I have one that someone just gave me(it was empty)! These appeared mid-to-late 70's, and provide long-throw projection for mids and high-end, although there is a low-frequency port, I can't imagine, with the limited internal box space, that much in the way of low frequency waves could be built up. John Entwistle used these cabs as the top-end of his Sunn "wall-of-bass" rig in the late 70's; the low end was provided by Sunn folded horn cabs. Go find a copy of the "Kids Are Alright" movie, and you'll see the cabs in the live segments of them(filmed in '78)playing "Baba O'Reilly" and "Won't Get Fooled Again". You might want to put newer, higher-powered speakers in it...interesting application for guitar. This cabinet is actually based on PA cab design. Let us know how it works out. I'm planning on installing two Carvin 12" bass speakers(actually Eminences)to make it the top part of my bass rig!