Yes. I believe that for $2000+ per, the subs should provide ULF down to 15Hz in room and good TR. This is why many have seen me asking the sub owners to keep trying to get lower extension. I cringe whenever I see a FR dropping like a rock below high teens, especially when it is from 2 ported 18s.
Out of all the active posting members in this thread, I have probably owned a JTR sub the longest. At the time when I got the Cap 1400, it was the only ported JTR that would fit in most HTs. Then of course Jeff introduced many outstanding products that continue to push boundaries. I see the 4000 ULF as a game changer. It checks all the boxes for the best ported sub money can buy, and many, if not all, the boxes for the best sealed sub. The 4000ULF can provides the output, the extension down to 10Hz, and the port wind that I want, no, must have! So it does have a special place in my heart.
I also look at the output comparisons between the 1400, 2400ULF and the 4000ULF:
From 16~80Hz, the 2400ULF has about 30% more output, but it costs about 30% more than the 1400. Therefore, they provide the same output per dollar. The 4000ULF costs 70% more but it provides double the output of a 1400. Ding ding ding!!! We have a winner. BTW, it also does 108dB @ 10 Hz...
I really wish I could hear the S1 or the S2 in my HT that provides some cabin gain. However, I don't think I can live without the port wind though.