i was told by a guy at the local music store that if you play a passive bass you shouldnt use a cable over 10 feet long. Is that true? I think 15 feet would give me just that extra length i need. Also, is there any *real* difference in sound quality than if you just use a regular guitar cable compared to a super high-end cable? I know the expensive cable will be more durable, but in terms of sound quality does it make a difference?