"The Apex Butte is an affordable class-AB headphone amplifier built with the same quality design as the other Apex products. Small in size, it can still deliver a lot of power to drive virtually any headphones."
"The Butte is a DC-coupled design, so it can deliver bass punch that no cap-coupled amp can deliver. It has incredibly low distortion and an insanely wide frequency response. It is very transparent."
Norse Audio 4-wire Norn series up-occ LCD-2 headphone cable
From Norse Audio: - UP-OCC mono crystal LITZ stranded copper, the purest copper available in...
Q-Audio French Silk Cable
Q-Audio Type 2 Litz aftermarket cables for Hifiman, Audeze, Shure, and MrSpeakers Alpha Dog