I didn't get it. You mean the JVC has poor bass quality?
What also about the nuforce 7e? Has it deep bass and good SQ? Or maybe klipsch s4?
Just a heads up on the HP-FX500s, I played this with them unamped through onboard sound:
YouTube - Bass Outlaws - Extreme Subwoofer Test
Now I'm quite nauseous, no joke. It was ridiculous.