DCM TF-400 info wanted

I just picked a set of these up from our local CL. Guy said he was the original owner and they appear to be in excellent condition, although I haven't had a chance to hook them up yet.

I remember hearing about these years ago, but have very little knowledge of the speakers so I wanted to see if any of you are familiar with these and if so, I'd appreciate any info you can provide, i.e. when they were made, good equipment matches, etc. In general just wanting to find out what I can about the speakers.

Thanks.