Noone mentioned the Hifonics Brutus craze that went on a few years back!
Then there was the big RE XXX vs Adire Brahma war. (Write their names on seperate pieces of paper. Crumple them both up and shove them up your ***. Pull one piece of paper out. Buy that sub. =p )
Then the Jmac box buzz- but he does design a **** fine box.
The IA subwoofers had 15 minutes in the spotlight. Type R's still got nothin' on em.
DSL or ADS were the comp set to have back in the day, along with the short lived success of the RE XXX mids. Shoot, I remember trying to make kicks with a 4" mounting depth.
The Aura Tweeters.... which still pwn all. =)
Can't think of anything else.