Yes. He claims a 20Hz extension without specifying an F3 point for that design. IIRC, he claims an incredibly flat response from around 70 or 80Hz on up... something like ±1dB?
With all due respect... this is why I don't buy it. These specs, without third party testing to back it up, are pretty much
too good to be true.
Thus far, I haven't really nitpicked. In fact, I encouraged our friendly OP to pursue them while making certain he educates himself as any good consumer should!
I disagreed with you before because the one testing I heard of clearly sparked a controversy between NRD and Eric. Those measurements were pulled down from NRD's site, and based on the tenor of the details I did see, I get the feeling that legal action was threatened.
So... Where does that leave us? I'm not bashing Eric or his speaker design. I'm not bashing your choice of speaker. I do, however, disagree that his designs are
exactly all that he claims, and I would also be concerned about how much current those guys need from the Amp stage of an AVR.
This latter point is important: 2 10" woofers are certainly capable of delivering great bass. They will require a good deal of energy, too! In fact I would rather see a plate amp on the DIs to offload that low end from whatever Amp may be powering them.
Also, the results of the DI Monitor tests from Stereophile did show that the Sensitivity claim was seriously overblown: 87.5dB measured vs 94dB advertised. Though they don't call it out specifically, I see some steep Phase Angles, around 45º, at Low Impedance from 60-90Hz. With a true 4-ohm Amp, it might not be problematic, but it did raise concerns about what was actually happening in his other speakers.
I won't spend 3K on what-ifs!
Mind, I was in conversation to buy 11 channels + Subs from Eric and was days from flying to UT to meet him and audition his gear.
Instead I have towers that are ±2dB from 25-20000Hz. The design is well documented and measured. Not only do I have no regrets, but I know I bought one of the best speakers available, at the time, in terms of cost to performance. They perform admirably without subs, and the Transmission Line design is amazing. Yet, I still cross these towers at 80Hz because of the additional clarity in Mid and High frequency that results in offloading the bottom octave to my Subs. Well, that, and I listen to enough material with true infrasonic content that it doesn't make sense to risk those Scan Speak Woofers to an over-excursion accident.
Cheers!