Given he is not looking for a sub for movies just music and definatly not looking for floor shaking bottom end , just enough to hear a little more depth in the music.
Given that it is 500 watts and goes down to 17 hz, well below what is needed and 106db another well more volumn than needed. Two of these suckers probably do fine, just enough to bring up the bottom end a tad more. Two 8's are better than a 10" and Ep500 and up would be over kill,

What about the Martin Logan Descent 1? I heard that a couple months ago and that kicked some A$$

Pioneer sc-1525
M80 HG Cherry