These copper speaker cables are not intended for audiophile use. They are so inexpensive. But the performance is suprising for the price. Wide frequency range, good transparency and fluidity, sharp and well focus soundstage. Extended treble. Deep extended bass. Full body sound. Best length: 8 feet. With length shorter than 8 feet, highs become intrusive. With longer length, they are less revealing and are a bit too warm. They are pefect for home theater system and even audiophile use. The only bad point is about the size of the image. Imaging is precise but not very huge. Compared with very high quality audiophile speaker cables, they may sound slightly less clean.