ok, i have a bartolini preamp installed on my bass w/ a bart triple coil. It is a 9v system right now and it sounds cool. To make it an 18V would only take a little soildering but i'm wondering if it would be worth my time. My question is this, what difference would an 18V system make to my sound. I'm not distorting right now, so headroom isn't a concern.. other than headroom, is there any difference? Thanks Brian.