Looking for spec sheet - Vifa M18WO-09-06

wrankin · 12th January 2011, 05:13 PM

Looking through my box of old drivers, I was thinking about doing something with a pair of Vifa M18WO-08-06's that I had laying around from when I picked them up on sale many years ago. These are the *6*-ohm version of the driver. I was wondering if anyone had the data sheet and could give me the electrical specs? I could only find the sheet for the 8-ohm version.

From what I recall, the mechanical parameters were the same between the 4, 6 and 8-ohm version of this driver.

Thanks,

-bill

gfiandy · 12th January 2011, 06:35 PM

Hi,

A bit of a google search found this:-

Woofer: Vifa M18WO-09-06, 7" midbass, inverted dust cap, cast magnesium frame,
and rubber surround. Again, I couldn't believe the quality of this unit! This driver is
offered in 3 flavors, 4, 6, and 8 ohm versions. Theses are the 6 ohm. I got them
(on sale) at Madisound for $28!

Published Specifications:

Nominal Impedance: 6 Ohms
Voice Coil Resistance: 4.21 Ohms
Nominal Power: 90W
Short Term Max Power: -
Long Term Max Power: -
Operating Power: -
Sensitivity: 88.4 db - 1W/1M
Frequency Range: 35-3000 Hz
Free Air Resonance: 35 Hz
Voice Coil Diameter: 40 mm
Voice Coil Height: 14 mm
Air Gap Height: 6 mm
Effective Diaphragm Area: 132 cm^2
Moving Mass: 17.5 g
Magnet Weight: -
Force Factor: 7.5 Bxl
Vas: 29.1 Liters
Qms: 6.24
Qes: .35
Qts: .33

I don't know if this is good data, its just what the search turned up.

Andrew

wrankin · 13th January 2011, 12:46 PM

Thanks, Andrew! I googled around a bit but could only find specs for the 8-ohm version. I think the only thing missing from the above list is the voice coil inductance. Do you have the URL where you found this info?

I'm just getting back into this and it's been years since I designed my last loudspeaker. I know some of this information I should probably derive from the drivers I have in hand. Looks like it's time to go crack open my old copy of the LDC. :-)

Thanks again,

-bill

gfiandy · 13th January 2011, 09:07 PM

Follow this link to the next link and you really do need to do Ctrl-A to see the text.

Vifa M18WO-09-06 / D25AG-35 help - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com

12th January 2011, 05:13 PM	#1
wrankin diyAudio Member Join Date: Mar 2003 Location: Durham, NC	Looking for spec sheet - Vifa M18WO-09-06 Looking through my box of old drivers, I was thinking about doing something with a pair of Vifa M18WO-08-06's that I had laying around from when I picked them up on sale many years ago. These are the 6-ohm version of the driver. I was wondering if anyone had the data sheet and could give me the electrical specs? I could only find the sheet for the 8-ohm version. From what I recall, the mechanical parameters were the same between the 4, 6 and 8-ohm version of this driver. Thanks, -bill __________________ Bill Rankin

13th January 2011, 12:46 PM	#3
wrankin diyAudio Member Join Date: Mar 2003 Location: Durham, NC	Thanks, Andrew! I googled around a bit but could only find specs for the 8-ohm version. I think the only thing missing from the above list is the voice coil inductance. Do you have the URL where you found this info? I'm just getting back into this and it's been years since I designed my last loudspeaker. I know some of this information I should probably derive from the drivers I have in hand. Looks like it's time to go crack open my old copy of the LDC. :-) Thanks again, -bill __________________ Bill Rankin

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12th January 2011, 06:35 PM	#2
gfiandy Audio Engineer diyAudio Member Join Date: Jul 2003 Location: Cambridge UK	Hi, A bit of a google search found this:- Woofer: Vifa M18WO-09-06, 7" midbass, inverted dust cap, cast magnesium frame, and rubber surround. Again, I couldn't believe the quality of this unit! This driver is offered in 3 flavors, 4, 6, and 8 ohm versions. Theses are the 6 ohm. I got them (on sale) at Madisound for $28! Published Specifications: Nominal Impedance: 6 Ohms Voice Coil Resistance: 4.21 Ohms Nominal Power: 90W Short Term Max Power: - Long Term Max Power: - Operating Power: - Sensitivity: 88.4 db - 1W/1M Frequency Range: 35-3000 Hz Free Air Resonance: 35 Hz Voice Coil Diameter: 40 mm Voice Coil Height: 14 mm Air Gap Height: 6 mm Effective Diaphragm Area: 132 cm^2 Moving Mass: 17.5 g Magnet Weight: - Force Factor: 7.5 Bxl Vas: 29.1 Liters Qms: 6.24 Qes: .35 Qts: .33 I don't know if this is good data, its just what the search turned up. Andrew

13th January 2011, 09:07 PM	#4
gfiandy Audio Engineer diyAudio Member Join Date: Jul 2003 Location: Cambridge UK	Follow this link to the next link and you really do need to do Ctrl-A to see the text. Vifa M18WO-09-06 / D25AG-35 help - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com

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