Kolledog, it depends on the impedance of your loudspeakers. If your speakers are 4 ohms or less you are probably better off with shorter speaker wires even though your system is not balanced. I always ran long unbalanced interconnects to mono amps behind the speakers and never had any trouble. I would use a cable like Canare DA 206 which has twisted pair inner conductors of heavier gauge then you attach the shield on the preamp side only.
If your speakers are 8 ohms or higher longer speaker cables will work fine as long as you keep the gauge low enough. I would say 12 or lower. I like Kimber Kable either 8 or 12 TC.
If your speakers are 8 ohms or higher longer speaker cables will work fine as long as you keep the gauge low enough. I would say 12 or lower. I like Kimber Kable either 8 or 12 TC.