Thiel Owners

Have you tried here?  

I'd be reluctant to drive Thiels as the main channels with any AVR.  Driving Thiels as surrounds with a receiver rated at 4 ohms shouldn't be that difficult as typically the DSP in the receiver re-directs the bass to the sub or subs.  I have an integrated AV system (my main system) with an outboard amp driving my 3.7s and the receiver (Onkyo TX-RZ 31000) driving the remaining channels, including a Thiel MCS1 center and Thiel SCS2s as the side and rear surrounds and Thiel Power Points as the front Atmos channels.

"The test mic will give the software roll off points I assume?"  One uses the mic with pink noise (there are free downloads as well as test discs).  I usually measure with the subs turned off.  In a room bass frequencies sum.  So one does not want to have the main speakers producing the same frequencies as the sub and causing a bass bump at certain frequencies.  So note where the mains start to drop off and set the Rel accordingly (I currently have a pair of Rel S/812s in the main system) and then test again and get it as even as possible without peaks and dips in the lower frequencies.  I also use room treatments.

There's some info about specific (to the review pair) serial numbers in this 1999 Stereophile review around the same time frame - https://www.stereophile.com/floorloudspeakers/220/index.html

Later on, Thiel changed the tweeters to vented ones (although I'm not sure of the exact date (probably around 2004).  My friend worked at a high end shop and I generally did all his set-ups with him, including changing 2.3 tweeters (I owned 2.3s many moons ago).

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Hi Thiel speaker aficionado!

I have a question regarding a low frequency powered subwoofer speaker addition to my stereo setup. In my case its the CS2.4 towers and Pass Labs X150.8 stereo amplifier along with one REL S/812 powered sub.

Out of the gate I can tell it’s more than capable of producing more LF than will ever be needed so its in a good location. (front corner facing the listening position directly behind left channel speaker) Connected up via the high level speakon input connection directly from the Pass amplifier to integrate seamlessly with my CS2.4 mains.

Does anyone have tips tricks to get optimal crossover adjustments dialed in perfectly? I’m going mostly by ear and its currently set to 12 o’clock at the level/gain knob and 2 o’clock at the Crossover knob. Phase switch is set to 180"

Measure from the listening position (every room will not be identical).  If you don't have an RTA, Studio Six Digital has an App (called Audio Tools) for IOS or Android and Parts Express sells the Dayton Audio IMM-6 mic (for just over $21) which has an individual calibration file (for the specific mic).  Also, REW (Room EQ Wizard) is free, and Parts Express (Dayton Audio UMM-6) and others sell USB mics for use with REW.

I always look here for items for sale (right now the closest Thiels to Lexington KY are 1.2s in Cary NC about 7.5 hours of drive time) - 

Is the test tone being played by a vinyl record?

Get stands first.  There are methods for dialing in settings (I have a pair of S/812s with my 3.7s).  REM (https://www.roomeqwizard.com/) is free and one will need a USB mic (like https://www.daytonaudio.com/product/1116/umm-6-usb-measurement-microphone) and to run the program.  There's also things like the Studio Six Digital Audio Tools App (https://studiosixdigital.com/audiotools-modules-2/acoustic-analysis-modules/) for use with a phone or tablet along with a mic (e.g. https://www.daytonaudio.com/product/1117/imm-6-idevice-calibrated-measurement-microphone) or use of an outboard RTA (for example I have an old Audio Control R130 like this one - https://reverb.com/item/12254790-audiocontrol-r-130-real-time-analyzer-rta-analog-see-what-your-mixes-sound-like)