Hey CB,
So, here's a challenge for all of you people. I have a nasty hum coming from my right main speaker (QSC K12) and the KSub connected to it. Standard troubleshooting failed, and after an entire few days messing with it, I give up. Here's the setup:
The speakers are all on the same circuit, and the mixer is on a different one. That being said, they are all on the same panel.
What I know:
Any wisdom would be appreciated...
So, here's a challenge for all of you people. I have a nasty hum coming from my right main speaker (QSC K12) and the KSub connected to it. Standard troubleshooting failed, and after an entire few days messing with it, I give up. Here's the setup:
- A&H MixWizard, LR out
- Multipin plugged into wall receptacle
- Multipin cable runs in underground conduit to XLR panels around the stage
- Right speaker (Stage Left) to an XLR outlet for KSub
- Solder pins on XLR outlet split off
- Split off signal goes to K12 line input, 0dB gain
The speakers are all on the same circuit, and the mixer is on a different one. That being said, they are all on the same panel.
What I know:
- Putting mixer and speakers on the same circuit does not fix the problem.
- Plugging the mixer directly into the speaker (long XLR cable across auditorium) DOES remove hum.
- Tested entire multipin run for continuity, all pins work fine.
- Powering board "off" amplifies hum by around 20-30dB.
- Removing either the KSub or the K12 has no effect.
- Adding additional inline equipment such as equalizers or compressors will amplify the hum by a small amount.
- Board output does not matter, it is the same speaker whether plugged in to L, R, or M.
Any wisdom would be appreciated...