I have a long speaker cable run - 20 feet. I currently use Anticables and they sound surprisingly good. Although very affordable, they are close in SQ to the 6 foot speaker cables they replaced, which were $2k. YMMV, of course.
Having said that, 20m is awfully long. Your best solution might be to split the difference, making the interconnects a little longer and the speaker cables a little shorter.
Bryon
Having said that, 20m is awfully long. Your best solution might be to split the difference, making the interconnects a little longer and the speaker cables a little shorter.
Bryon