I've been thinking about adding a subwoofer to the 968 to give the audio a bit more fullness. I don't want a stoplight thumper, just something that will add bass to the far-too-small speakers in the door. Ideally, a small powered subwoofer unit under the seat is what I want. On Amazon, there's a cheapo unit made by Boss for less-than $100... you can see it here:http://www.amazon.com/Boss-BASS600-Low-Profile-Amplified-Subwoofer/...
I don't know if I want something THAT cheap but that's the sort of thing I'm considering. Does anyone have experience with such a thing?