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NEW and IMPROVED SWR SM-400S

Discussion in 'Amps and Cabs [BG]' started by iplaybass, May 1, 2003.


  1. iplaybass

    iplaybass Guest

    Feb 13, 2000
    Germantown, TN
    Ok, there's not a new model from SWR. But, I ordered a new fan for my SWR SM-400S, and it is now THE BOMB. Well... more like the quiet. It's soft, low whisper doesn't have the high pitched whine of the old fan, and its probably half as loud. Most importantly, it cost me $15! :D Whoo hoo! I'm kinda proud, I'm usually not so resourceful. Anybody who has an SM400S should give this a shot if they're having fan noise trouble. :cool:
     
  2. bentem

    bentem

    Oct 18, 2002
    Rockville, MD
    wow, for a second there, i thought you got a swr sm400s for $15. :D
     
  3. The SM 400-S obnoxious fan noise is the only thing
    the really bugs me about an otherwise
    excellent amp that I wouldn't trade for anything.

    I'm gonna' order myself one tomorrow.

    How easy was it to remove the old fan and
    replace it with the new one?

    Does it come with directions?
     
  4. iplaybass

    iplaybass Guest

    Feb 13, 2000
    Germantown, TN
    It was pretty simple. Once you take the top off, you will see that the fan is secured by an L shaped plate that is attached to the bottom of the chassis by screws. The plate is underneath a circuit board, however, and you must take out the board by unscrewing 4 screws and lifting up the board. Then you can take out the fan. The fan is a 24volt DC model rated for 180milliamps. Find a new fan that is close to this (mine was a Panaflo, 24volts and 170milliamps) and splice the wires for the new one. Now, let me say that the fan noise does not go away, it is still there. However, it is much reduced, and most importantly the annoying high pitched whine is gone!

    No directions, but I'd be happy to help with any questions. I'm no electronics master or anything of the type, so I'd say it was pretty easy. No soldering required.:bassist:
     
  5. Thanks for the info ipb.
     
  6. DirtDog

    DirtDog

    Jun 7, 2002
    The Deep North
    Where'd you order the fan from?? SWR??

    DD
     
  7. iplaybass

    iplaybass Guest

    Feb 13, 2000
    Germantown, TN
  8. I give up.

    Could you please specifically provide the model #?
     
  9. iplaybass

    iplaybass Guest

    Feb 13, 2000
    Germantown, TN
  10. Thanks.

    You the man.
     
  11. iplaybass

    iplaybass Guest

    Feb 13, 2000
    Germantown, TN
    Thanks Donne, I'll be interested to hear your perspective on the mod, I haven't done any gigging with the new fan and I'd like to hear what you think.
     
  12. Previous post heavily edited due to being
    mis-lead by SWR Customer Service.

    Great Mod!

    Thanks for the tip.
     
  13. iplaybass

    iplaybass Guest

    Feb 13, 2000
    Germantown, TN
    Very interesting Donne. Probably a placebo effect on my part, but it really does seem quieter. Sorry to send you all on a wild goose chase. As for the heat level; I haven't noticed any problems, but after what you said I suppose I can't in good conscience recommend this to anyone else. :( I'll take my chances for now; if anything goes wrong then I'll just put the old fan back in and hope I haven't done irreperable damage. Shoot... I really thought I was on to something. :oops: :bawl:
     
  14. DirtDog

    DirtDog

    Jun 7, 2002
    The Deep North
    Donne - thanks for posting this. My feeling is there's too much to risk for the sake of a couple of dbs.

    DD
     
  15. I was Wrong, Wrong, Wrong

    New 51 CFM replacement fan arrived from SWR.
    It was a Mechatronics F8025X24B

    After installation, the fan was
    Super Loud!!!

    51 CFM was more air then the case ventalation could take.

    The wind being sucked through the vents sounded
    like a jet taking off.

    It was by far the loudest amp cooling fan I
    have ever heard in my life.

    My wife was walking by the office door and
    asking if it was 'supposed' to sound like that.

    So I looked up the old fan.
    It was a Nidec 24v. with a CFM of 43.

    I took out the ridiculously loud,
    new Mechatronics fan replacement that SWR sent me
    and put back the old Nidec fan.

    I was wrong.

    Go with the Panaflo.
    The difference is only 3 or 4 CFM.