BA115 tilt back conversion

Discussion in 'Amps and Cabs [BG]' started by nojj, Jul 11, 2013.

  1. nojj

    nojj Guest

    May 20, 2013
    Got a tiltback cab, amp is unreliable.
    I was thinking on putting a 1RU amp in it's place (width permitting)
    or one of those micro heads.
    The cavity on the back is 19.5" width,8.5" ht, 3.25" depth.
    There's a cut out on the top where the controls used to go,16.5" across, amp was mounted vertically in the cavity.

    Was also thinking on replacing the stock 150w 4 ohm speaker with something more robust, hopefully a neo.

    Any thoughts on the subject? Do-able? Not worth the effort? Better to just place the micro on top? Buy myself a nice higher-end combo?
    Will replacing the speaker disturb the space-time continuum?

    I realize that it's essentially a practice cab, but it worked well for some of the venues I play.
  2. Grissle


    May 17, 2009
    Interesting idea, would a pf350 fit?
  3. nojj

    nojj Guest

    May 20, 2013
    nope, the pf350 is 11", too long to mount in the cavity.
    Prolly work nice on top, though.
  4. I'd like to see where you get with this. I have a BA115T that sounds like crap and is out of warranty so I don't feel it's worth getting it repaired but would love to mod it up.
  5. nojj

    nojj Guest

    May 20, 2013
    So far what I did with it was (besides removing the errant amp) was to yank the tweeter, fill up the hole,
    mount some wheels along one of the side panels on the cab,
    and hardwire a jack in the back for the speaker.
    Cooperates nicely with my SWR 4004, and the Yorkie 400,
    long as I don't lean on it too hard.

    A 1RU amp or power amp *may* fit, depending on how close the controls are to the rack holes,
    but don't know if I can find one that's only 8" deep.
  6. That's a good idea.. I could install a jack so I could use my ashdown little bastard with it. Do you know how many ohms the speaker is? I assume its the same between both the 115 and 115T.

    Also I've already disconnected the tweeter but left it in there to keep it sealed :)
  7. Grissle


    May 17, 2009

    With my ba115 I changed the speaker to a JBL D-140 8ohm which sounds lovely and I'm guessing is a bit more efficient because there's been no volume loss over the stock 4ohm. Also changed the port and added a parallel speaker jack.
  8. 4 ohms and inefficient is exactly what I'm looking for at the moment but don't want to drop a bunch of cash on a whole new cabinet. I just need a quieter cab to use at home and something that is 4 ohms so I can run my head with only one pair of EL84's.

    And by parallel, do you mean that the speaker is still hooked up to the Ampeg amp and the speaker jack? Wouldn't this destroy BA115's amp?
  9. nojj

    nojj Guest

    May 20, 2013
    He could've meant that he put 2 jacks on the back of the cab, so he can run an ext 8 ohm cab, and still make 4 ohms.
    I thought about doing that, but most of my amps have 2 speaker outs anyway,
    and I have a couple double jack speaker cable extensions I built a while ago.
    Probably just added an extension jack on the amp or cab, and runs 2 8ohm spkrs in parallel.

    I tried running the BA115 amp on a 4 ohm 4x10, it didn't like it at all.

    I just sealed up the hole from the tweeter with a flat plate of metal.
  10. If the BA115 speaker is 4 ohms, running an 8 ohm cab in parallel would be 2.66 ohms. :confused:

    edit: just saw that he said he swapped the speaker for an 8 ohm one. Never mind :)

    I think I have a project for this weekend now haha
  11. nojj

    nojj Guest

    May 20, 2013
    I tried an 8 ohm in the BA115 w/ internal amp,
    it didn't like it, either.
    The amp was probably getting flaky at that time.

    Now if I found another cab close to the same dims, might be worth it to put in an (efficient) 8 ohm in each, and stack.