I have DSP as well and am able to get it to sound pretty good all oem with sub added, but did try a pair of aftermarket front speakers to see the sound difference. I bought a pair of JL audio VR650 CXi 6.5" speakers... which I still have like new in the box because they had no where near the bass reflex and clarity of the oem front doors, which really surprised me!

The only aftermarket speakers setup that always seems to get great reviews for the DSP system are the BSW stage 1 kit. But some say that while you gain high end clarity you loose the low end, so it doesn't sound right without upgrading the sub.

I bought an empth BSW 8" sub box and tried a couple of different subs, the hands down winner in quality and level of performance is the infinity reference 8" which I love now. Running it off of a 300 watt RMS directed amp with level control knob up front for on the go level adjustments.

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2003 4.6is