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The long-awaited HUMAN 81 DK is now available.
Best viewed in "landscape" mode.

HUMAN K-81 Speaker Kit
$363.00 / pair

Building speakers based on classic designs:
HUMAN 81 or 81+; EPI 100 or 150; Epicure 10; Genesis I, 1+, 1 or 10
(back to kit/legacy projects)
See the gallery of projects below

PRO 005 woofer
PRO 002 M2 tweeter

The most successful speaker Epicure Products ever built, and for good reason, was the EPI 100. Using just an eight inch woofer and tweeter that were designed from scratch to work together, it provided a seamless, balanced musical experience in a small package, and at a very low price. (The epicure 10 is essentially the same speaker as the EPI 100.) The EPI 150 used the same parts, but took advantage of the capability of the woofer to achieve lower frequency extension when used in a larger cabinet, for those who didn't mind giving up some more space for them. The Genesis I, 1+, 1 and 10 worked from the same principle with similar drivers. Guess what? My HUMAN 81 and HUMAN 81+ do too!

This project, then, includes a variable. The volume of the cabinet can be anywhere from one half to as much as two cubic feet, and you can experiment creatively with cabinet shape and dimensions, given the range of "opinion" expressed by these wonderful forebears to your project.

The crossover used by EPI and HUMAN is just a single ten microfarad capacitor (I use a high quality metallized polypropylene film capacitor) in series with the tweeter. Some Genesis models also added a shunt coil, with varying alignments - these "second order" networks were intended to decrease the power "seen" by the tweeter below the roll off frequency. Since this comes with a penalty in the linearity of the phase response, I prefer to use the single capacitor design myself.

Specialized Versions

The K-81E is a special edition of this kit, intended for rebuilding first generation EPI speakers such as the M90, M100, M110, M150, etc. The tweeter is built on a 5" diameter faceplate - the PRO 002 ME1 or the 4-3/8" PRO 002 ME4 in some cases, and the input terminal/crossover/wiring assembly is built on a board that is screwed inside the rectangular opening in the original cabinet (the ACC 004 A). It also features the very long throw and updated replacement woofer, the PRO 005, and if your old grills were nailed or glued on, I include some Velcro to reinstall them.

The K-81AP is similarly a special version, intended for rebuilding the Advent Prodigy tower speaker. The tweeter is built on a custom faceplate designed to match the original mounting location and cutout, and the input terminal/crossover/wiring assembly is built on a cup that matches the rectangular opening in the original cabinet, after the through-hole is enlarged somewhat.


Interior dimensions in inches, volume in cubic feet:

modellong faceshort facedepthvolume
Genesis 117.5960.55
HUMAN 8116.751060.58
EPI 10019.59.570.75
Genesis I19.510.570.83
Genesis 1+20.51181.04
Genesis 1021.5118.51.16
HUMAN 81 DK171012.51.23
EPI 15023.513.591.6
HUMAN 81+309.5122.0

Stock bracing: None (except HUMAN models). I recommend adding at least one brace front to rear at the point between the woofer and tweeter cutouts.

Driver position: Offset from center of cabinet face, tweeter a different distance from the top than the sides, drivers as close together as practical.

The HUMAN 81 Kit includes:

2 PRO 005 woofers
2 PRO 002 M2 tweeters
2 Terminal cups with gold plated 5-way binding posts
2 Complete wiring harness/crossovers
Screws to install all parts
Pegs and sockets for grill mounting
Basic instruction sheet (and telephone/email support)

You provide:

The cabinet
The grill, if desired
Internal damping material (e.g. fiberglass, polyester, etc.)

81/81+ and 81-10 Kits

thumbnail linkSteve recycled a pair of ElectroVoice cabinets for this pair thumbnail linkRod built these using American walnut
thumbnail linkAl built these to match his 88-41s thumbnail linkRuss used the parts from his 81s to make these
thumbnail linkFred's 81-10s and story thumbnail linkTwo slightly different pairs in Thailand
thumbnail linkA pair of carpet-covered ones I built thumbnail linkBrian in Tasmania made some lovely examples
thumbnail linkA work by artisan Jeffrey Cooper titled "Acoustic Impressions" thumbnail linkA customer had me rebuild his Advent Prodigy towers, leading me to offer this upgrade package as a kit
thumbnail linkJimbob recycled a pair of Altec-Lansing cabinets for his first pair thumbnail linkJimbob's next project involved making some EPI 100 clones
thumbnail linkIan made a single 81+ as a center channel to go with the 1000s he built years before. thumbnail linkRuss B built this beautiful pair of 81-10s
thumbnail linkDave S. in NJ built these lovely cabinets. thumbnail link2021: Tyndall built these delightful examples.
thumbnail linkI rebuilt these cool looking but pre-hifi EMI speakers into something special. thumbnail linkWe are going to make these Pioneer speakers a lot better.
thumbnail linkIn early 2022, Ben put together yet another superlative pair of HUMAN kit-based speakers.

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