mosfet, try some of zanash's silver ribbon speaker cable.

silver is a better conductor than copper, ribbon has more surface area per cross section than wire, signal transmits largely due to skin effect at audio frequencies.

more skin, better conductor, sounds reasonable to me.

infact it sounds more than reasonable, it sounds sharp, unhazed and slightly more focussed... and all for about 1/5 the cost of some high end copper crap.