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Old 13th March 2015, 04:26 AM   #1
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Default Help with boxes for drivers

I recently picked up some Fane 12" drivers that looked promising. They are built similar to a Tannoy Dual Concentric driver with the tweeter in the center of the woofer cone.
My problem is I don't understand the concept of applying the TS parameters to design a box. I could sure use some help with this.
The TSPs for these drivers are as follows >>>

Fane DX12HE T/S parameters

rozměr: 12" "
impedance: 8 ohm
dostupné impedance: 4 8 ohm
citlivost: 100,0 dB/W/m
příkon: 200 W
rozsah: 50 ÷ 5 000 Hz
Fs: 57 Hz
Re: 5,40 ohm
Le: 0,88 mH
L1: 0,76 mH
L2: 1,61 mH
R2: 5,29 ohm
Qms: 5,96
Qes: 0,400
Qts: 0,380
Vas: 52 litr
Mms: 63 gram
Cms: 120 um/N
Bl: 19,6 Tm
No: 2,37 %
SPLref: 95,7 dB
EBP: 143
Sd: 480 cm2
Vd: 154 cm3
Xmax: 3,20 0/pk mm
Hvc: 15,90 mm
Hag: 9,50 mm
otvor: 281 mm
indukce: 1,30 T
cívka: Cu 64 k mat./mm
magnet: ferit
materiál koš/kryt: Al
hmotnost: 7,20 kg

Obviously this information is not in English but I believe it is obvious enough once read.
My questions are these. How big should the box for this driver be? What size should the port be (if necessary) and how long should the duct inside the port be?
Any help would be greatly appreciated.
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Old 13th March 2015, 12:54 PM   #2
IG81 is offline IG81  Canada
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Are you familiar with modeling software such as WinISD? Playing around with various drivers in these will give you an idea after a while.

Fs, Qts and Vas are usually good enough to "tell the story". In your case, Qt=0.38 suggests suitability for a vented alignment. Fs=57Hz (relatively high for a 12", but somewhat normal of high-efficiency pro drivers) and the medium value of Qt lets us know that a well-damped bass alignment won't go very deep, but this is typical of pro coaxial drivers. Vas can give a clue as to how large an enclosure the driver "wants", not to mean that Vas is the required enclosure volume, it's relative to other factors. Vas=52 liters is not very high for a 12", but again, normal for this type of driver and its intended application.

I plugged this data in WinISD. The default box suggested is about 40L tuned to 60Hz, where f3 and f10 are 61Hz and 47Hz respectively - fair enough IMO. A 4" diameter vent should be 3.75" long in this case. If you plan to use an tube amp with ~2ohm of output impedance, or figure about that much from Xover components DCR, 60L tuned to 45Hz looks decent, with f3 and f10 moving down to 53Hz and 34Hz. A 4" diameter vent should be 5" long now.
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Old 13th March 2015, 01:06 PM   #3
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Location: Calais, ME
As IG81 suggested, optimum ported is about 40L. If it's too small, you can increase the volume to 60L.

From the specs, it looks like it's designed to be used with a compression driver.
Attached Images
File Type: jpg FANE DX12HE.jpg (73.9 KB, 24 views)
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Old 13th March 2015, 01:13 PM   #4
IG81 is offline IG81  Canada
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This driver seems fairly uncommon and one of the first-page hits from Google is a "Sold" add from Canuck Audio Mart back in Sept.'14. I'll venture a guess that hamradioman is the lucky recipient of this fairly good deal - including compression drivers - mind you.
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