Hi all. ive had a peavey fire bass 700 and ive been using a 4x10 8ohm ashdown cab for about 6 years now and im realy still not getting the sound i want out of it so i have a few questions. 1. is it better to use 4ohm cabs for sound qaulity or 8ohm 2. should i also use a 15" or 18" sub as well as the 4x10 3. what is a good mixture of cabnets to use on these and ohm wise. as you can tell im not much of a amp person more of a bass guitar person myself. thanks for any help you can offer.