Great amp for JBL studio 580 speakers
The PA400 is a great step up from the SMSL AO300 and A300. Imaging is perfect with a great center. Power is amazing with nice tonal balance. Makes my JBL studio 580s sound like new speakers. I always thought the horn was too bright, turns out I just needed better amplification. Running a single amp in stereo, XLR connected from Topping e70 velvet (also great). Apos is great, many great purchases from them over the years. Try the amp and you'll keep it.