I would not get all hung up on THX this THX that, having the THX logo (like on receivers) doesn't say the other non-labeled THX receivers would not qualify for THX. In regards to the 500, it is capable of 18hz in-room and capable of 120dB undistorted.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85