help me find out what these are?

[ultrasonic]

i bought these speakers at a garage sale and i haven't been able to find out any of the specs on them and ive never herd of the manufacturer. its a 15" speaker with a 4 inch tweeter in the center, it says "Utah over 50 years, Huntington, ind. and there are 2 different numbers on them, one is, 1037534, and the other one is d15pxc-hf with 328047 underneath it.
these are some pics of it.
http://s258.photobucket.com/albums/hh250/XxXjackieXxX5659/wade/

[MikeyBC]

"Utah speakers were used in Fender and Supro amps"

Found that quote and pics from Jedistar.com. So it looks like its an electric guitar speaker

[ultrasonic]

thats realy strange because the person i got it from was not useing them for that, he was using them for strictly audio, he made his own custom cabinet for them.

well thanks for helping,