i currently own a trio ka 5300 as my main amp, relegated the "s" amp to the bottom of the rack because the 5300 just sound so sweet, clear and clean (and this is even without a loudness contour lever). i am planning to buy very soon a ka 7300 and i surely know (with the good reviews on this forum), it will sound even better. i really love the trio-kenwood sound!
edit:
just scored the trio ka 7300 last saturday, having a blast listening to it.