Teens with superpowers who are the kids of ex-superheros

I must've read these books years and years ago but I can for the life of me remember the name, and I've tried looking but no luck, so I'm turning to you guys.

From what I remember, the world used to have a bunch of superheros, but then some villain's big device took away everybody's superpowers during their last big confrontation. The book takes place years after that when a bunch of the ex-superheros now have kids, who are the main characters. I remember two in particular, one of them had superspeed, but he lost his powers at the end of the first book stopping some big machine. The other one had super strength (I think) and he ended up fighting on the bad guys side for a time for one reason or another, I think maybe a girl was involved.

Anyways if you can find it that'd be awesome. I remember loving reading the parts when the superspeed kid used his powers cause they were so cool