I laughed when I read your post...but not for the reason you thought! The L100's were and still are outstanding speakers although I'm sure your original foam covers have deteriorated by now and you're probably running them with nothing in front to the speakers. You can certainly replace them and get different sound...but you might well find that in a blind test, the JBL's sound better than many/most of the newer speakers.
I would not replace them...I would add a subwoofer like the James emb-1200 which is very musical (it's fast and doesn't boom). I would spend my money on replacing the amp...maybe a used NHT Power 5 or ATI 1505 and I'd buy a good preamp/processor that could handle 4 speakers plus the sub well....many choices here.
Don't confuse old with not good. AR3a's and JBL L100's were wonderful speakers. From what you described, your weak link is the Yamaha unit.
I would not replace them...I would add a subwoofer like the James emb-1200 which is very musical (it's fast and doesn't boom). I would spend my money on replacing the amp...maybe a used NHT Power 5 or ATI 1505 and I'd buy a good preamp/processor that could handle 4 speakers plus the sub well....many choices here.
Don't confuse old with not good. AR3a's and JBL L100's were wonderful speakers. From what you described, your weak link is the Yamaha unit.