Thiel Owners

Here is just a link to the graph of left speaker (5ft), right speaker (5 ft) and both speakers (16 ft) Same signal sweep for each measurement.https://drive.google.com/file/d/17Ft6xYyKt7vg--wdn5KplLU0Y5hZ7b4s/view?usp=sharing
More detailed info if you download data file for REW.

Good to see you - dsper
Nice system. I hope one of the guys here or Rob Gillum may be of service to you. Keep us posted on this development.
Happy Listening!

thielrules, troubleshooting is a hands-on undertaking. I'll speculate a little, but the problem needs actual triage, both speakers and the eq.
The deep bass looks like the green channel has the eq and the red channel does not: textbook 12dB/octave rolloff. The red channel from 80 to 300 might be a woofer problem or the bottom end of the midrange phase-lagging causing that periodic (cancellation?) pattern. Of special interest is the combined blue output from 250 to 1K is lower than either speaker. This graph implies phase / polarity issues in the red speaker or the eq.

I suggest you take out the eq, change cables, measure each speaker in the identical room location, swap amp channels, etc. to gather meaningful troubleshooting data.

Perhaps you can arrange an appointment with Rob to send him your preliminary data beforehand and take your speakers when he's ready to put them on the bench.

dspr, my recollection (unreliable) is that there were no electrolytic caps in the CS5. Film caps are stable or get better with age. I'll keep an eye and ear out to confirm my suspicion. Does anybody know?

Tom, your response is greatly appreciated. I have an extra woofer but it sounds like there may be more wrong. The equalizer was just serviced a few months ago and that was what started me to examine this more closely. Thanks