I have a Cupra ST 300 with Beats (rather than Seat Sound) with the subwoofer in the boot. Stupid question, but should I hear the bass from the subwoofer when I open the boot (and lift the floor)? The reason I ask is that I'm beginning to think it's not even on/working. When I adjust the Subwoofer slider on the options menu it seems to make zero difference to the base/sound. Anyone else advise or has similar issues?