Thiel Owners

I’m on my way to visit Rob where we’ll audition lots of models including cs7 vs cs7.2. Rob says concrete vs composite are the same. I’ll form my opinion Wednesday.

I just purchased cs 7s I am very happy with them and they are a big improvement over my 3.6s I had.  that being said my bryston 4b is not able to make them  sing like it did with the 3.6s while I’m sure the 7.2s are better for me I couldn’t justify the difference in price And would rather use the money towards a bigger and better amp.  

I was playing around with a three-way mock-up. Basically I use a setup with what I already have. Making the cabinets would just take a lot of time. The tweeter is ScanSpeak AirCir, Seas Nextel 5.5in. as mid, and Scanspeak Illuminator 5.5 in as woofer. I don’t current have a dedicate cabinet for 8in. woofer but the freq/phase behavior should not be that different.

Measurement was done at 1Meter distant between the tweeter and the mid which is about 33in. high. There are quite a bit of ripples on the freq. response probably due to room reflection which also shown in the step response being taking a bit longer time to settle at the low frequencies.

The xover seems a bit complicated, but that’s typical of first order, time-phase coherent, time-coincident speakers. The 50uf cap on the tweeter should only affect the lower freq. so it probably will be OK. Actually I don’t need it there for freq. response, but I put it there to protect the tweeter.

Pic:
https://www.flickr.com/photos/185616271@N05/49129808921/in/album-72157711891600612/

Xover:
https://www.flickr.com/photos/185616271@N05/49129320988/in/album-72157711891600612/

As I said a few posts above, I believe that one of the differences in sound signature of first-order filter is that high order filter, there is a faster change in phase, which results in excess overshoot and undershoot in time domain. And the reasons why were explained in my previous posts.

I here compare different impulse response of different filters. An ideal first-order time-phase coherent has the "best" impulse response. The 3rd order electrical filter has the worst. There are a total of six different filters here:

1. First order ideal
https://www.flickr.com/photos/185616271@N05/49129364003/in/album-72157711891600612/

2. Third order electrical: shows the most undershoot, overshoot:
https://www.flickr.com/photos/185616271@N05/49129853971/in/album-72157711891600612/

3. First Order, No Time-Phase Coherent
https://www.flickr.com/photos/185616271@N05/49130037747/in/album-72157711891600612/

4. Three-Way Time-Phase/Time-Coincident:
https://www.flickr.com/photos/185616271@N05/49129363963/in/album-72157711891600612/

5. Another Three-Way Time-Phase/Time-Coincident:
https://www.flickr.com/photos/185616271@N05/49129363973/in/album-72157711891600612/

6. A Two-Way Time-Phase/Time-Coincident:
https://www.flickr.com/photos/185616271@N05/49130076182/in/album-72157711891600612/

tomthiel

Safe travels to Lexington. Looking forward in reading about your visit with Rob. Have fun!

Happy Listening!