Needed assistance to build speaker box.

bentley388 · 1st August 2007, 01:58 PM

Hi all,

I'm keen to build a pair of fullrange speaker box for my newly purchase speaker - 2 VINTAGE 12" MAGNAVOX FULLRANGE ALNICO SPEAKERS AMPEG from ebay.

I am excited about this speaker box but unfortunate do not know to go about doing it.

I am using my dynaco ST70 / P3 for power.

Hope some epxert out there can help.

Thank you.

EDDIEMUNSTER · 3rd August 2007, 11:47 PM

Hello there. It seems that none of the guys here have experience with that driver. I had the same problem and did not get a response. If you can, take the drivers to a shop that can measure the driver parameters and then perhaps someone here can help you (not me unfortunately).

Cheers,

Doug

mashaffer · 4th August 2007, 12:37 AM

If you can't measure the parameters you might proceed under the assumption that they were meant for open back "enclosures" and build a baffle about two feet wide and two and a half feet tall with wings and a top plate about half of a foot deep and see how they sound. You might get a pleasant surprise.

If bass is very weak then the speakers Q may be lower suggesting a closed box (without params ported is almost impossible). If bass is boomy then try raising the woofer higher off of the floor, removing the wings, or making the baffle more narrow.

The beauty of OB is that experimentation is easy (and cheap if you start with a large baffle and cut it down as needed).

mike

Geek · 4th August 2007, 01:46 AM

Hi,

Here's a couple of methods I've used to get speaker params and they've been accurate when tested against a known set.

http://www.mhsoft.nl/Measuring_Loudspeakers.asp
http://sound.westhost.com/tsp.htm

Then pump the resulting data into WinISD Beta (easier for newcomers) for optimum box dimensions.

Cheers!

bentley388 · 4th August 2007, 02:57 AM

Hi guy many thanks for your information. I will tried to get more data and post it here for you guy to help me.

Thank you .

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3rd August 2007, 11:47 PM	#2
EDDIEMUNSTER diyAudio Member Join Date: Aug 2006	Hello there. It seems that none of the guys here have experience with that driver. I had the same problem and did not get a response. If you can, take the drivers to a shop that can measure the driver parameters and then perhaps someone here can help you (not me unfortunately). Cheers, Doug

4th August 2007, 12:37 AM	#3
mashaffer diyAudio Member Join Date: Jun 2004 Location: Indiana	If you can't measure the parameters you might proceed under the assumption that they were meant for open back "enclosures" and build a baffle about two feet wide and two and a half feet tall with wings and a top plate about half of a foot deep and see how they sound. You might get a pleasant surprise. If bass is very weak then the speakers Q may be lower suggesting a closed box (without params ported is almost impossible). If bass is boomy then try raising the woofer higher off of the floor, removing the wings, or making the baffle more narrow. The beauty of OB is that experimentation is easy (and cheap if you start with a large baffle and cut it down as needed). mike

4th August 2007, 01:46 AM	#4
Geek diyAudio Member Join Date: Sep 2004	Hi, Here's a couple of methods I've used to get speaker params and they've been accurate when tested against a known set. http://www.mhsoft.nl/Measuring_Loudspeakers.asp http://sound.westhost.com/tsp.htm Then pump the resulting data into WinISD Beta (easier for newcomers) for optimum box dimensions. Cheers!

4th August 2007, 02:57 AM	#5
bentley388 diyAudio Member Join Date: Aug 2007	Hi guy many thanks for your information. I will tried to get more data and post it here for you guy to help me. Thank you .

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