Audio Systems: Gain Level, qsc rmx850, gain level

Question
Hi my receiver has a sub output for LFE on the rear and I want to buy the QSC RMX850 amplifier and want to connect it to that LFE input and power my pair of subwoofers..... (150 watts @8ohms)so were should I set the gain level on this amplifier??

Answer
I need to know all of the specs of the subwoofer for me to answer that question. What is the manufacturer and model number? If they are not commercial subwoofers you will run the risk of over-powering them unless the ratings closely match the sub ratings. If the subs are consumer then you need to be more careful about matching the ratings. Take a look at the QSC specs to see what you need to look for. Watts and impedance is not enough information..