Here is the situation (pub/restaurant live performance setup): A musician has his own wireless microphones plugged into and mixed on a Bose T1 ToneMatch Audio Engine. This device also drives his powered speakers at the performance area.
- A TRS->XLR cable is plugged into the balanced TRS master output on the Bose T1.
- The XLR end is connected to an XLR jack in the wall. This is a 150ft XLR run that leads to a high-powered amplifier which drives speakers throughout the restaurant.
- At the other end of the XLR cable, the same model TRS/XLR converter is attached and used to plug into the TS input on the high-powered amplifier.
Signal chain summary:
Bose T1 Balanced Master Output TRS -> TRS/XLR -> XLR/XLR -> XLR/TRS -> High-powered amplifier TS input
Believe it or not, there are no issues with the sound coming from speakers driven by the high-powered amp. However, as soon as the amplifier is powered, regardless of whether anything is plugged into the TS input, the musician's speakers begin loudly popping and crackling.
Any ideas on how to fix this? It seems that EMI must be traveling back into the Bose T1 via the master output.