[Vintage-Audio] Can You Identify These Speakers?

[Duane Fischer, W8DBF]

N0ALO writes:	
	
I have a pair of speakers that I want to sell, but need
some information to guess the price. Have no idea of the
value of this kind of stuff.
I assume they are tweeters - horn type speakers. end to end they
measure 11 inches. The flange end measures ten and one half inches
by four inches. Metal of course. They are marked Magnavox 580069-1 and
575452 on both speakers. I put audio to them to make sure they are
still working.
Any ideas?	
	
Sounds to me like they might be for a PA system? Maybe out of a home stereo
somebody took apart?