With all of my amps in the past, I've been a 10 on both volume and tone knobs on the guitar. With the DSL20HR, I've had to run the tone knob between 7 to 8. And the amp was still too bright in the 2 to 4 kHz range. Swapping to the Eminence Governor has already been an improvement in that range, before breaking in. The amp is good. It just needs some understanding and tweaking. Keep the treble and presence in check and don't go over 5 on the gain knob.