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Discussion Starter · #1 ·
I've got 16 JBL subwoofers that I was able to get bought while on the Black Friday sale that are currently sitting in the garage collecting dust. I bought these as a "just in case" I need them for the future theater room in the new house (3-5 years down the road honestly). I have a projector in the garage with 4 in-ceiling speakers. My thought is that I could build a box for these subs to use with the garage system until we get a dedicated room at the new house. I also wouldn't mind building some Titans when they come back in stock to put out in the garage and use the in-ceiling as atmos. I've got a shuffleboard table under the screen, so I'm not sure how everything would fit on the front wall, but I can work through that. I could always pull the shuffleboard table away from the front wall and stack titans and JBLs behind it.

The garage is 36'x35' with 14' tall ceilings. I'm not sure if it's even worth the effort honestly, but I'd think with 16 subs that I could get some decent bass out there. I'm thinking a tall stack of 8 subs on each side of the front wall, assuming I'd still have room to play shuffleboard. I'd guess ported would be my best bet since it's a decent sized space. Possibly 4 quad devastators, or just simple ported enclosures? I've got 2 NSWs in the house, and I doubt that 16 JBLs would come close to the output of those. Anybody with experience with these JBLs want to chime in on what they are capable of? This would be a good reason to go ahead and get the Titan 818s as well, haha.
 

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Discussion Starter · #4 ·
Where are you putting the center channel?
If I use a center, I'd probably have to pull the table away from the wall and get the tweeter and mid above the table height. Would probably be my best bet if I want to get everything as good as possible on the front wall. There's a space next to the stairs that looks perfect for a tall stack of subs. I could also move the table to the wall with the cornhole boards, but I like to stack my smoker and charcoal grill there.
 

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Discussion Starter · #6 ·
This sounds more like a game room with occasional movie watching or entertainment while playing. I would not care about that much bass in this situations. BTW, I bet 16 JBLs have more output than your two 21s.
Absolutely! Nothing serious by any means, but it'd be nice to take advantage of some of the gear I already have until it's time to move it to the new room. Bass would be nice for listening to music out in the garage, sports, tv, movies, etc.
 

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Under chair woofers with the chair floating on inner tubes. 2 per chair is a minimum in my opinion, and 4+ would be much better. My pair per chair get stinky during extended bass scenes.

Edit to add:
You don't show your seating, if you only have a couple of seats, then you could build a few Quad 12 regular of DF subs, and stack them up.
I set my stack of DF on their "sides" so the ports all line up.

Me for scale.
 

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Hi,

I would do 4 drivers in an 8 cubic foot sealed enclosure. Wire in series & parallel for 4ohm load.

Build 4 total of these with the 16 drivers. One for each corner of the room. Or two in the front two corners, or however you want to do it that is best for your room and seating options.

Feed 1kw to each enclosure.

As for the enclosure and driver arrangement, you could do an array where they all line up and face you. Or you could do opposing push-push (two drivers on each side, facing away from each other) to stabilize the box from vibration.

16x JBLs with 4kw across them all will have lots of output. Mass cone area rules. This is the equivalent of 4x 24" drivers in area. But the cost is peanuts. Here's the model of the SPL of 16x of them sealed working together in 4 boxes with 4 drivers each with 1kw into each box:

Rectangle Slope Font Plot Parallel


Very best,
 

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I'd just get some off the shelf dual 12" sealed boxes from Amazon or wherever, maybe start with two then keep adding more as you desire. Then dump them on craigslist for like $50 each when you are done with them.

 

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Hi,

I would do 4 drivers in an 8 cubic foot sealed enclosure. Wire in series & parallel for 4ohm load.

Build 4 total of these with the 16 drivers. One for each corner of the room. Or two in the front two corners, or however you want to do it that is best for your room and seating options.

Feed 1kw to each enclosure.

As for the enclosure and driver arrangement, you could do an array where they all line up and face you. Or you could do opposing push-push (two drivers on each side, facing away from each other) to stabilize the box from vibration.

16x JBLs with 4kw across them all will have lots of output. Mass cone area rules. This is the equivalent of 4x 24" drivers in area. But the cost is peanuts. Here's the model of the SPL of 16x of them sealed working together in 4 boxes with 4 drivers each with 1kw into each box:

View attachment 3411439

Very best,
Your math is slightly off. It's the equivalent of about 2 24s. But still way cheaper.
 

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Maybe I'm missing something?

4x12" = 452.4 square inches
1x24"= 452.4 square inches

Very best,
You're right. I forgot to change the quantity of 24s in my excel calculator, haha.

Though it is worth noting that basically every 24 has at least double the xmax of the JBLs. But yes from a cone area standpoint, 4 12s to 1 24. My bad.
 

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You're right. I forgot to change the quantity of 24s in my excel calculator, haha.

Though it is worth noting that basically every 24 has at least double the xmax of the JBLs. But yes from a cone area standpoint, 4 12s to 1 24. My bad.
Yea the 24's have more xmax for sure, but in just area alone, they're equivalent. Was just using the example since he has 16x JBL drivers and was wondering what to do with them. The output of the 16x JBLs will produce pretty significant SPL with basic monkey coffins with a little power. And they're dirt cheap. You could build the 16x JBLs with 4x 1kw amps at about $500 for the drivers and $1k for the amps (probably less but just being generous and rounding). Another $500 just in ply/studs and some woodglue, wire, terminals. So a pretty easy build for $2k USD that achieves pretty solid SPL down to whatever the room allows, but spread out into 4 enclosures that could do the corners or colocate in two specific areas giving some pretty nice options for multiple seating optimization for response. Way cheaper than 4x 24's ($6k or so at least, plus amps at least another $2k, plus enclosure materials, so over $8k to $9k on the cheaper side to do that to gain the additional xmax).

It's pretty impressive what can be done with a bunch of cheap drivers!

Very best,
 

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Discussion Starter · #16 ·
It sounds like with 16 JBLs, there is no need to go ported? It'd be pretty nice and simple to build some tall tower like sealed enclosures. I think it makes sense to move the shuffleboard table to a different wall to get rid of that problem. How much SPL will I leave on the table if I don't do the quad devastators and just do sealed?
 

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It sounds like with 16 JBLs, there is no need to go ported? It'd be pretty nice and simple to build some tall tower like sealed enclosures. I think it makes sense to move the shuffleboard table to a different wall to get rid of that problem. How much SPL will I leave on the table if I don't do the quad devastators and just do sealed?
It depends on frequency, but a Devastator gives a pretty big advantage above 30hz, however they are much larger. That cabinet, that is larger than me, holds 12 and weighs about 700 pounds. It's actually just three screwed together, so I can unscrew them and move them out of the basement.

If you want to chase well under 20hz, then this isn't for you.

The Dev posts have their performance, if someone doesn't beat me to building a graph for four of them tomorrow to compare against, I will graph it up in the afternoon.
 
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