Thiel Owners

Ron, I see from the XO schematics that the higher input sensitivity of the 3.7 is due solely to its more efficient woofer. The 2.7 coax has resistors to pad it down to a less efficient 8" woofer with the same coax. No satisfying answers yet.

thanks Tom,  that is interesting if i understand correctly about the resistors.  when i sent back the last damaged coax to Rob,  he sent the replacement back with a resistor on the positive terminal.   to the best of my recollection,  none of the others had that resistor.  could the lack of that resistor make the drivers more prone to damage?

Ron, I don't have enough history to comment on your situation. I am far away and out of touch and coalescing probabilities from sketchy evidence. The detailed lab records are MIA and most of what we know is in Rob's memory. I am gradually back-engineering XOs and timelines from photos, previous suppliers input and whatever Rob sends me. Rob says that Thiel built all 2.7s in Lexington under his supervision, so he knows far more than I do.

The schematic that I created from an engineering layout shows the tweeter with a parallel pair (20+3) netting 1.3 ohms in the tweeter series feed. It is possible that value was adjusted over time. Rob would know his rationale and I do not.

Excuse me, that's 2.6 ohms.
TT

hi Tom,  my  understanding of this is bare bones at best.   i did replace a few coaxes and do not remember seeing any with a resistor on the positive terminal.   could that be a reason for my proclivity to blow drivers?  When i sold my 2.7's i sent the extra coax that i had for it and it did have the resistor as it was my back up driver.