I think if you have enough inputs on the Bose , then no. I don't know the controls on the Bose but if it has a Master Volume run it wide open and adjust from the channel controls or your keyboard. Don't limit the amps headroom.
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer