RCA cables from preamp to amplifier

Just beginning to tool around with seperating my equipment and component rack from in between the spkrs. I've wanted to do it the cheapest way possible (in my eyes) just to see what happens. As you see my system has straightwire rhapsody's (6ft) which I've had for at least 8yrs and no other type. The cables that were just purchased so that I can place everything minus the amplifier behind the listening chair are 25ft Comprehensive XHD for less than fifty dollars a pair brand new. Does anyone know if sound will suffer? I know it's said in all advice to keep cable lengths as short as possible.