I have never noticed this but I want to make sure that this is normal. I run my QSC PLX-1602 bridged into 4 ohms. I was playing at a rehersal and noticed that on both channels, the gain led's were moving. I double checked the switches in the rear panel and the amp was in bridged mono. The bridged mono light was illuminated and the parallel led was not illuminated on the front panel. I cant remember if both gain led's were moving in unison. All I remember was both channels lighing up (moving up and down) while the amp was configured for bridged operation. Should both channel's gain indicaters light up and move when you are bridging the amplifier.