Converting open-back cab to closed for more bass--

Discussion in 'Amps and Cabs' started by brewbaker, Apr 17, 2008.

  1. brewbaker

    brewbaker Supporting Member

    Messages:
    698
    Joined:
    Dec 10, 2005
    Location:
    Maine
    I have a Fender-style open-back cab. It's custom-made so the dimensions aren't conventional. It's a little taller and a little narrower than a Princeton cab but the depth is the same. When I compare it with a Princeton I have it lacks bass and punch. I've even tried it with the same RW&B and it definitely seems like a cab issue. So I'm thinking about putting a larger lower back panel on it to see if that increases the bass response. Not entirely closed but leaving a smaller space between the lower panel and the top one. Think it will work?
     
  2. brewbaker

    brewbaker Supporting Member

    Messages:
    698
    Joined:
    Dec 10, 2005
    Location:
    Maine
    No takers on this?
     
  3. rockon1

    rockon1 Member

    Messages:
    11,485
    Joined:
    Aug 12, 2005
    Location:
    Stamford CT
    My large 2x12 Lopo closed back was tight but lacked bass. I tried "stuffing" it and that helped a bit but eventually removed the stuffing and went 1/3 open on the back on the bottom. Now it has much more low end. Thats all Ive got. Bob
     
  4. big e

    big e Member

    Messages:
    394
    Joined:
    Feb 18, 2007
    Location:
    Maryland
    I experimented with a 2x12 Marshall 1936 cab. It was originally closed back and I wanted an open back cab so I tried a number of different back panel sizes and I found a definite relationship between the size of the panels and the bass response. I'd suggest that before you spend a lot of money to get a tolex-ed panel experiment with a piece of plywood. I think you'll find yes the larger the panel the more bass will be emphasized but there will possibly be a point where you'll lose some of the "air" the open cabs to so well. Have fun experiment.
     
  5. mike80

    mike80 Member

    Messages:
    2,665
    Joined:
    Mar 8, 2008
    Location:
    Near Lima, Ohio
    There was a post over on The Boogie Board where a guy was experimenting with closing his open back combo, but the concern was with the tubes overheating. I think he ended up fabricating a back panel to cover the speaker, yet leave enough space for the tubes to have ventilation, and he was much happier with the end result.

    I would suggest getting a couple peices of scrap plywood and experimenting with different dimensions, and see which you like best, and go from there.
     

Share This Page