1987 - 2017: Thirtieth Anniversary!
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PRO 031 Woofer
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 treated vacuum-formed fiber cone, and a butyl rubber surround.
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.
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"|
|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