A Way to put Subwoofer in Joist????

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T

tgadget

Audiophyte
Hello,
Renovating my house and have little floor space! is there any way to put subwoofers in the ceiling joists or floor joists which are 16" O.C. and 14 1/4" X 7 1/2" deep, and use cavity in a way to get my lows? do I have to put a duct to listening area? any suggestions appreciated.
thanks
t
 
Mr. Lamb Fries

Mr. Lamb Fries

Full Audioholic
tgadget said:
Hello,
Renovating my house and have little floor space! is there any way to put subwoofers in the ceiling joists or floor joists which are 16" O.C. and 14 1/4" X 7 1/2" deep, and use cavity in a way to get my lows? do I have to put a duct to listening area? any suggestions appreciated.
thanks
t
Click to expand...

There was a post about someone who did this. the enclosure was located in the crawl space. It looked awesome. It looked like a big "in ceiling " speaker mounted flush with the ceiling. Not sure if it would sacrafice in performance (probably not as long as it is calibrated correctly), but the astetics and use of space is great! Hopefully he will chime in but check the DIY section to see if you can find the post.
 
D

doomguardian

Audioholic
That looks pretty neat, but will it thump the floor like it would if it was on the ground?:cool:
 
Sheep

Sheep

Audioholic Warlord
doomguardian said:
That looks pretty neat, but will it thump the floor like it would if it was on the ground?:cool:
Click to expand...
According to king daddy, it will hit into the teens, even the single digit Hz area.

Roof, floor, no diff. 4 18inch drivers, now thats a difference. Not to mention having an attic for a box.

SheepStar
 
bigpapa

bigpapa

Junior Audioholic
The 'Thump' is everywhere...

doomguardian said:
That looks pretty neat, but will it thump the floor like it would if it was on the ground?:cool:
Click to expand...
That's a BIG driver. Wow.

One trick we use is to create many sources of bass, instead of the one monster. Use two dual 8" in wall subs in balance accross your ceiling, amped together. That's 32" of driver cone dedicated to LFE! But, it won't drown out other stuff and make you puke.

Build sealed enclosures for them in the attic and insulate. Most of the energy now passes into the listening space, and you're sealed from attic air.:cool:
 
Last edited:
bigpapa

bigpapa

Junior Audioholic
OMG, that's insane

I just looked at all the pictures.

That's bordering on a subwoofer fetish.:eek: Methinks one 18" driver for a room that size would sound awesome.

That room didn't look very big. Those things will make you puke if driven too high. Oh well, to each their own.
 
jaxvon

jaxvon

Audioholic Ninja
bigpapa said:
That's a BIG driver. Wow.

One trick we use is to create many sources of bass, instead of the one monster. Use two dual 8" in wall subs in balance accross your ceiling, amped together. That's 32" of driver cone dedicated to LFE! But, it won't drown out other stuff and make you puke.

Build sealed enclosures for them in the attic and insulate. Most of the energy now passes into the listening space, and you're sealed from attic air.:cool:
Click to expand...
On the issue of math, 4 8" cones will have 64*pi square inches of radiating area, while a 32" cone will have 256 square inches of radiating area, 4 times the area of the quad 8s.
 
bigpapa

bigpapa

Junior Audioholic
jaxvon said:
On the issue of math, 4 8" cones will have 64*pi square inches of radiating area, while a 32" cone will have 256 square inches of radiating area, 4 times the area of the quad 8s.
Click to expand...
I forgot about pi. Thanks:eek:

But, 4 x 8" drivers is 100.48 square inches, isn't it?

8 x 3.14, then x 4 = 100.48

32 x 3.14 = 100.48

That will still equal one 32" cone in area. I'm not an engineer, am I missing something?:confused:
 
R

rumble

Audioholic
tgadget said:
Hello,
Renovating my house and have little floor space! is there any way to put subwoofers in the ceiling joists or floor joists which are 16" O.C. and 14 1/4" X 7 1/2" deep, and use cavity in a way to get my lows? do I have to put a duct to listening area? any suggestions appreciated.
thanks
t
Click to expand...
Yes you can build what is called an infinite baffle subwoofer. You must purchase drivers specifically designed for ib use.

For more info google "cult of the infinitely baffled" or try this link:

http://ibsubwoofers.proboards51.com/
 
R

rumble

Audioholic
doomguardian said:
That looks pretty neat, but will it thump the floor like it would if it was on the ground?:cool:
Click to expand...
An ib sub if played loud enough has the same capability to excite objects in the room as a box sub. I'd personally prefer to keep the vibrations in air....
 
R

rumble

Audioholic
bigpapa said:
I just looked at all the pictures.

That's bordering on a subwoofer fetish.:eek: Methinks one 18" driver for a room that size would sound awesome.

That room didn't look very big. Those things will make you puke if driven too high. Oh well, to each their own.
Click to expand...
The output of an ib sub will be less than that of a sealed box all other things being equal, that is one of the reasons mosts ibs use multiple drivers.

You won't puke even with the sub driven to high levels. Under 20hz your not really hearing sound with your eardrums and can experience quite high spl levels.
 
bigpapa

bigpapa

Junior Audioholic
rumble said:
The output of an ib sub will be less than that of a sealed box all other things being equal, that is one of the reasons mosts ibs use multiple drivers.
Click to expand...
OMG, I just went to your links and learned something. What's the solution for amplification? Anything special?
 
Sheep

Sheep

Audioholic Warlord
Its not even an issue of math guys, those are 18INCH DRIVERS, not 8.

SheepStar
 
jaxvon

jaxvon

Audioholic Ninja
bigpapa said:
I forgot about pi. Thanks:eek:

But, 4 x 8" drivers is 100.48 square inches, isn't it?

8 x 3.14, then x 4 = 100.48

32 x 3.14 = 100.48

That will still equal one 32" cone in area. I'm not an engineer, am I missing something?:confused:
Click to expand...
Yes. The forumula for area of a circle is pi*r^2, where r is the radius of the circle, equal to half the diameter. Therefore, the radius of an 8" circle is 4". Four squared is 16, 16*4=64. The radius of a 32" circle is 16", 16^2 is 256. Basically what this means is that area does not increase linearly with radius as you are implying.
 
bigpapa

bigpapa

Junior Audioholic
jaxvon said:
Yes. The forumula for area of a circle is pi*r^2, where r is the radius of the circle, equal to half the diameter.
Click to expand...
Uh-oh. I don't know what ^ is, but I always thought the equation was 3.14 (pi) times diameter. :eek:
 
R

rumble

Audioholic
bigpapa said:
OMG, I just went to your links and learned something. What's the solution for amplification? Anything special?
Click to expand...
Nothing special. Popular amps are nady, crown, behringer etc. The type and number of drivers used pretty much dictates how much power you need.
 
Sheep

Sheep

Audioholic Warlord
bigpapa said:
Uh-oh. I don't know what ^ is, but I always thought the equation was 3.14 (pi) times diameter. :eek:
Click to expand...
It means to the power of. *^2 = * squared

SheepStar
 
jaxvon

jaxvon

Audioholic Ninja
bigpapa said:
Uh-oh. I don't know what ^ is, but I always thought the equation was 3.14 (pi) times diameter. :eek:
Click to expand...
Pi*diamter is the circumference of a circle, the distance around the outside.
 
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