Questions?
Call 603 659 5335 or email me

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

Replacement/repair part number PRO 005
$87.00 each

This is an improved replacement for the 8" woofer used in these Genesis Physics loudspeaker systems:

Its internal reference number (on the sticker, if it has one) is SW10P.

What's different and why:

Butyl rubber surround: increased longevity, lower resonant frequency (the top of the line Genesis 410 and 66/2 were made this way).
Sealing gasket attached to rear mounting surface: easier to use (discard your old gasket).
Acoustically inert dense EVA "gasket" on front: makes packaging simpler, more attractive.
Round magnet structure: identical in weight and function (most later Genesis woofers were made this way).
Extended pole piece: not visible, but improves linearity.
There is no longer a cardboard ring on the back full of epoxy. The basket I use does not need this to prevent the steel from "oil can" behavior at high power levels

Voice coil: the long voice coil winding is critical to linearity, and its high inductance is part of why the woofer does not need crossover circuitry to roll off the high frequencies.
Magnet weight and strength, field guide (yoke) plates: again, a critical part of the design
Cone material, weight, and density: the exact design of the cone is also part of how the woofer rejects high frequencies on its own.
Treated cone: seals speaker system better, more attractive, less change due to humidity.
Treated cloth dust cap: looks better than the exposed wires on most older woofers.
Rear suspension compliance and travel: allows full linear cone excursion
Free air resonance: although not a "part", the low Fs is important to the extended low bass response.

Here is a picture of the parts I use to build it:

7 Kelsey Road, Lee, New Hampshire 03861