f3 of 66hz

[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

 

[SpeakerBob]

""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

 

[sunil]

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

 

[kelticwizard]

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.

 

[jackinnj]

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.

 

[SpeakerBob]

links:

http://www.diyaudio.com/forums/showthread.php?threadid=1261&highlight=room+AND+gain

http://www.diyaudio.com/forums/showthread.php?s=&threadid=5668&highlight=SPL+Volume+Chart

Rob

 

[kelticwizard]

Oops. Forgot the link.

Thanks Rob.