One thing, check what the subsonic filter is on your RF amp. I believe the bd models have fixed ssf at 15hz which isn't a good idea for a ported enclosure, unless your tuning that low, but your not since this is your daily driver. If it's fixed at 15hz, add an inline filter such as an fmod, or possibly your headunit has some filtering (although I doubt it unless it's something fancy), or get a different amp.