I never heard of felt between speakers and that layout of the woofer behind the tweeter.I own 350s and thankfully resocked and refoamed before I got them.As for foam insulation I was told DCM used to use a headliner type of fabric that degrades over time to wrap their speakers as I guess vibration control or sonic enhancer of some kind.For such a wacky design these speakers are awesome.I know sock speakers should not be in the same conversation of grill covered speakers but as I always have said the Dalquist D-10, AR3a, and now Time Frame any model are the worst looking grill/sock off speakers out there.
Yes, the TF600 has two woofers, the upper one has a metal mesh with felt behind it and a tweeter mounted inside the mesh. It's a configuration that was also found on the CX series of speakers. The lower woofer handles the lower frequencies. The upper one acts more like a mid bass.
The TF350 are not the same configuration as the TF600, at all. The TF350 is a much more conventional 2-way speaker with a tweeter mounted above a woofer, mirrored, and in a quasi-transmission-line enclosure.
The TF600 are much more complex. They are a 3-way speaker with the addition of the two rear-facing tweeters as pictured in the post above.
The speakers are wrapped in a headliner material which is glued to the cabinet. Then the cloth sock is slid on top of that. The headliner material can be found at any fabric store and goes on with spray adhesive and a few staples. The point of the fabric was the reduce diffraction of high frequencies that would bounce off of the front baffle. The baffles were so wide that the high end could get distorted, and the time alignment features of the crossover negated, if the fabric were not there. The fabric also helps prevent midrange frequencies from resonating the cabinet.
Because these are vented cabinets, by virtue of the transmission-line port, inside, they have a minimal amount of acoustic stuffing inside the cabinet. The cabinets should not be stuffed like a sealed enclosure. The stuffing was placed strategically along the bends of the transmission line to minimize low-end distortion.
And I agree, they look like hell with the covers off. But the sound they produce is fantastic.
Finally, ALL of the Time Frame series of speakers were mirrored and should have been sold in sequential pairs, odd number for left side, even number for right. Many times the retailer were just pick a left and right haphazardly. But they should be in series. The Time Window series were NOT mirrored or handed. It is common for the Time Windows to have non-sequential numbers.
thanks Kent
