I have had my JBL L-65's in storage and would like to switch them out with my JBL L-150's I'm currently using. I've been told that I'll be losing a lot of bottom end. If I incorporate a Powered Subwoofer to run with my L-65's would this be a net gain in my total sound? I'm a big fan of the 077 Tweeters in my L-65's and was hoping to not lose any bottom end.