I have a cort action dlx 5, and my friend has a cort action 4. normally, i'd expect both basses to have a similar sound, but his sound is WAY richer than mine, i think its my strings, my strings are really old. his strings were new. could that be the reason? or is there something wrong with the bass guitar's electronics itself?
Yes, it's more than likely the strings. Fresh strings are much more harmonically rich than dead ones, far nicer sounding for most applications to my ear. Replacing old strings can breath new life into a bass.