Thiel Owners

Put your preamp in mono if you can.  Even if you can't, both woofers should be moving about the same amount.

You can use the battery to gauge woofer movement. Are both channels moving similarly with the 6 volt signal?

They are both moving a similar amount, about 1/16”

@last_lemming Do you have a way to measure SPLs, confirm your subjective impression? When I rebuilt my CS2.4 crossovers, I was able to compare the before and after frequency response using the SafeNoise app on my iPad and a tone glide.

BTW, not that I think this is your issue but have your tried a set-up with the speakers on the shorter wall? Either way, I suggest taking a look at the Cardas website for some placement ideas to try after you figure out your problem.

I have a pair of 3.6's that are now 25 years old (nothing I heard in all this time makes me want to retire them) and I am concerned about old age issues. Have any of you had problems with the drivers?  I am wondering if it is a good idea to take apart the tweeters and clean out and replace the ferrofluid. Or better yet, does anyone sell the rebuild guts?

Thanks