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.
Thank you Bill. I tried your suggestion, and as you say, I have plenty of headroom. and great response with no distortion at all.
Bernie
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact