I just my first pickup switch project on a Chinese made Sterling Sub ray 4, which by the way is awesome. I also happen to have the Seymour Duncan spb 4d pick up laying around so I thought I'd make it switch just because. I recorded both and A/Bed it and I can definately here the difference. There seems to be more clarity on the low end. It's quite subtle. I'm wondering if I'm missing something here because when I put SD pickups on my precision bass there was a BIG difference. Anyone else have experience?