A good amplifier, in my opinion, but on 4ohm speakers, armonic
distortion rise terribly after 1/3 rotation of the knob. I tried with a
studio monitor Event 20/20 v2 monitor (4ohm) or with 2 jbl monitor
(8ohm) on parallel. On 8 ohm are perfect. On 4 ohm a disaster. A piano
make a harsh rasping sound. Just on the last clicks of the attenuators
(max level) the distortion disappears.