I bought the original first version DCM Time Windows speakers when they came out in the late 70's, for $660. I live in southeastern Michigan, not far from Ann Arbor, where DCM was located. They were driven by a Kenwood KA-9100 integrated amp, and I have many great memories of how good sounding the DCM Time Windows were. Unfortunately, the system was stolen from my house about 5 years later.
Around 2008, I happened upon a mint pair of the first version DCM Time Windows selling nearby me, and bought them for nostalgia reasons. I then sold them a year later to my brother, and he is still using them to this day, sounding very musical in his furnished basement.