DCM Time Window 1 questions

Significantly less than $1000. They cost less than that new.
I owned them when they were all the rage in the 70s.

I have seen pairs sell for $200.00 to $250.00, which seems quite fair. The sound is a bit thick and rolled off compared to current production 2-way bookshelf speakers such as the Paradigm and PSB models. But it is a big sound and is quite nice. A friend has a pair that I purchased and they are still working fine without any issues. I really don't know what the minimum amp power would be as you do not list the size of your room or your musical tastes, but they are reasonably sensitive.

I think Viridian pretty much nailed the sound and average used price.

I have a very early pair of Time Windows. The value will depend on the condition of the drivers - they are a pain to get the cloth off and back on. You should be able to buy a perfect pair for $200-$300. I'm currently running them with 100wpc...but have used as little as 40wpc. I wouldn't worry too much about power, but anything less than 30wpc won't allow them to sing.
Larry

I owned a pair purchased in 1980 for $660. They had a slightly colored midrange that could be improved by raising them on 9 inch stands. One manufacturer sold wrought iron stands that were formed to fit the uniquely shaped base of the speaker.

They used modified Philips tweeters and received a good review in The $ensible Sound as being smooth with good imaging.

I would think good inexpensive speakers today would sound brighter in the treble, but the TW's would still sound enjoyable.