building cabs. We're starting with some basic guitar cabs then we'll get to a bass cab or two for me.
    We've got WinISD and are trying to figure it out (i'm still reading threads on it).
    One question i have that i haven't found the answer for is this: Why dampening? Most quality bass cabs are insulated inside, but most guitar cabs are not. What's up with that? What does the insulation do?
    Thanks in advance!
     
  2. barryaudio

    barryaudio

    Feb 9, 2012
    Massachusetts
    Authorized Builder: fEARful bass, greenboy designs, Bill Fitzmaurice
    Guitar cabs can benefit from dampening too. It will remove unwanted resonances and distortion where it is unexpected and you don't want it. It's less critical for open-back cabs, but if you are doing closed back, definitely add the dampening materials. But, even open back cabs can benefit. I've used dampening in all my guitar cab builds.
     
  3. Joe Louvar

    Joe Louvar Guest

    Jun 6, 2011
    Santa Rosa, CA USA
    Type 400 fiberglass is cheap and works great.
     
  4. babebambi

    babebambi

    Jan 7, 2008
    YTZ
    I don't think any speaker cab will benefit from dampening ...
    I think you guys meant to say damping?
     
  5. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Yamaha, Ampeg, Line 6, EMG
    No, I think they mean wetting it down with water.
     
  6. Passinwind

    Passinwind I know nothing. Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    No, look it up. ;)
     
  7. .
    I'm in the "damping" camp.

    Greg
     
  8. Munjibunga

    Munjibunga Retired Member

    May 6, 2000
    San Diego (when not at Groom Lake)
    Independent Contractor to Bass San Diego
    But not too wet, Jimmy. Just damp.
     
  9. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Yamaha, Ampeg, Line 6, EMG
    So would it be "wetting" or "wettening"?
     
  10. is it a dampened cab or a damped cab?
     
  11. billfitzmaurice

    billfitzmaurice Guest Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    The terms are interchangeable.
     
  12. Moist ftw.
     
  13. you guys need more coffee this morning... ;) the posts referring to unwanted resonances are for real the other guys just got out of the shower and maybe a bit damp themselves :rolleyes: Good morning TBers :D


    I have read that "acoutistuff" from Parts Express is very good (and used it, a bit pricey) but have used fiberfill (stuffing for teddy bears) also (cheaper), and I have seen many commercial cabs with fiberglass building insulation inside also. Could Bill or anyone with more experience than myself comment on these three products for "dampening" cabs?
     
  14. barryaudio

    barryaudio

    Feb 9, 2012
    Massachusetts
    Authorized Builder: fEARful bass, greenboy designs, Bill Fitzmaurice
    Using fiberglass also helps to insure that your cab is neither flammable nor inflammable.
     
  15. barryaudio

    barryaudio

    Feb 9, 2012
    Massachusetts
    Authorized Builder: fEARful bass, greenboy designs, Bill Fitzmaurice
    acoustastuf is good for stuffing midrange chambers. fiberglass is best for lining.
     
  16. Thank you sir. Anyone else?
     
  17. Joe Louvar

    Joe Louvar Guest

    Jun 6, 2011
    Santa Rosa, CA USA
    I’ve heard rumors beer works better than water but cost more. :D

    On a serious note - experiment with what you use for damping, how much you use (thickness, etc), and where you place it - because, it will change how the cab sounds.
     
  18. billfitzmaurice

    billfitzmaurice Guest Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    Never use fiberglass building insulation. Rigid fiberglass is the best material, but not easy to find. Open cell foam and polyester batting are slightly less effective but available at any fabric store or Walmart. Acoustistuff works well for stuffing sealed cabs and transmission lines, but not so much better than polyester pillow stuffing to justify the high price.
     
  19. Joe Louvar

    Joe Louvar Guest

    Jun 6, 2011
    Santa Rosa, CA USA
    Rigid fiberglass is also the same stuff used in good bass traps and etc - and if you can’t find it locally you can order it direct from Owens Corning, or Amazon.com, and etc.
     
  20. sickest beast

    sickest beast Guest

    Apr 22, 2006
    niagara falls, ON
    this is the worst thread on a serious question. clean up the pointless posts and we've got maybe 3 serious replies.