Hi All, I've got a yamaha ax620 amp, and in the manual, if u set speakers to small, frequences from 90hz and below are sent to the sub. I also have a yamaha sw45 sub, B&W 302 s and cc3, for which the cc3 goes down to 80hz and the 302 s goes to 72hz. What do I set my high cut at on the sub? At 90 to match the amp or between 70 & 80 to match the speakers. No need to worry about rears as they are Ariston MSX03 MKii from richer sounds at £15. cheers.