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Old 1st August 2011, 03:20 PM   #1
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Default Volume sharing for a 10 " and 12 " woofs

Guys

Can I share the Volume for two Woofers ( 150 Hz down ) .

They are both 4 inch Voice coils but one is a 10" other is 12" same magnets.

I would prefer to do one volume tuned to 25 hz . both drivers are ok with that.

thank you for help .

Good day
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Old 1st August 2011, 03:52 PM   #2
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Originally Posted by domtweaker View Post
Guys

Can I share the Volume for two Woofers ( 150 Hz down ) .

They are both 4 inch Voice coils but one is a 10" other is 12" same magnets.

I would prefer to do one volume tuned to 25 hz . both drivers are ok with that.

thank you for help .

Good day
You can share volume, but a larger speaker generally would be better off with more volume than the smaller speaker.

The differing size speakers will introduce a sort of “drone cone”, or passive radiator aspect into the design, tuning won’t be straight forward.

Since both speakers have the same magnet structure, displacement is probably more on the larger speaker, it should use a larger port volume than the smaller speaker.

Using the same gross volume, you can split up the the two speakers with a center divider, and tune both portions to 25 Hz with a port for each chamber.

Using separate chambers will reduce distortion, even in cabinets using the same type of speaker, more so with different size speakers.
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Old 1st August 2011, 04:19 PM   #3
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Thank you

makes it more logical that way
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Old 1st August 2011, 04:53 PM   #4
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Originally Posted by domtweaker View Post
Thank you

makes it more logical that way
You are welcome.

By the way, I did put 12" and 15" speakers in the same chamber back around 1972, let's just say that I learned from my mistakes.
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Old 1st August 2011, 06:03 PM   #5
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ha ha that would be an expensive lesson indeed.

I thought these were so close but makes sense with tuning and speed too.

greetings from HOT Canada
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Old 1st August 2011, 08:42 PM   #6
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Quote:
Originally Posted by domtweaker View Post
ha ha that would be an expensive lesson indeed.

I thought these were so close but makes sense with tuning and speed too.

greetings from HOT Canada
dom used the "sp**d" word
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Old 2nd August 2011, 11:28 PM   #7
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Wilson Audio:

Click the image to open in full size.

Has one big port out the back.
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Old 3rd August 2011, 12:34 AM   #8
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A link with a study full range + woofer :

http://www.fortunecity.com/rivendell...d/dddllqd.html
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Old 3rd August 2011, 12:59 AM   #9
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I m sure Wilson divided the cabinet inside even though there is only one port in the rear .
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Old 3rd August 2011, 01:07 AM   #10
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Having seen them, stuck my arm in the port, and touched both woofers (Focal), I'd say you were incorrect. Maybe they have changed it for the newer version, I saw the original.

The Speakerlab Model 7 was also this way.

Click the image to open in full size.

http://myweb.cableone.net/cpwoods/Audiokarma/Model7.jpg
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Last edited by djk; 3rd August 2011 at 01:11 AM.
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