Some info I found:
Audiophile DCM QED speakers in very good condition
These are very impressive moderate-sized speakers. Clear, dynamic, very surprising bass
because of their special design.
The wrap-around covers are in medium plus condition and could use a slight cleaning. Th
mid-range/bass drivers have rubber surrounds in good condition.
Tops and bottoms are solid wood that I sanded and oiled to restore the grain. They turned out
quite nice but still have some scratches, not too bad.
8" woofer, dome tweeter, and the "hybrid" transmission line floor standing enclosure.
From Audiokarma:
"I have a pair of QED's. They are fantastic sounding, actually sold a pair of Time Window 1A's and kept the QED's....I must say, the QED's have sounded nothing less than fantastic in my space with either a Rogue Integrated or my current DK Design integrated. "
"The DCM QED is the little brother to the audiophile legend Time Windows. They use the same 6 1/2 inch woofer and dome tweeter as well as the same crossover network as the Time Window. But, w the Time Windows have the V-shaped front with drivers on each plane, the QED has the drivers mounted on the single front baffle. Both speakers use transmission line loading, and both are famous for their incredible imaging capabilities."
From the ad of another EBay seller:
"DCM was a speaker company located in Ann Arbor, MI, under original ownership from 1974 to 1999. They are famous for models such as "Time Windows" and "Time Frames." They were early experimenters, along with Bose, in omnidirectional ambient sound--their larger systems have multiple drivers facing in different directions to produce reflected sound. But, the most unusal characteristic of many of their speakers is "transmission line" design. Transmission line speakers have ports, but unlike common ported speakers they are not tuned to produce reinforcing sound through the port. Instead, the port is extremely long--the interior of transmission line speakers are often designed as a labyrinth, so that sound from the drivers has to travel several lengths of the cabinet they are in. The transmission lines are damped with acoustic sound absorbing material, and their purpose is to kill cabinet resonances. Various audiophile companies, like B&W and Von Schweickert, have experimented with transmission line designs, but DCM consistently used them. Unlike ported and closed box designs, it's not possible to do computer modelling of transmission line designs, so they are really artisan products. I've found the DCM speakers I've listened to to be extraordinarily clean sounding, so the transmission lines are doing their work.
The QEDs listed have a single 8" woofer mounted at the top, a tweeter below it, and a port opening at the very bottom. The cabinet is a labyrinth, and the port length is about 5'....
They have been described as "half Time Windows," which have two woofers and tweeters, and much larger cabinets. These are much easier to position and to ship. Speaker connections are made through a pair of banana plug jacks at the bottom rear. (these were manufactured as carefully tuned matched pairs)."
Dimensions: 36" H x 11 1/4" W x 9 1/4" D
Weight 38 lbs.