Has anyone done a home demo or in-store a/b of an L550 axii vs l590 axii or l509x? I currently have a 550 which I need to return due to an odd issue with random static, pop noises audible through speakers. Issue aside, the SQ is really good but based on reviews here and elsewhere I’m really interested how the 550 compares to the others listed. I’m not in need of more power but would appreciate any first hand experiences on the sonic differences of these models. I would demo myself but I’m unable too for a few months. Had purchased the 550 unheard online..