The price is per pair.
The kit comes with everything needed for the build. You get all the drivers, high quality crossover parts including Sonicaps, Erse inductors, and Mills resistors, high purity OFC wire, heat shrink screws, solder, screws, tube connectors, and nine sheets of No Rez. It even comes with a CNC cut flat pack. That's a complete set of cabinets in raw MDF that just needs assembly. These can be veneered or painted in any way for any look. Pictures of the CNC cut flat packs can be seen here.
Like NX-Otica the tweeters used are the new GR Neo 3 tweeters. The mids used are the 16 ohm M165NQ drivers that were designed just for this type of open baffle application. And covering the lower ranges are eight standard M165-16 woofers wired in a series/parallel configuration. So the bottom end is extremely tight and clean.
Sensitivity is 94.5db and the impedance is a nominal 8 ohm load. So they can be easily driven with small tube amps or chip amps.
The 1.5" deep wave guide that the tweeter uses not only controls directivity, but also moves the voice coil of the tweeter back enough to physically align it with the voice coils of the mids. So they are physically time aligned on both sides of the speaker. This means the speaker maintains a high level of accuracy on both sides. This achieves a very accurate room response. The wave guide also allows for a low crossover point to the mid-bass drivers. So vertical off axis movements don't cause any time delayed cancellation. This makes the vertical and horizontal off axis responses very even and consistent.
The -3db of the bottom end will vary from room to room and can be as low as low 40's or as high as mid 70's.
For handling the lower ranges our open baffle servo subs are highly recommended. See our open baffle servo sub package models 4 and 5 here.
CNC cut flat packs for our servo subs are also available. See them here: https://www.audiocircle.com/index.php?topic=139480.0
See some great pictures and show coverage of the NX-Treme at the Lone Star Audio Fest by Part-Time Audiophile.
Price of the complete kit with the flat packs starts at $3,450 plus shipping. The flat packs are shipped from Oroville, WA and there is an additional $400 fee for handling, packing, and shipping of the flat pack.
The on axis frequency response is as good as +/-2db end to end and within +/-1db over a wide range.