Unity Horn Module

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Unity Summation Aperture:
No Black Box Required

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Front View Rear View Side View


This patent-pending technology is based on utilizing a pyramid-shaped, multi-band wave guide, to properly combine the amplitude and phase from a multiple number of drivers into a single coherent, time aligned, acoustic output. It is in effect a 2-way horn, 5 driver system including a simple passive crossover network that effectively acts as a single driver on and off axis. Unlike similar sized enclosures, the 16-inch square horn exit provides an essentially constant 60 x 60 degree pattern down to several hundred Hz. Using this technology, more of the sound is aimed directly to where the cabinet is pointed minimizing side and floor reflections. This benefit assists in controlling sound in highly reverberant rooms or where the maximum preservation of a recording's stereo image is desired.

Key Benefits of Unity Summation Aperture

Clarity Unmatched voice intelligibility and precise music reproduction.  This is the only multi-way design to accomplish such in both the on and off axis response.
Controlled Directivity 60 x 60 dispersion pattern provides superb energy time curve response over an extended bandwidth while lowering undesirable side wall and floor reflections from reaching the listener and clouding the sound.
Frequency Response 300Hz ~ 18,000Hz + or - 3dB for B&C version

300Hz ~ 22,000Hz + or - 3dB for TAD version

Efficiency 103dB @ 1W1m with an 8ohm load for B&C version

108dB @ 1W1m with a 10ohm load for TAD version

Unparalleled Performance Very low distortion, very high output.  Consider at even 116dB each 5" midbass is receiving only 1W, the power compression and harmonic distortion levels of the speaker rivals those that only amplifiers could previously attain.
Dimensions 16.5" x 16.5" at the mouth outer lip, 14" deep overall, very small size for such high performance.
No "Horn" Sound! Due to the large radiating area of the 4 midbass drivers, the "horn" sound has been eliminated in this advanced patent pending design.


PRICING (each horn module)

Unity Horn Module with B&C Tweeter $1590 each

Completely assembled and fully tested module includes everything to cover from 300Hz and up.  8 ohm load, 103dB at 1 watt

Unity Horn Module with TAD Tweeter $3290 each

Completely assembled and fully tested module includes everything to cover from 300Hz and up. 10 ohm load, 108dB at 1 watt



(and some good talk about the Unity speaker)





A few of the posts and emails direct from inventor Tom Danley describing the Unity and how it works.


Until July 1st, you can get introductory KITS of the above modules!

See below for the extremely low pricing on the kits, but hurry, after July 1st these will become a distance memory!


Please do not ask for raw wood pieces, plans only, kits without drivers, kits without crossover parts, kits without horns, etc., we do not sell them this way!

The only exception to this is the TAD kit which can be purchased without the TAD drivers.  This is because the TAD 2001 can many times be found much cheaper used on the web.

All kits use Axon 630V capacitors, ERSE 14 awg steel laminate inductors for series circuits, 19 awg air core inductors for parallel circuits, and MIL-R-26 resistors with a super low 50ppm temperature coefficient for the resistors.  We have found these to be the best available without all the mumbo jumbo BS.  If you want to change these parts, you are more than welcome to, but at least you will have a baseline to compare against.



Kit with Radian Driver 110dB@1w, 10W maximum peak input level recommended, use when the extreme sensitivity is needed such as a WE417 spud amp in a bi-amp system.  Response is rougher compared to the B&C and TAD versions.  The Radian had a high failure rate in high power applications with Servodrive and as such we recommend it only at this conservative power level and will not carry Radian after July 1st.  $795 each horn
Kit with B&C Driver 103dB@1w, 8ohm impedance, highest power handling, better midrange and flatter response than Radian high sensitivity version, best all around version. $795 each horn
Kit with TAD Driver 108dB@1w with a 10ohm minimum impedance, Cream of crop, best overall sound, the TAD is a unique driver with exceptional performance, be forewarned - replacement diaphragms are expensive at ~$400 each $1495 each horn
Kit for TAD Driver (driver not included) Same kit as above but without the TAD 2001.  Usually these TAD 2001 drivers can be found on the web used for $400~500 each.  This kit includes everything needed except for the TAD 2001 drivers (it even includes those hard to find metric mounting studs!) $695 each horn


Kit Options


Add full assembly to horn, includes black texture paint on inside and outside (see above pictures) full testing, and individual performance graphs (priced for each horn) $200
Change tweeter crossover capacitors from 630V SCR type to Hovland Film and Foils for TAD 2001 (priced per horn) $60


Kits include assembled wood lense and all parts needed including drivers, crossover parts, screws, brackets, etc.  Horn is sanded to 220 grit internally and 100 grit externally, user will need to finish horn via either polyurethane, oil, paint, etc.  Kit prices do not include low pass crossover to bass unit but do include high pass filter for horn (1st order electrical forming a 4th order acoustical)  


We test all compression drivers before they leave our facility, use caution when switching cables, etc.  All tweeters are very delicate and cannot absorb large pops or input surges like this.  Replacement diaphragms for each of these tweeters are very costly compared to other tweeters. 




While it is a complete kit, you must have some assembly skills and basic tools.



Many have asked about what to mate the Unity with below 300Hz

Highly recommended are the TD15 woofers that can be found here.  Other choices that I would consider trying (but have not done myself) are EV15L or any Altec 15" or 16" with an Alnico magnet.  You want the woofer to be smooth up to 600Hz minimum, and preferably want a low inductance, smooth midrange woofer like any of the above.  I would not recommend our PL Series drivers, or any other of the currently popular large displacement SUBwoofers on the market.  You need to think of the woofer as a MIDBASS, it needs a good lower midrange response up to at least 600Hz and preferably much higher.

You want to use a 4th order ~Linkwitz-Riley filter around 300Hz.  Final specs for the parts will vary with the woofer (s) used and the cabinet size and shape, but here is a general starting place for an 8ohm load;

+ ------ A ----- B ------  +

            Amp                     C        D              Woofer

-  --------------------------  -


Series to the Woofer A=7.5mH   B=4.0mH

Parallel to the Woofer  C=100uF  D=24uF

Of course you should plan to possibly adjust these some to suit the design you make, this is just a starting point.


Copyright 2001, Lambda Acoustics Inc.

Copyright 2001, Sound Physics Lab Inc.