NX-Otica Kit (Pair)


Due to supply issues, we no longer have Miflex or Gen 3 Sonicap bypass caps available.

The NX-Otica is a pinnacle of open baffle loudspeaker designs. This model excels in all areas from top to bottom, and can compete with or be compared with any speaker at any price point.

The price of this kit includes the cost of flatpack for this speaker, along with the shipping costs for the flatpack within the USA & Canada.
Additional funds may be required for shipping the flatpack to other international locations.
Shipping/Duty/Taxes for the rest of the kit (drivers, crossover parts, etc.) are not included in the price.

Speaker Dimensions:
L: 20″
W: 17″
H: 54″

Efficiency: 93dB @1W/1M
Frequency range: 50Hz-20KHz
Impedance: 8 ohm (4.8 ohm minimum)

This kit includes 5 sheets of NoRez.

The flatpacks for this kit ship separately from Canada, so they may arrive at a different time from the kit.

The NX-Otica is a pinnacle of open baffle loudspeaker designs. This model excels in all areas from top to bottom, and can compete with or be compared with any speaker at any price point.

The NX-Otica derived from a model called the X-Otica. The X-Otica is to be the next model up in the X -Series product line. See the development here: https://www.audiocircle.com/index.php?topic=138007.0  Testing of the prototypes with pictures are on page 2. The next thought was to replace the tweeter with the Neo 3 pdr tweeter to make the whole speaker full open baffle from top to bottom. And then offset the tweeter into a wave guide to time align it to the mids so that it is in phase from both sides (front and back). That is what started the NX models. It was the X-Series model with the Neo tweeter.

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 four standard M165 woofers wired in a series/parallel configuration.

Sensitivity is 93db 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 for the tweeter offsets the playing surface of the tweeter to be physically aligned to the voice coils of the mid-bass drivers. So the drivers are in phase on both sides of the speaker. The wave guide also helps to control the directivity of the tweeter and produces a very even and consistent response in all directions. The wave guide also allows for a low crossover point to the mid-bass drivers. So vertical off axis movements don't cause time delayed cancellation. This makes the vertical and horizontal off axis responses very even and consistent.

Testing and development of the concept started here: https://www.audiocircle.com/index.php?topic=138009.0

Final prototype testing and pricing of the kit can be seen here as well as measured responses: https://www.audiocircle.com/index.php?topic=141654.0

Here is a NX-Otica build thread:https://www.audiocircle.com/index.php?topic=143221.0  There are quite a few builds out there.

NX-Otica's in black with dual servo subs per side: https://www.audiocircle.com/index.php?topic=139480.msg1645451#msg1645451

And here are some links to variations available: https://www.audiocircle.com/index.php?topic=153434.msg1640026#msg1640026

The -3db of the bottom end will vary from room to room and can be as low as mid 40's or as high as high 70's.

For handling the lower ranges our open baffle servo subs are highly recommended. See our open baffle servo sub package models 3, 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

The flat packs are shipped from Oroville, WA and there is an additional $200 fee for handling, packing, and shipping of the flat pack.

Additional information

Weight 65 lbs
Dimensions 22 × 17 × 17 in
Sonicap Upgrade for Mid Circuit

None, Sonicaps

Foil Inductor Upgrade for Mid Circuit

None, Foil Inductors


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Crossover Response

Vertical Off Axis
Impedance Sweep

Horizontal Off Axis

Spectral Decay
Impedance Sweep After