Hi Harry,
I've looked into ice before, not sure about the S1, but on S3, I could upgrade the rear to some decent 2way speakers, which would would give me decent mid and treble, and also there's a storage space behind the seats, where I could mount a small 8"subwoofer box rated 500watts(cover the box with the same colour material as the interior and sit nicely in the corner, basically camouflage itself), then fit a pair of decent amps in the boot, and you'll have a really nice set up with decent bass....
