My first "modification" was to get my 35-year-old "daily driver" Heresy's back into tip-top shape.
My Christmas gift to myself last year was a fresh new pair of crossovers, and a new pair of main drivers for my Heresy's.....bought 'em from good ol' Bob Crites himself, the main retired Klipsch man.
Boy they sure sounded super now, but there still was something missing.
Later, I finally took ramonda's advice and added a 12" Klipsch sub that I found on the ebays.
I have come to the conclusion that I should have been running a sub all along. There is sooooo much to be herd, that I wasn't hearing.
Borrow one sometime and use it for a week, and you will hear what I mean.