I have a BOSE ACOUSTIMASS 6 & Denon AVR1705 home theatre, compatible set up ?

I want to get more volume out of the central speaker as sometimes the voices seem to be lower than usual. I find the 5.1 format ok but rather low on volume when it comes to certain voices on the centre speaker , would a double speaker from the 10 series be ideal or a waste of time ? I have set the speakers ( front... show more I want to get more volume out of the central speaker as sometimes the voices seem to be lower than usual. I find the 5.1 format ok but rather low on volume when it comes to certain voices on the centre speaker , would a double speaker from the 10 series be ideal or a waste of time ?
I have set the speakers ( front & rear ) at vol. 10. Correct ?
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