Quote Originally Posted by Feanor
Accepting the 18 dB corner boost for "low" notes, then the numbers are more or less plausible.

The closest standard Seas 8" woofer is the Presitige CA22RNX, (here). According to my Bass Box Pro program, in a 2.7 cu.ft box, (about the size of AN's), the -18 dB point is about 16 Hz. (This make sense since the -3 db point is around 31 and the roll-off for a standard vented box is 18 dB/octave.) So AN's spec is arguably conservative stating -6 dB at 18 Hz.

On the other hand with the steep 18 dB/oct roll-off it's pretty difficult to imagine a smooth compensation with corner placement -- what is the roll-off of Donald North's 18 dB boost with rising frequency??? For me it's easier to imagine setting up for smooth response with the closed box AN-K model with a 6 dB/oct roll-off. BassBox estimates a -22 dB at 17 Hz for the same woofer in the AN-K's approx. 1 cu.ft box-- yet for that model AN makes the much less extravagant claim of "50 Hz to 20 Hz (-6 dB)".
Peter unfortunately doesn't much care about the website - it was created by a fan of his stuff - 2 points -

1) the 8 inch woofer you linked does not look much like the AN woofer so we can't be sure it's the same - it is possible that when AN says it's a custom woofer that it truly is a custom woofer and they don't make it for anyone else. For instance there is a Tonnegan tweeter that AN uses but AN has had all the Ferro-Fluid removed - the speakers are air-cooled and there is a completely different magnet on the speaker. That's a big custom change so while you can buy the shell it's not really the same. Also, the AN E woofer is not a long throw woofer so if you see any of those cross them off consideration. Hemp, not long throw, foam surround.

2) The AN K is rated free standing according to Peter and not corner loaded like the J and E. I asked him on another forum about this and I can't remember why he said he placed a spec for free standing position. According to Peter in a corner the AN K is 36hz -6db. I also know that he is not entirely happy with the AN K in the sense that it has some compromises in the speaker that he was forced to make due to the size of Audio Note as a company. For instance he wanted a foam surround for the AN K but to get that driver he would need to order 500 pairs at a time. So he is using a rubber surround. That is an upgrade to make for the K. I think there are plenty of things he would do personally to a lot of things but it has to fit an end price that has some possibility of sale. I think the majority of companies are in the same boat.