Hello audiophiles. I recently ordered the Rotel RA 1570 intergraded amplifier that I will use with my Polk Audio RTIA7 speakers. I used to drive the Polk with a 5.1 receiver RXV485. No complaints with the receiver but I believe that I will get a pure 2 channel sound quality with the Rotel. I would appreciate your input for this audio set up and I was wondering if I need to change my speakers in that case. thank you so much in advance. Yannis