Hello Friend,
I'm currently running LSi series (9's and 15's), and I discovered they LOVE Yamaha equipment! ! ! Initially I was dissapointed, because my heart believes my Parasound can make 'everything' sound great, but isn't the case with the LSi's. I've several comments about the LSi series being "too laid back." Perhaps, that's why the seem livelier with Yamaha equipment (historically, Yamaha's are very 'forward' (emphasize Highs and Mids). Add that to Polks and . . . . . more livelier/balanced LSi speakers. This is the 'kicker.' I am currently running a Yamaha RX-Z1 (reciever/integrated amp). That worked great, BUT . . . honestly, it's a gloriified pre-amp with my old&faithful M-80 (Vintage Yamaha am - originally was a C-80 pre-amp/M-80 amp combination). As I said, I was using my Parasound initially, but . . . .like Krell, the low-end was emphasized more. A very long-winded way of saying/recommending finding a higher-end Yamaha power source (hint: the M-80 is 250wpc, and wasn't a 'slouch' by any means, back-in-it's-day) AND it still sounds great (If interested - there is more to the M-80. I tweaked on it, changed the connecting post, etc)
