Choice of speaker cable in every case contributes to the sound result of an audio system, just as all components do. The Rega Brio-R, as has been mentioned already above, is very responsive/revealing of different speaker cables, along with other components. And as has also been suggested, the TQ Blue is a quality low-cost speaker cable that should cool/sooth a too-warm/sharp sound. Ideally you should buy a set from a supplier who is happy to exchange them if you don't like the sound they help to produce. (In practice, this usually means buying a set of equal lengths)