George,
What have you used the PT with?
They do smell a little so I use them in summer (so I can have a slightly open window, like you do with gas heating) with the ML esl Monoliths (with replacement Neolith panels), and roll off the esl panels at 5khz and bring in the Magnet MP-02’s. Which go out flat it said to over 50khz with no problems.
They really do add even more "air", delicacy, 3d transparency and speed to the sound than just the esl’s, which is unbelievable, as that’s esl’s best traits.
https://magnathifimuseum.wordpress.com/2015/04/27/plasma-mp-02/
Cheers George