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heavy power amp rackmount issue

Discussion in 'Amps and Cabs [BG]' started by Jim Carr, Oct 21, 2006.


  1. Jim Carr

    Jim Carr Dr. Jim Gold Supporting Member

    Jan 21, 2006
    Denton, TX or Kailua, HI
    fEARful Kool-Aid dispensing liberal academic card-carrying union member Musicians Local 72-147
    I am about to get a 40+ lbs power amp. It is recommeneded by
    companies like Crest and QSC, that these amps be mounted using front
    AND rear rack rails. Do you bassists with heavy "lead sled" amps do this? :confused:

    My 4-space rack, a very typical abs/plywood rack with recessed handles,
    ball corners, etc., has no rear rails. The SWR 350 head and BBE B-Max
    preamp I currently have mounted in it weigh about 18 lbs and 8 lbs.,
    respectively. I plan to keep using the BBE B-Max. :p

    Will I be asking for bent rack ears on my amp if I don't get a new rack
    with rear rails? :crying:

    I don't think installing rear rails is an option, as the plywood/abs is quite
    thin. Can anyone tell me what they have done and/or where they found a
    strong rack with front AND rear rails? Thanks! :cool:
     
  2. tadawson

    tadawson

    Aug 24, 2005
    Lewisville, TX
    That, or just put the amp in the bottom, and make sure that the rear is supported by something. I have three Crest CA amps (one 9 and two 6's) and a 3001 in a rack with no rear rails, but the start in the bottom, and sit on the base of the rack. 10 years later with the rack being roaded a fair amount, and the face plates look brand new. And I tend to load it upside down, for ease of getting it in and out of the trailer, and still no problems . . .

    - Tim
     
  3. i was going to say the same thing, mount weight wise from the bottom and when transporting, put it face down in the trailor/car/truck/etc...

    :ninja: whatchya gonna do with that 350x:D
     
  4. DEVILMAN

    DEVILMAN

    Nov 24, 2001
    New York,NY
    I run my Crown MA2402 in the bottom part of my rack with enough room between the bottom of the amp to the rack case to slip a 2''x4" front to back, 4" side down(cut to the depth of your rack so it closes properly)to support the amp front to back without worrying about additional mounting problems or broken parts. Doing it for years & it works great.

    ~S~

    PS: If you can't use a 2x4, find an appropiate size piece of lumber.
     
  5. Jim Carr

    Jim Carr Dr. Jim Gold Supporting Member

    Jan 21, 2006
    Denton, TX or Kailua, HI
    fEARful Kool-Aid dispensing liberal academic card-carrying union member Musicians Local 72-147
    Cool!
    A very good idea. I guess I was thinking of keeping the pre on the
    bottom to avoid "cooking" it too much, but then again, that's what those
    darned fans are for....Thanks!!! :D :D :D
     
  6. Jim Carr

    Jim Carr Dr. Jim Gold Supporting Member

    Jan 21, 2006
    Denton, TX or Kailua, HI
    fEARful Kool-Aid dispensing liberal academic card-carrying union member Musicians Local 72-147
    Thanks for the thought. :D :D :D

    About the 350 (it's not an X, as it is about 4 and 1/2 years old)....
    hmmm, I have to decide if I will keep it as a spare. Problem is, I already
    have a Carvin Redline II (1000 watts bridged) for that.

    I really love that little SWR amp. It has never failed me, and sounds
    great with the tube Pre through a goliath II, or even a goliath II and a
    son of bertha. Just not sure yet....:meh:
     
  7. Jim Carr

    Jim Carr Dr. Jim Gold Supporting Member

    Jan 21, 2006
    Denton, TX or Kailua, HI
    fEARful Kool-Aid dispensing liberal academic card-carrying union member Musicians Local 72-147
    That's a very clever and rational idea. It might allow me to keep the amp
    up off the very bottom of the rack for better cooling, too.
    Thank you!!! :bassist: :bassist: :bassist:
     
  8. how do you think it would sound through a henry 8x8:p

    but anyway, not to derail the topic. the 2x4 idea works well but i would recomend anchoring the piece(s) of wood (glue or epoxy) to the rack and be sure not to cover and cooling vents
     
  9. DEVILMAN

    DEVILMAN

    Nov 24, 2001
    New York,NY
    ...good idea, but I don't remember any amps having cooling vents on the bottom concerning intake or exaust. Heat rises & won't escape below, intakes are on the front or rear/side of amps with exaust usally on the opposite end or higher...

    ~S~

    PS: Just make sure the wood is snug...
     
  10. monkeyfinger

    monkeyfinger Moderator Staff Member Supporting Member

    I have a Crest CA-9 in a two space Road Ready case. I bought some accessory rear rack mounting brackets from QSC for about $20. They work great. They stick out of the back, but there is still plenty of room for the cover. The back protects the rear connections very well.
     
  11. My SVT-II is 85lbs, it is only front mounted, no problems
     
  12. v-12

    v-12

    Mar 3, 2005
    FL Panhandle
    ^ My Rivera is racked the same and I've had no problems, but I'd guess their face plates are a bit thicker! I second the wood under the back, i did it a while back and it worked great.
     
  13. tadawson

    tadawson

    Aug 24, 2005
    Lewisville, TX
    Most things can, but the Crest CA series stuff is incredibly deep for a 2U package, whereas the SVT-II is taller, and nowhere near as deep. I seriously doubt that you could hang a CA mid-rack without rear support and get away with it . . . . heck, they hang out the back of a lot of racks . . . .

    - Tim
     
  14. Jim Carr

    Jim Carr Dr. Jim Gold Supporting Member

    Jan 21, 2006
    Denton, TX or Kailua, HI
    fEARful Kool-Aid dispensing liberal academic card-carrying union member Musicians Local 72-147
    Good advice....thanks! :D

    The henry can handle 450 watts rms at 4 ohms. The 350 is, well, 350
    rms at 4 ohms. You wouldn't be able to use the full kick of that cab.
    As I recall, in an earlier thread, triclops got a 750x, and was pretty
    happy with it, once he fixed a bad driver. Bottom line, the 350 is nice,
    but if you need whallop, it may not be enough. :cool: :cool: :cool:
     
  15. The SVT is fairly deep still, and with the excessive mass of the thing.

    Mines sticks out the back of my rack :p
     

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