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Stage PA Amp 101 question

I have a stereo amplifier. It's a really powerful Ashly that is nice sounding. (Not really important to this topic). Being that it has two channels, can I run a mono mix to front of house (two speakers only @ 8 ohms) on one side of the amp. .And run stage monitors on the other channel ? I have a sneaky suspicion its ok as long as my ohm load is equal on both channels. Or, am I wrong.

How to solve rumbling on the stage caused by Subs?

Hello experts,

Jarjar here. Misa confused about Subs causing rumble on the stage.
I worked as stage hand to a concert last week. They had problems with this rumbling movement caused by the subs. The subs were positioned in front of the stage, piled in 6 pairs, so there were 12 subs in total. But the vibration the subs caused was annoying for the musicians on stage.

stage monitors

I'm investigate the requirements to upgrade our church monitors. We currently have an acoustic guitar, keyboard, piano, organ, drum set, three backup vocalists and lead vocalists. All of which are supported by one monitor feed (Guitar, organ and drums are not included in feed).