The long-awaited HUMAN 81 DK is now available.
Best viewed in "landscape" mode.
PRO 031 Woofer
$127.00 each
The PRO 031 is a long-throw ten inch woofer with a one and a half inch diameter bifilar voice coil, a vented magnet structure, a sealed vacuum-formed fiber cone, and a butyl rubber surround.
It is the woofer to use in several Genesis Physics and EPI systems, and also a couple of Burhoe Acoustics models.
It is very similar to the original large Advent woofer, although of course those cabinets are cut for a 12" basket. It also makes a very good replacement woofer for the AR-5.
One very good use it can be put to is in building a modernized clone of the Epicure 3.0 system. This complete set of parts is available as a kit.
It can be used in a sealed box, or paired with the PRO 014 passive radiator in a vented design. I recommend a three cubic foot enclosure for this, similar to the Genesis 410. This yields an F3 of 32 Hz.
This is pretty much what they look like:
| A Outer diameter | 10 1/8" | B Hole diameter | 9 1/8" | C Total depth | 4 5/8" |
| D Magnet diameter | 4 5/8" | E Magnet assy. ht. | 1 3/4" | F Mounting diameter | 9 3/4" |
| G Rabbet depth | 7/32" | H Nominal VC dia. | 1.5" | J Winding length | 0.75" |
| K Gap height | 0.25" |
Note: G, rabbet depth, including front gasket, is 3/8"
| Fs | 18 Hz | Re | 4.25 ohms | Ie | 0.74 mH | Xmax | 0.25" |
| Qm | 3.3 | Qe | 0.37 | Qt | 0.33 | Vas | 128 liters |
Sensitivity | 90 dB/1w/1m | ||||||
| Power | 250 w RMS | ||||||
| Frequency response | 25 Hz to 1.8 kHz | ||||||
According to computers, this is how the PRO 031 performs in sealed boxes:
1.6 cubic feet: a system Q of 0.65 and an F3 of 35 Hz
1.3 cubic feet: a system Q of 0.7 and an F3 of 38 Hz
1.0 cubic feet: a system Q of 0.8 and an F3 of 44 Hz
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