Also, your RCD won't have any effect whatsoever on the quality of your power feed - it's just a safety trip. Unless you're using something way more complex than a basic RCD...And, although it may sound wrong, if you are using a power conditioner, this can sometimes do horrible things to your sound. They tend to work fine for guitar amps and the like, but the instantaneous current demands of a high power bass amp can be interfered with. This is why, for bass amps, it's always ideal to plug your amp (and your RCD) straight into the wall socket if at all possible, using the heaviest mains cable you can. I'm assuming amps of 500W output or more; lesser output powers will be affected less. I'll admit, I thought this was garbage, but switched to a heavy, hand-built (by me) mains lead. On gigs where you're winding it up a bit, it does seem to keep things smoother!