Rob what you have are a pair of Kicker XPL-KX10.4

As Loud stated they are from the '96-97 era and are quite different than the newer style XPL's (X10c) which had a slightly higher power handling rating (350rms), lower sensitivity (88.5dB), and different cone material.

Yours are rated at 300rms and have a sensitivity number just shy of 90dB.

Personally I never got a chance to audition the first gen. XPL's but I did try out the second gen's and I thought they were a great driver.
Handled a good amount of power, worked in many smaller enclosures and sounded excellent.
A bit expensive for what you were getting I thought but a good performer still.

__________________
Pioneer - MB Quart - OZ
http://www.cardomain.com/id/37554
"Your sister is hot but your mom does that thing with her tongue..."