Your comment about bass and the music you listen to suggests to me that you would like the harder hitting PB13 more than something like the EP500.
As someone who has A/B tested the PB13 against the EP600, I'm not sure you would actually notice this difference with music (though admittedly I have not compared to the 500). Before I calibrated the two subs, I believed that the PB13 hit harder for music as well, but once calibrated, I could not notice a significant difference in music between the two on any kind of music. The exception was when running the PB13 in sealed mode.
When running sealed, it definitely had a different sound and did "punch" more than when running ported. However, I felt it gave up too much in SPL for home theater in this mode. Since I listen to lot more HT than music, that wasn't a great trade off for me. If you do more music than HT, the sealed PB13 may give you the sound you're looking for.
Jason
