Two 18" sealed and one 18" dual opposed? - AVS Forum
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post #1 of 9 Old 05-05-2013, 04:16 PM - Thread Starter
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I am going to build two or three sealed subs with Dayton 18" HO's. I can put two up front and one in back. Would it be a bad idea to make the back sub a dual opposed?
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post #2 of 9 Old 05-05-2013, 07:06 PM
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Not at all if thats what you can fit. Level matching will take care of output differences.

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post #3 of 9 Old 05-05-2013, 10:51 PM
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It is not a "bad" idea. However, bass is highly dependant on room acoustics. It's nearly impossible to say unless you've had 4 sub points in your room in the past vs just 3.
Chances are there wouldn't be a huge difference in response (if any), but no one knows for sure 100%
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post #4 of 9 Old 05-06-2013, 11:36 AM - Thread Starter
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Hmmmm... So do I risk it? Maybe I should just go with three single sealed boxes.
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post #5 of 9 Old 05-06-2013, 11:50 AM
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If you can do dual opposed in the back why no just build 4 cabinets? You can then stack two in the back to start and if you're getting nasty nulls you can then have more flexibility to relocate and move them around. Do you have a layout of the room?
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post #6 of 9 Old 05-06-2013, 12:55 PM - Thread Starter
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I have attached a layout of the room. The subs pictures represent proposed / future sub locations. I currently only have one sub in the front right corner, which recently died.

I'm really after that deep chest pounding bass. I was initially going to only do two sealed 18" boxes. But after reading a bunch of the threads here (particularly Gorill83's thread), I'm wondering if two 18's will give me what I'm after.


living room layout.pdf 257k .pdf file

WP_001117.jpg 94k .jpg file

Edit: I added a current picture of the front stage.
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File Type: jpg WP_001117.jpg (94.2 KB, 12 views)
Attached Files
File Type: pdf living room layout.pdf (257.1 KB, 16 views)
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post #7 of 9 Old 05-06-2013, 01:04 PM
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Is the room on concrete or above grade?
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post #8 of 9 Old 05-06-2013, 01:06 PM - Thread Starter
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Above grade on concrete slab.
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post #9 of 9 Old 05-06-2013, 01:17 PM
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how about one or two right behind that loveseat? that will help with you being on a slab.

two singles maybe? im adding two single 18's that will only be 12.75" deep. low profile to hug the wall under my screen. you could do the same thing for behind the loveseat if space is limited. firing into the back of the loveseat.

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