What would you build? Sub wise? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 19 Old 06-16-2019, 03:00 PM - Thread Starter
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What would you build? Sub wise?

Hi all my room is 9 foot x 18 foot and is a dedicated av room, with a fixed projector screen.



I have built a baffle wall with DIYSG HTM 12 speakers built into the wall.


I have space under the main speakers for 2 x subwoofers and have bought 2 x Dayton Ultimax 18 inch drive units.


I now need to decide what enclose to put the Subwoofer drive units in? Sealed? Ported etc ?


The space I have for each subwoofer is 21.5 inch depth x 39.5 inch length x 27.5 inch height.


So what do i build? thanks
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post #2 of 19 Old 06-16-2019, 03:01 PM
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Quote:
Originally Posted by grahamricho View Post
Hi all my room is 9 foot x 18 foot and is a dedicated av room, with a fixed projector screen.



I have built a baffle wall with DIYSG HTM 12 speakers built into the wall.


I have space under the main speakers for 2 x subwoofers and have bought 2 x Dayton Ultimax 18 inch drive units.


I now need to decide what enclose to put the Subwoofer drive units in? Sealed? Ported etc ?


The space I have for each subwoofer is 21.5 inch depth x 39.5 inch length x 27.5 inch height.


So what do i build? thanks


Use every inch of space, and build a ported cab tuned to 17 ish. Two of those will be sweet.
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post #3 of 19 Old 06-16-2019, 03:03 PM
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Check out the Marty thread.

Two full Marty’s are the way to go.

Leave it at 8 ohms and call it a day :)
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post #4 of 19 Old 06-16-2019, 03:09 PM
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Or there’s always tapped horn. I’m about to build 2 Pico wreckers.
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post #5 of 19 Old 06-16-2019, 03:10 PM - Thread Starter
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Hi thanks but i dont have room for 2 full martys ?
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post #6 of 19 Old 06-16-2019, 03:12 PM - Thread Starter
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I can build 2 encloses to the sizes ive given but how do i work out the port length and size of the port? thanks
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post #7 of 19 Old 06-16-2019, 03:13 PM
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Originally Posted by grahamricho View Post
Hi thanks but i dont have room for 2 full martys ?

Oh sorry missed that part. There’s also the Marty Cube and others. Stonehenge maybe?

Leave it at 8 ohms and call it a day :)
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post #8 of 19 Old 06-16-2019, 03:14 PM - Thread Starter
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Thanks, the stonehenge ?
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post #9 of 19 Old 06-16-2019, 03:27 PM
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Quote:
Originally Posted by grahamricho View Post
Hi all my room is 9 foot x 18 foot and is a dedicated av room, with a fixed projector screen.



I have built a baffle wall with DIYSG HTM 12 speakers built into the wall.


I have space under the main speakers for 2 x subwoofers and have bought 2 x Dayton Ultimax 18 inch drive units.


I now need to decide what enclose to put the Subwoofer drive units in? Sealed? Ported etc ?


The space I have for each subwoofer is 21.5 inch depth x 39.5 inch length x 27.5 inch height.


So what do i build? thanks
It looks like a modified version of the Mini Marty (24" x 25.5" x 40") might work in your space, or perhaps a modified Johnny Sub design, which just a bit smaller than the Mini Marty @ 24" x 25.5" x 32". both can be laid on their sides to fit within your height requirements.

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post #10 of 19 Old 06-16-2019, 03:45 PM - Thread Starter
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So if i build a cabinet the sizes i said, how do i work out the port size and tuning?



Because both the mini marty and johnny sub are both deeper than my sizes ? thanks
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post #11 of 19 Old 06-16-2019, 04:00 PM
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You really need to model it. WinISD is one free software example.
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post #12 of 19 Old 06-16-2019, 04:14 PM - Thread Starter
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Thanks, ive had a quick look, how comes no dayton drivers are in the database?
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post #13 of 19 Old 06-16-2019, 04:23 PM
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Did a quick model using your dimensions (~10cf net). 2 square ports, 5"x5"x44" long should bring tune in between 15-16Hz and should be flat in most rooms down to 15Hz at least.
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Take the Red Pill (BassEQ) BassEQ Demo Clips
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post #14 of 19 Old 06-16-2019, 04:28 PM - Thread Starter
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Thank you, so the ports size can be any size the equals your 2 x 5" x 5" ? so 1 x 20" x 2.5" ? thanks
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post #15 of 19 Old 06-16-2019, 04:29 PM
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What would you build? Sub wise?

Quote:
Originally Posted by grahamricho View Post
Thank you, so the ports can be any size the equals your 5" x 5" ? so 20" x 2.5" ? thanks


I’d go 3” tall.
My hst cabs are very similar size overall. 10cf. 3”x 17 X 44” ports.
The hst’s move a hell of a lot of air though.
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post #16 of 19 Old 06-16-2019, 04:36 PM - Thread Starter
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Thanks, so how do you work out bracing in the actual volume of it? The more bracing you use the smaller the internal volume you have? thanks
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post #17 of 19 Old 06-16-2019, 05:25 PM
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Originally Posted by grahamricho View Post
Thank you, so the ports size can be any size the equals your 2 x 5" x 5" ? so 1 x 20" x 2.5" ? thanks
I prefer square over slot personally, but a slot port is fine, just match the cross-sectional area and length.

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Originally Posted by grahamricho View Post
Thanks, so how do you work out bracing in the actual volume of it? The more bracing you use the smaller the internal volume you have? thanks
The bracing won't take up enough space to make a significant difference. You should end up around the 10cf net internal that I estimated.

Take the Red Pill (BassEQ) BassEQ Demo Clips
Video: Sony 85" X900F @ 80" eyes-to-screen (49.4° viewing angle)
Audio: Denon AVR-X4400H 7.2.4 Atmos
Mains: Fusion-15 LR, Custom Tapered Ported Volt-6 Center, Ported Volt-10 Surrounds, Custom 45°/45° Double-Angled Ported Volt-6 Atmos
Subs: The Two Towers (HT18 32cf 11.5Hz x 2), UM18 4cf x 2, Crowson MAs x 4
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post #18 of 19 Old 06-18-2019, 07:33 PM
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Depending on the mounting depth you may have had the space for dual ported's in your baffle wall.
But if it's already finished or the depth isn't there then I guess it's a no-go.

In that case, just go with the biggest ported boxes you can make... that would likely be the largest boom-per-dollar for the effort.

I'd only recommend sealed if space is of great concern, or if your goal was maximum single-digits with an array of 18's... (not just 2).
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post #19 of 19 Old 06-19-2019, 07:19 AM
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Just so you dont have to hunt too far, here are the winISD files for the Ultimax.

I would go the largest you can @ roughly 17 Hz. Keep in mind the port air velocity. As a good start, you can check out the Marty variations and push pull the sides to accomplish the same volumes that would fit
Attached Files
File Type: zip Dayton Ultimax.zip (3.3 KB, 6 views)
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