Search real tips about Multi Sub plate humm sound

Hi guyz ! 🙂

I have 4 sub AMP plate and now I have a humm sound because 2 plates was un the same AC plug and no humm but 2 other was un different Ac plug on the Room and I think it created Ground Loop. Anybody have a real solution !?

  • I try AUDIO Ground isolator = more humm 🙁
  • I dont have third pin AC mass Ground on any amps on this system.
  • I try to add coupling cap 0.1uf or 3.3 or 15uf = not Working

Thanks in advance for your help 😀

nicK
 
Have you measured if the AC sockets have the same phase?
If not change the electical wiring and make the used AC sockets to have same phase.
Try with an extension cord first and plug your subs all to the same AC socket before you start chaning the wiring in your room.
 
Basically you will need to go to the breaker box in ur place and wire the outlets to the same breaker so they are in the same phase, if you have a 240V service in your home ,there are 2 120v phases.

Other solution is to get extension cords as dominik.says.

One that have worked for me sometimes on clubs, was to use a direct box.

But I was feeding active speakers with XLR balanced audio ins,
If your plate amps don't have XLR ins I guess that solution won't work. Do they ?