SI 24z build....8 of em' - Page 21 - AVS Forum
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Old 04-02-2014, 01:18 PM
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I'll measure it when I get home. That might help everyone get me headed in the right direction.

Right now I have a PSA XV15. Really like it but I have nowhere else to put subs. So might as well go huge in the one space I don't use anyway

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Old 04-02-2014, 03:56 PM
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KW had an entire room subwoofer, not just a closet wink.gif

Someone from the ib cult had one in a closet that got posted a lot.
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Old 04-02-2014, 05:50 PM
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Ya he had the ported FI IB3's(128cuft ?) and then the door IB on his room which he also ported.
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Old 04-02-2014, 06:10 PM
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I would imagine a very large box would be a better known result. It can be tuned and you'll know what you are going to get before you build.

Really like the idea of a 24" monster ported sub. Just not really sure how to design it. Once I saw the OP design that beast as a joke, it got me thinking, lol

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Old 04-02-2014, 06:17 PM
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Closet is 48"x78"x25". Again it would need a front port. The ceiling actually is 92" tall inside the closet, the doorway is the first dimensions.

Is this crazy to want to build something like this?

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Old 04-02-2014, 06:20 PM
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Old 04-02-2014, 06:28 PM
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Nothing involving subwoofers is ever crazy here. Just make sure you try and put a subwoofer in there first and see if you like the placement.
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Old 04-02-2014, 07:00 PM
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I really considered the SI 24 but after talking with LTD02 for a while about how big of a ported cabinet I'd need I decided to go a different route. In a ported design it need a huge cabinet, I have graphs for one in a 36cu.ft cabinet with 1500 watts and a 12hz tune and one of a 48cu.ft cabinet with 2000watts of power. It was impressive but its just way too much cabinet for the amount of space that I had to work with.

I was also able to get two UXL-18's for less then the price of a single SI 24 so that was also the reason for not going with the SI 24's smile.gif
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Old 04-02-2014, 07:01 PM
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Quote:
Originally Posted by blah450 View Post

Just enlarge the Marty design or do one like Not's at the ideal volume.

You'd need to make the cabinet three to four times the size of the Marty, and even then I believe you would hardly reach xmax with 2000watts of power. smile.gif
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Old 04-02-2014, 07:04 PM
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Originally Posted by jbrown15 View Post

I was also able to get two UXL-18's for less then the price of a single SI 24 so that was also the reason for not going with the SI 24's smile.gif

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Old 04-02-2014, 07:25 PM
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Originally Posted by chrapladm View Post

Nothing involving subwoofers is ever crazy here. Just make sure you try and put a subwoofer in there first and see if you like the placement.

Problem is this is really the only other place I can put large subs. It would be near field, about 4' next to the couch (directly to the right while sitting). I have the XV15 near field as an end table on the other side of the couch. With a 120" screen I don't have a lot of room up front. I want to build 3 Elusive 1099's for the LCR and that wouldn't leave a ton of room to put subs up front. The one nice thing is it is a theater that I can do whatever I want to. It is already painted a very dark gray and the fiancee doesn't care what I do in there. Room treatments are something else I will be adding once I get more research done. I just got a calibrated mic and will try to run REW soon to see what my room is doing to the sound. I work at a nuclear power plant and we are in a refueling outage. This means I work all the time right now on 12 hour shifts! Looking forward to spending my hard earned money on fun projects in the next 6 months or so.

Maybe I should just start a thread of my own. Just really liked the monster a few pages back and just thought while ridiculous looking, it would be mighty impressive sounding.

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Old 04-02-2014, 07:28 PM
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Quote:
Originally Posted by jbrown15 View Post

I really considered the SI 24 but after talking with LTD02 for a while about how big of a ported cabinet I'd need I decided to go a different route. In a ported design it need a huge cabinet, I have graphs for one in a 36cu.ft cabinet with 1500 watts and a 12hz tune and one of a 48cu.ft cabinet with 2000watts of power. It was impressive but its just way too much cabinet for the amount of space that I had to work with.

I was also able to get two UXL-18's for less then the price of a single SI 24 so that was also the reason for not going with the SI 24's smile.gif

Do you have a build thread? If you went ported with 15hz or so as tune I would really like to see it. Doesn't seem to be a lot of large SW ported designs as most go sealed. The Marty looks awesome but the dimensions don't work for me.

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Old 04-02-2014, 07:59 PM
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mbyrnes...did you see "sub cannon" thread?...awesome sub tower...huge!...just can't remember if it was sealed.
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Old 04-02-2014, 08:01 PM
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Chop did you settle on building a ported cabinet and just sealing up the ports when you want sealed single digits or do you have a clue yet?

Sorry about the derail above.
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Old 04-02-2014, 08:34 PM
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Quote:
Originally Posted by mbyrnes View Post

Do you have a build thread? If you went ported with 15hz or so as tune I would really like to see it. Doesn't seem to be a lot of large SW ported designs as most go sealed. The Marty looks awesome but the dimensions don't work for me.

I worked out a quick design for the SI24 I was going to build for the g2g this weekend but needed much more wood than I had on hand and building out last second would have been tough. Essentially it was a 4x8 sheet of ply for the front baffle, with a massive 4-5 inch tall port that ran side to side of the 4 foot side of the box. was looking at around a 14hz tune. I still might do it for fun and make a third row bar out of it. problem is the sub would be firing at the second row seating and no one wants to put a baby like that in a corner biggrin.gifbiggrin.gif I would want to see that think rockin and rollin all the time!!!!

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Old 04-02-2014, 08:34 PM
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Quote:
Originally Posted by mbyrnes View Post

Do you have a build thread? If you went ported with 15hz or so as tune I would really like to see it. Doesn't seem to be a lot of large SW ported designs as most go sealed. The Marty looks awesome but the dimensions don't work for me.

http://www.avsforum.com/t/1506201/ltd-m18-sub-build

My tune is 15-16hz. I was going to go sealed but it was had to ignore the extra output with the ported.
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Old 04-03-2014, 01:23 AM - Thread Starter
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Originally Posted by chrapladm View Post

Chop did you settle on building a ported cabinet and just sealing up the ports when you want sealed single digits or do you have a clue yet?

Sorry about the derail above.

Nah,sticking with the original 15 cube sealed for each of them for now. I will build one ported cab just to see and if for some weird reason the sealed aren't enough I'll do it
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Old 04-03-2014, 04:15 AM
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I figure with that ,much displacement anyone would be happy with sealed. BUT everyone here is a rare breed.tongue.gif
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Old 04-03-2014, 05:05 AM
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Quote:
Originally Posted by jbrown15 View Post

http://www.avsforum.com/t/1506201/ltd-m18-sub-build

My tune is 15-16hz. I was going to go sealed but it was had to ignore the extra output with the ported.

How are you liking your cabinet? I'm thinking I'm going to clone yours for my ultimax 18s.

I didn't see it mentioned anywhere so sorry if it's been said, but the 24" is a cool thousand now. Eeeek

Dan
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Old 04-03-2014, 05:31 AM
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Originally Posted by saabracer23 View Post

How are you liking your cabinet? I'm thinking I'm going to clone yours for my ultimax 18s.

I didn't see it mentioned anywhere so sorry if it's been said, but the 24" is a cool thousand now. Eeeek

Dan

And we will see how it stacks up against other comparable $1,000 drivers this weekend.
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Old 04-03-2014, 05:53 AM
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Yes, just sad to see

Dan
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Old 04-03-2014, 06:34 AM - Thread Starter
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And we will see how it stacks up against other comparable $1,000 drivers this weekend.

Yep...I have a strong feeling that it's going to easily establish itself as new $1k king...
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Old 04-03-2014, 09:07 AM
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"Closet is 48"x78"x25". Again it would need a front port. The ceiling actually is 92" tall inside the closet, the doorway is the first dimensions.
Is this crazy to want to build something like this?"

not crazy. somebody, forgive me as i forget who at the moment, reminded me that below the lowest non-zero mode for the room, placement doesn't matter. if you have a medium size room or smaller, that will be somewhere around 30hz or so, so you could use the closet space for a giant ported cab that will crush the 15-30hz region (without worry about placement) and perhaps run it higher (if placement turns out to be ok in combination with the other subs). we designed something along those lines for beast. his was a little more complicated 6th order design. the closest might need some additional bracing, but if that large space is just sitting there is it a good way to "hide" a giant sub.

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Old 04-03-2014, 09:12 AM
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Yep...I have a strong feeling that it's going to easily establish itself as new $1k king...

Without a doubt. It has double the displacement.

On the other hand, the enclosures required are over twice as large if you start getting into the output per cubic foot game. Everything has tradeoffs.
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Old 04-03-2014, 09:13 AM
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Thanks for all the help guys. When I get closer to building I will start a thread. I got enough to know that this is the direction I want to take. I'll play around with design programs in the mean time. Also want to learn how to use REW in the meantime.

I will watch this thread closely and beast's gtg to see how people respond to the 24"monster. Could always do two 18" instead but the cabinet will remain gigantic.

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Old 04-03-2014, 09:14 AM
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"Yep...I have a strong feeling that it's going to easily establish itself as new $1k king..."

if you get a chance, it would make for an interesting comparo against beast's 2242's for the 50hz and up region. and if something like this happens, be sure to EQ them for identical response and also use same room placement. those two drivers are about as opposite as there are, so this would help answer the long standing question of whether "bass is bass" or if there is more to it.

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Old 04-03-2014, 09:20 AM
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Originally Posted by mbyrnes View Post

Thanks for all the help guys. When I get closer to building I will start a thread. I got enough to know that this is the direction I want to take. I'll play around with design programs in the mean time. Also want to learn how to use REW in the meantime.

I will watch this thread closely and beast's gtg to see how people respond to the 24"monster. Could always do two 18" instead but the cabinet will remain gigantic.

Depends on the 18s. You can stuff 3 lms or uxl 18s in under 10 cubic feet. 10 cubes there gives you a Q of 0.562, with the 24 it's at 0.967
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Old 04-03-2014, 09:44 AM
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After a little research a Q of .5 is probably what I want to shoot for. If the uxl 18s are ever available I would go that route. Plus installing 3 boxes is much easier than one gigantic box. Thanks for the info. Have a lot to learn!

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Old 04-03-2014, 10:06 AM
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UXL18s are a great driver...they will be available...just might take a little while.
Good things come to those who wait...biggrin.gif
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Old 04-03-2014, 10:13 AM
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LTD02,
Didn't state "placement doesn't matter", more like "below the room's first mode; 0, 0, 1, ... there's no benefit to multiple distributed subs toward FR smoothing."

So yeah, a single behemoth sub, dedicated to the aforementioned region, mated with multiple distributed, perhaps more easily placed, modestly capable high-passed subs, is certainly one solid approach to covering the entire subwoofer bandwidth.

Any large volume adjacent space can be utilized. Closets or other such dead space would be fine for a LLT, a quasi-IB. The most obvious examples in my opinion are below the floor or above the ceiling ... as the full volume of a crawl space or attic are ideal, if executed correctly.

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