I use a KN7000 at different size rooms,with different speakers. Like no ext spkr,to Z2200's,to Peavy KB300's. The Peavey's have LMH only.One could use the kb mixer,but wonder if a rackmount would be easier,or even necessary. I have a Behringer mixer in my rack to control volume for KB,speakers,and VR harmoniser.
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact