Thiel Owners

"Pistonic motion" does not.

To be fully accurate:  at a high enough frequency most cone drivers eventually have break up modes where the driver no longer functions as a piston.  It is the speaker designer's job to account for this in picking the driver and low pass filter.

There is no "true piston" vs. not designation in traditional drivers, just what range and what output levels they remain pistonic in.

The exception that proves the rule though are the Ohm type drivers, which are decidedly NOT pistonic. I believe they are fixed at one end, and driven at the other.

Just out of curiousity - anyone try this?

https://www.ebay.com/itm/153963516829#viTabs_0

@cascadesphil 
I cannot imagine modifying the filters for the CS3.7 (really, any speaker but especially first order designs) based on John Atkinson’s quasi-anechoic measurements! That’s whack.

 I actually exchanged messages with that ebayer (his ebay history is spotless!) as I was buying my 2.4SEs. He had an ad for tweaking the 2.3 and 2.4 XO. I was flirting with the upgrade idea even before exchanging ideas with Tom Thiel. I am super glad I worked with Tom instead! 

Maybe it's just my ears, but I haven't heard the harshness described in my 2.7s

Poor recordings can emphasize sound in that region. 

YMMV

cascadesphil

I believe that one of the Panel members reached out to Rob Gillum regarding those filters? The answer was not to change any of the OEM parts.

Happy Listening!