Nakamichi PA-5, and they sound great.
This is the second pair I've had, and both times I've felt that I'm not hearing the deeeeep bass I expect from a fifteen inch woofer. The design trades off deep bass response for efficiency, and that's one of the reasons it's compared to the Klipsch Heresy. The main one is the horns.
They go deep enough and play loud and clean.