I have about 175 hours, and my bass is less than stellar. Also, there is not a luscious midrange (yet). I have read epic reviews but have not experienced that thus far. What should I expect over time? Getting a little worried!
The L-590AXII although a Class A amp sounds very close to neutral. In other words, it won’t give you an overly luscious, syrupy or glowing midrange that some tube amps are capable of. The midrange of the L-590AXII sounds smooth without any grain if compared to other solid-state amps but it won’t sound like a tube amp with glowing, warm or lit midrange.
The bass of the amp will be dependent on the type of speakers and room. The bass is lean, defined, layered, detailed and taut as opposed to loose or full. To me it's quality bass.