I picked up a couple K120s at reasonable price on eBay.
There is a seller on eBay that is reconing D123 or similar frames for guitar.
After reading Harvey's comments about the D123 I got one. This is a nice sound guitar speaker. Better bass than the stiff coned D/K/E speakers, but not as much power. I'm having this person recone a E120 into a bass speaker, I will report back when it's finished. :) John
There is this speaker by Beyma
http://www.usspeaker.com/beyma%20liberty-1.htm
I have not listened this speaker, but I have do have some other Beyma speakers and they sound very similar to JBLs.
However used JBLs D/K/E 120 can be found for less than this speaker's new price. John