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Mxr M87 Bass compressor makes no sound

Discussion in 'Effects [BG]' started by flacoclef, Oct 2, 2013.


  1. flacoclef

    flacoclef Supporting Member

    Sep 10, 2000
    Texas
    I connected my bass to a Sadowsky Outboard preamp then to the Mxr M87 and it stopped working. It made a noise like a dead battery, although it was connected to a 1spot, then no more sound came from it. All the lights turn on. And no sound.
     
  2. bongomania

    bongomania Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs
    Have you tried powering it with a battery instead, or a different power supply?
     
  3. When you hook up the M87 to power, the M87's meters should peak and then come down. Hit the footswitch and see if the blue led lights up. If not, your adapter may not be working or it isn't connecting properly (I've had that issue using a boss adapter).
    Re-reading your question and maybe it's your cables. Try going from preamp to your amp and ensure it's fine, remove the connection to your preamp and put it into your compressor. If no signal, it is your compressor giving you some grief. As bongo said, try a battery. If you have a signal, it may be your cable going from the preamp to your compressor.
     
  4. flacoclef

    flacoclef Supporting Member

    Sep 10, 2000
    Texas
    Thanks guys. I connected it directly to the compressor and nothing. Also, when it turns on, all the lights go ip as usual. I stomp on it and the blue light goes on but mo sound. I play on bypass and it sounds perfectly.
     
  5. mmbongo

    mmbongo Five Time World Champion Supporting Member

    Aug 5, 2009
    Carolinas
    Sounds like cabling. Try it by itself, no other pedals in the chain.
     
  6. flacoclef

    flacoclef Supporting Member

    Sep 10, 2000
    Texas
    Okay. Bass to pedal, pedal to amp. On bypass it sounds normally, could it be cabling?
     
  7. bongomania

    bongomania Commercial User

    Oct 17, 2005
    PDX, OR
    owner, OVNIFX and OVNILabs
    Did you try a different power supply yet?

    It could be the cables somehow, but that seems unlikely.
     
  8. flacoclef

    flacoclef Supporting Member

    Sep 10, 2000
    Texas
    I'll check with a battery today.
     
  9. flacoclef

    flacoclef Supporting Member

    Sep 10, 2000
    Texas
    Same thing with the battery. It's going back!
     
  10. avvie

    avvie

    Oct 12, 2010
    Maui, HI
    If it works fine when turned off its not the cables. Sometimes defects happen. Trade it in for another.
     
  11. Doner Designs

    Doner Designs Steve Doner Gold Supporting Member

    Jun 2, 2012
    Metro Chicago Area
    Doner Designs is an alias for Steve Doner
    After a couple years of very light use at home, mine has died with the same issue as described above. Bypass is ok, lights come on with or without batteries but no sound. Completely dead (in terms of sound) when engaged. This is probably the first electronic device failure I have seen in decades.
     
  12. PBrown

    PBrown Supporting Member

    Apr 28, 2009
    Billings, MT
    Mine just did the same thing last week--I am bummed, to say the least. Pretty expensive pedal to have go out like that. Also, very light use.
     
  13. rufus.K

    rufus.K

    Oct 18, 2015
    SoCal
    Mine is a battery eater, but has alway's worked wonderfully
     
  14. Doner Designs

    Doner Designs Steve Doner Gold Supporting Member

    Jun 2, 2012
    Metro Chicago Area
    Doner Designs is an alias for Steve Doner
    Contact MXR. They may repair it for free depending on age and condition, even if it's technically out of warranty.
     
    PBrown likes this.
  15. PBrown

    PBrown Supporting Member

    Apr 28, 2009
    Billings, MT
    Thanks! I'm hoping they will. I emailed them and included this thread. I'll post if I hear anything.
    P
     
  16. JODowd

    JODowd

    Feb 28, 2017
    Corvallis, MT
    Hey, same thing happened to mine 6 months past warranty! Lightly used. Looks brand new. Dead as a door-nail. Did you ever try to contact Dunlop? Did they make it right? Just wondering before I waste any more time.

    Thanks.
     
  17. Fuzzbass

    Fuzzbass P5 with overdrive Gold Supporting Member

    I've seen a number of similar reports, and all prove that the Ovni Labs caveat about the M87 is valid:
    MXR M87 Bass Compressor and M76 Studio

    As also noted the M87 has its good points, and there are many satisfied users.
     
  18. franvarin

    franvarin

    May 30, 2013
    Rhode Island
    I had what sounds like the same problem. I was able to get a signal and use all of the knobs except the output. It happened suddenly and did make a noise then just had no output. I called MXR and they had me send it for repair. They ended up replacing the gutts of the pedal and sending it back. I was pleased to see they stand behind their products!
     
  19. acleex38

    acleex38

    Jul 28, 2006
    I also had that problem and they also fixed it for me after I was out of warranty - it was also "replace the guts" repair for me.

    Fantastic pedal, but I stopped trusting it.
     
  20. franvarin

    franvarin

    May 30, 2013
    Rhode Island
    I still use mine, great pedal. But, I can understand why you would be apprehensive about it. They're too expensive to keep a spare just laying around in case you happen to need it.

    I've considered it ot be a freak thing but, if it happens again I'll likely be in the market for something comparable to replace it.
     

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