How to design a shallow sub enclosure? (newbie question)

8252 Views 11 Replies 4 Participants Last post by curtisG, Feb 21, 2013

curtisG

Discussion Starter · Jan 26, 2013 (Edited)

My home theater layout, which uses an acoustically transparent screen, has a shallow cavity behind the screen. I'm trying to figure out how to design a sealed sub enclosure which would fit in there.

Here's the layout of the room (Note: the sub shown in the bottom right corner of the floor plan is no longer there as it has died):

The area between the AT screen and back wall is only 15", so this doesn't give me many options. I'm hoping to have two 15" subs (or maybe even 18" subs but doubt that's possible due to the size of the ) behind the screen, on each side of the center speaker.

I'm planning on using a separate amplifier to keep the size of the enclosure as small as possible. Amp(s) might be installed either behind the screen or back at the equipment rack.

So my question is how does one go about designing an enclosure where you have a depth constraint on the enclosure? The calculators I've seen posted in the forum don't make it clear how to force a specific depth.

Thanks

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curtisG

Discussion Starter · #2 · Jan 26, 2013

Okay - didn't know about the restrictions on being able to post an image.

Let's try this again. Here's the floor plan of my home theater:

--curtis

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curtisG

Discussion Starter · #3 · Jan 26, 2013 (Edited)

curtisG said:
Okay - didn't know about the restrictions on being able to post an image.

Let's try this again. Here's the floor plan of my home theater:

--curtis

Not sure why the images will not post (shows up in preview, but not in post)

Home Theater Floor Plan

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curtisG

Discussion Starter · #4 · Jan 26, 2013 (Edited)

BTW: B&W makes a shallow, 15" sealed sub that's only 10.3" deep, so this should be possible:

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robbo266317

· #5 · Jan 26, 2013

curtisG said:
So my question is how does one go about designing an enclosure where you have a depth constraint on the enclosure? The calculators I've seen posted in the forum don't make it clear how to force a specific depth.

Thanks

It is completely up to you what dimensions you use for an enclosure.
Simply find out the volume required and then work out a suitable height and depth to suit your available depth.

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chrapladm

· #6 · Jan 26, 2013

If 15" depth is all you have what width dimensions are available and height?

Most 18's are 11" and under for depth. So adding double thick 3/4" walls, 1" for venting clearance, 1.5" for flush mounting and 9.5" depth you are looking at 15" on the SI 18". Now the woofer would be flush but if your screen wall material is touching the woofer it may slightly touch it.

Now if you went with the 15" you have another 1.5"'s of clearance so that might be the better option. PLUS they like smaller boxes. SO I would say get as many of the 15's for $170 as you can afford.

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curtisG

Discussion Starter · #7 · Jan 26, 2013

chrapladm said:
If 15" depth is all you have what width dimensions are available and height?

The depth is the only constraint. The other factors (height, width, or weight) are not problematic.

chrapladm said:
Most 18's are 11" and under for depth. So adding double thick 3/4" walls, 1" for venting clearance, 1.5" for flush mounting and 9.5" depth you are looking at 15" on the SI 18". Now the woofer would be flush but if your screen wall material is touching the woofer it may slightly touch it.

Now if you went with the 15" you have another 1.5"'s of clearance so that might be the better option. PLUS they like smaller boxes. SO I would say get as many of the 15's for $170 as you can afford.

Thanks for the info. Which $170 15's are you referring to?

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chrapladm

· #8 · Jan 26, 2013

Stereo Integrity or SI 15"
http://stereointegrity.com/index.php?id=60

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curtisG

Discussion Starter · #9 · Feb 7, 2013

chrapladm said:
Stereo Integrity or SI 15"
http://stereointegrity.com/index.php?id=60

Thanks for the recommendation. My two SI 15" D2's were delivered yesterday!

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chrapladm

· #10 · Feb 8, 2013

:T:clap: Cant wait to see more.

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Electrodynamic

· #11 · Feb 21, 2013

For some odd reason I was thinking less than 4" of depth when I read "shallow sub enclosure", haha.

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curtisG

Discussion Starter · #12 · Feb 21, 2013

Electrodynamic said:
For some odd reason I was thinking less than 4" of depth when I read "shallow sub enclosure", haha.

Wow - that is _really_ shallow

Here is what I ended with, a little over 12 1/2" deep:

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