MXR-M80 Popping issue??

Discussion in 'Effects [BG]' started by freebeer, Dec 7, 2005.

  1. Hey everyone,

    I recently got an MXR M-80 Bass DI from a fellow talkbasser. Cool pedal. I have been trying it out on some of my different basses and it sounds really nice. I decided to try it out with my G&L L2000 and it sounds great. Problem is whenever I switch the treble boost switch on the G&L the thing ommits a fierce "POP" when the swith is moved. Anyone else seen this with this pedal/bass combination? Any ideas on a potential way to make it stop doing this?
  2. My MXR M-80 bass di pedal makes a POPPING noise whenever I hit either of the two foot buttons. Same thing with my Peterson tuner. There's just something weird about that type of metal switch.................

  3. You've just discovered that there are pitfalls to this true bypass stuff! Here's an excellent article by the legendary R.G. intended for DIYers that might help you work out what's going on. Without knowing the MXR schematic I can't tell you if any of these remedies are inplace on the factory units.
  4. I am a little confused though as it's when I move the switches on the L2000 when I get a pop, otherwise the M80 is dead silent...
  5. oh sorry, obviously read that post wrong!

    So, does this happen when the effect is engaged or bypassed or both?

    There's no hint of the pop when the bass is connected directly?
  6. No popping with the bass plugged directly in the amp. Popping happens with the effect on or off.
  7. I would suggest that, if you can, try a different pedal - like if you can get down to the shop you bought it from and try another one with your bass.

    Then, if it still happens, ask the techs to look at your bass to check if the DC blocking caps are doing their job.
  8. momo


    Oct 22, 2005
    Huntington Beach, CA
    The only thing I could think to try is the ground switch. It could be something there.