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Old 29th May 2003, 12:25 PM   #1
sunil is offline sunil  India
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Default f3 of 66hz

Hi,

If I get an f3 of 66hz from a closed-box how much difference will
the loading by the room make ? How does this happen ?

Will, mounting the driver closer to the lower end of the cabinet make a big difference ?

Will using 2 drivers in parallel improve the output ?

sunil
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Old 29th May 2003, 09:10 PM   #2
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""If I get an f3 of 66hz from a closed-box how much difference will
the loading by the room make ? How does this happen ?""

Do a search on room gain - I believe Kelticwizard posted some graphs.

I'd reckon on needing a sub for full range....

""Will, mounting the driver closer to the lower end of the cabinet make a big difference ?""


I doubt a "big" difference

""Will using 2 drivers in parallel improve the output ?""

Sensitivity wise,yes - won't lower the f3 though. need to eq or port or TL ...

Rob
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Old 30th May 2003, 04:33 AM   #3
sunil is offline sunil  India
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Rob,

Thanx for the info.
I'll lookup on the wizards reply.

BTW, I've more or less decided on
a proper side-firing woofer.

Cheers,
sunil
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Old 30th May 2003, 04:56 AM   #4
Wizard of Kelts
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Here is a link to a discussion where I give liks to the charts. there is also a Baffle Diffraction Chart.

There are other threads where I posted that room gain chart, too.

Hope it helps.
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Old 30th May 2003, 02:05 PM   #5
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Default Re: f3 of 66hz

Quote:
Originally posted by sunil
Hi,

If I get an f3 of 66hz from a closed-box how much difference will
the loading by the room make ? How does this happen ?

Will, mounting the driver closer to the lower end of the cabinet make a big difference ?

Will using 2 drivers in parallel improve the output ?

sunil
I don't see Keltic's link.

Think of the speaker operating in four conditions: free space, on an infinite wall, on a wall and floor (or ceiling) and on two perpendicular walls and floor (corner) -- for each of these settings the speaker is "coupling" into a different mechanical impedance.
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Old 30th May 2003, 04:24 PM   #6
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links:

Room Gain

Volume Displacement For SPL Chart

Rob
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Old 30th May 2003, 05:39 PM   #7
Wizard of Kelts
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Oops. Forgot the link.

Thanks Rob.
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