12" JBL speaker $29 on black friday at Bestbuy - Page 103 - AVS Forum | Home Theater Discussions And Reviews
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post #3061 of 3193 Old 01-02-2020, 11:54 AM
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Thanks Michael and Nalleh!
I'm going to leave 2-3" material/I-beam right in the middle and around the perimeter of the center divider, this should hopefully be enough for these JBLs. See diagram. Hopefully I can remove the back together with the rear divider cut-out in case I have to plug the box up again.
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post #3062 of 3193 Old 01-02-2020, 12:09 PM
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Quote:
Originally Posted by Cotton1 View Post
I think I remember seeing a number of like 67db and I am not sure if this is before or after they added the row of small fans on the back. I am planning on getting a soundproof rack so hopefully this won't be that big of an issue. If I can't find a cheap used one online I might just get a server rack from work and line it with some foam.

That's exactly how this amp is going to sound like full throttle, like a server! I think those look like the 1 (RU) rack unit server fans.



i'm still not sure what to do on my NX6000, I don't plan on doing the Noctua fan swap right away as it might void the warranty. I'm going to try to find a way to mount 120mm case fans in front to hopefully pull a lot of air but the stock fans would still be spinning so not sure how much that's really going to help.
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post #3063 of 3193 Old 01-02-2020, 01:15 PM
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Quote:
Originally Posted by Arv View Post
I'm going to try to find a way to mount 120mm case fans in front to hopefully pull a lot of air but the stock fans would still be spinning so not sure how much that's really going to help.

Don't bother. It won't do anything to reduce the noise from the stock fans. You don't need more cooling capacity. The stock fans are loud at idle with no signal.
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post #3064 of 3193 Old 01-02-2020, 03:04 PM
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Quote:
Originally Posted by zeus33 View Post
Don't bother. It won't do anything to reduce the noise from the stock fans. You don't need more cooling capacity. The stock fans are loud at idle with no signal.

The fans on idle don't bother me as it is in a semi enclosed rack with other (larger/slower spinning) cooling fans. I'm trying to minimize the stock fans from spinning faster and making more noise. i haven't heard them spinning faster than idle since I haven't really used the amp yet, just hooked it up for testing.
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post #3065 of 3193 Old 01-11-2020, 12:44 PM
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I have 9 of these. Would 8 work well in an IB configuration, and with an existing subwoofer configuration, or will tuning them become more difficult with the IB (tunes flat already to 12.5 hz). The room has 2 full martysubs in the back with um18 in each, and 2 tekton cinemasubs in front (8 cu ft enclosures with 18” eminence drivers tuned to 22hz with a 300w bad amp in each).

Just trying to find the best fit for these...I could fit them under the projector screen on either side of the center channel, but I won’t have much space when I decide to upgrade to a larger center channel, and the tuning for a ported box at 18hz for ~10 cu ft leaves a roll off below 30 hz or so. The SLAPS setup was also a contender, (1 on each side but doesn’t take as much space) but I don’t really know how they would turn out vs. the ported cabs because winisd has the model coming out not looking so great.

I’m considering IB because the attic is right above this room (garage converted to a room) so it would be easy to access.


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post #3066 of 3193 Old 01-11-2020, 12:47 PM
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IB is fine, you just won't need nearly as much power as small sealed.
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post #3067 of 3193 Old 01-11-2020, 01:33 PM
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Why not use all nine (4 ohm magic square)?
Michael
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post #3068 of 3193 Old 01-11-2020, 06:00 PM
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Ok, quad opposed sample is officially complete. It's hard not to get excited about taking these budget JBL's and cleaning them up to perform at levels they have no business performing at.

Attached are pics.
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post #3069 of 3193 Old 01-11-2020, 06:01 PM
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Quote:
Originally Posted by LastButNotLeast View Post
Why not use all nine (4 ohm magic square)?

Michael


I’m Trying to build the IB cabinet balanced so there’s no shaking/movement....I’d like to use all 9 but I don’t see how without creating some difficult triangle cabinet or something.


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post #3070 of 3193 Old 01-11-2020, 06:10 PM
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Plans for my quad opposed sealed are attached:
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post #3071 of 3193 Old 01-11-2020, 06:14 PM
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Not that you need it, but un-eq'd response, close mic:
  • It's the same damn thing (of course!!!!) you guys get with the same woofers in similar small boxes, as expected.
  • Not sure if the little bump at 70hz is an artifact of my measurement technique, a reflection, or something about the design, but it doesn't show up far field.
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post #3072 of 3193 Old 01-11-2020, 06:15 PM
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Quote:
Originally Posted by Chris Popovich View Post
Ok, quad opposed sample is officially complete. It's hard not to get excited about taking these budget JBL's and cleaning them up to perform at levels they have no business performing at.



Attached are pics.


What dust caps did you use?


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post #3073 of 3193 Old 01-11-2020, 06:19 PM
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Originally Posted by Darthprater View Post
What dust caps did you use?


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The 6" ones I have 200 of. If you want some lmk. $4 ea. I went to a speaker builder/repair and grabbed nearly all he had. Epoxy on. You'll effectively raise the Qts a touch, but it ends up being less than 0.5dB at 20hz and we're doing serious EQ anyway.

Actual measured TS parameters from a dust capped JBL that's been broken in:
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post #3074 of 3193 Old 01-11-2020, 06:30 PM
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I still don't know what shipping will be, cost for a flat pack itself will be close to $200. The flat packs are not 100% perfect, meaning you need to have an orbital sander kicking around. It goes together really well though, I wasn't sure on some of the tolerances I used and was very very happy with how it turned out. I *could* change some design features, but after building it and feeling how sturdy it is, I'm not going to. It's larger internal volume (at a hair under 5 cuft) than the 4cuft partsexpress flatpack for the ultimax but really, REALLY doesn't look like it in the room -it looks FAR smaller due to the ~15.75" width. If I do say so myself, this is a very aesthetically pleasing shape. They're easy to stack and lay on any side you want. I even got compliments from the in-laws!!!

Anyone in Arizona near Phoenix, if you're interested in having some let me know before I place my order. I'm buying at least 10 more for myself. I have some friends at work that are going to pick up 4 or so each, so total order is getting larger, meaning we can all save on shipping if that's your thing. I have some friends from the East coast that want some, and they're going the pallet/freight route, but the details aren't ironed out yet. Probably will end up ordering 30 or so, all being spoken for.

These are big pieces, so if you're not in the Phoenix area and want some, you'll want to buy quite a few and ship on a pallet. I will do the math for anyone who wants me to, but I'd guess it's not even worth it for less than 4 of them.

Just shoot me a PM or whatever, I'm not in a giant rush for this since my wife got hurt I'm pulling Mr. Mom duty so there is zero percent chance I can build 10 more boxes any time soon, but I'd like to order in the next couple of weeks.

Chris
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post #3075 of 3193 Old 01-11-2020, 07:05 PM
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Quote:
Originally Posted by Chris Popovich View Post
It's the same damn thing you guys get with the same woofers in small boxes.
What were you expecting?
With your dual opposed design, I expect you'll be able to push the eq envelope further, though.
Michael
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post #3076 of 3193 Old 01-11-2020, 07:14 PM
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Originally Posted by LastButNotLeast View Post
What were you expecting?
With your dual opposed design, I expect you'll be able to push the eq envelope further, though.
Michael
It was exactly what I was expecting -just posted it as there is always someone who asks me how it compares to.... the same damn thing.

I will only be able to push eq further because I will have 40 of them and they won't be working as hard (each). Otherwise same/same. Force balanced box is nice though.

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post #3077 of 3193 Old 01-11-2020, 08:03 PM
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Quote:
Originally Posted by Chris Popovich View Post
It was exactly what I was expecting -just posted it as there is always someone who asks me how it compares to.... the same damn thing.

I will only be able to push eq further because I will have 40 of them and they won't be working as hard (each). Otherwise same/same. Force balanced box is nice though.

Chris
Yeah, i was starting to wonder what you were on about ! With 5 cu ft and 4 driver, that is as small as any of us are doing, LOL. That graph you posted is EXACTLY the same as mine

Anywho: TOTALLY AWSOME job on these, they look spectacular !! A bit unusual with the black dustcap, but look great
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post #3078 of 3193 Old 01-11-2020, 08:09 PM
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And here is another idea for these JBL’s:

Quote:
Originally Posted by Red Five View Post
@Nalleh , this is the one you have been wanting to see. I have a couple comparisons. The 1 cuft sealed and then a bass reflex with the same specs as the Nano. The box would have to get taller for bringing the resonate point down more.









Red Five has made a Nano Devastator suitable for the JBL . 4 of these placed around the room should be pretty cool.
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post #3079 of 3193 Old 01-12-2020, 06:30 PM
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That's cool... but ..... just run 10,000 sealed
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post #3080 of 3193 Old 01-14-2020, 07:04 AM
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Quote:
Originally Posted by Nalleh View Post
And here is another idea for these JBL’s:



Red Five has made a Nano Devastator suitable for the JBL . 4 of these placed around the room should be pretty cool.
Dammit.....I just finished building some ported cabs. Had I known he came up with this I would've built these!!
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post #3081 of 3193 Old 01-14-2020, 08:50 AM
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Progress pictures of my 1st of 5 sub enclosures for these JBL's. I built this one as a test to see how it sounds. If all works out I will be having the local woodworking shop take the cut list and create a flatpack for me. Cutting a 90lbs 4x8 piece of mdf is REALLY hard all by yourself. Currently I just finished routing all the edges and baffle, filling in the holes with drywall compound, and putting a mixture of water and titebond III on it to seal up the wood. Hopefully tonight I can paint it or I might just install all the speakers to see how it sounds. Did anyone else do anything besides just stuffing them with polyfill? I wasn't even sure they needed any stuffing at all.









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post #3082 of 3193 Old 01-14-2020, 08:56 AM
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Quote:
Originally Posted by Cotton1 View Post
Progress pictures of my 1st of 5 sub enclosures for these JBL's. I built this one as a test to see how it sounds. If all works out I will be having the local woodworking shop take the cut list and create a flatpack for me. Cutting a 90lbs 4x8 piece of mdf is REALLY hard all by yourself. Currently I just finished routing all the edges and baffle, filling in the holes with drywall compound, and putting a mixture of water and titebond III on it to seal up the wood. Hopefully tonight I can paint it or I might just install all the speakers to see how it sounds. Did anyone else do anything besides just stuffing them with polyfill? I wasn't even sure they needed any stuffing at all.

Do you have plans to add any bracing?
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post #3083 of 3193 Old 01-14-2020, 10:09 AM
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Did anyone else do anything besides just stuffing them with polyfill? I wasn't even sure they needed any stuffing at all.
Sealed boxes? LOTS of stuffing.
Michael
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post #3084 of 3193 Old 01-14-2020, 10:37 AM
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See results from my testing.

Take home is for smaller boxes (per driver) put at least 1 lb per cuft enclosure space, and up to 1.5 seems safe before overstuffing. This aligns with Tom Nousain's old work that came up with 1.7 lbs/cuft for small enclosures.
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Quote:
Originally Posted by Chris Popovich View Post
Ok, quad opposed sample is officially complete. It's hard not to get excited about taking these budget JBL's and cleaning them up to perform at levels they have no business performing at.

Attached are pics.
Beautiful build!
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post #3086 of 3193 Old 01-15-2020, 01:20 PM
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Quote:
Originally Posted by Chris Popovich View Post

Take home is for smaller boxes (per driver) put at least 1 lb per cuft enclosure space, and up to 1.5 seems safe before overstuffing. This aligns with Tom Nousain's old work that came up with 1.7 lbs/cuft for small enclosures.

I tried stuffing 1.5lb of polyfill in a 1.1cu.ft test box and after you fluff up the poly I decided to just go with 1lb. as 1.5lb was going to be tight. I also mounted the drivers magnet out (cool look actually) to ease wiring. Not sure how TN managed to do that with 1.5lb/cu.ft. "loosely packed". Unless "loosely packed" isn't really that loose. I thought TN said 1.5 not 1.7?
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post #3087 of 3193 Old 01-15-2020, 02:47 PM
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Quote:
Originally Posted by Arv View Post
I tried stuffing 1.5lb of polyfill in a 1.1cu.ft test box and after you fluff up the poly I decided to just go with 1lb. as 1.5lb was going to be tight. I also mounted the drivers magnet out (cool look actually) to ease wiring. Not sure how TN managed to do that with 1.5lb/cu.ft. "loosely packed". Unless "loosely packed" isn't really that loose. I thought TN said 1.5 not 1.7?
Yeah it's packed in there vs. just fluffed in. Make sure to measure internal cabinet dimensions to determine volume vs. trusting whoever made your box (they often fib!) and subtract for driver of course. I forget what I used for the JBL's, .1 cuft I think.

http://www.moodym.com/audio/fiber.html

Remember, his test box was 1.4cuft, but largest percentage gain was wish 1.75 lbs per cuft box size. 1.5 seems safe "heavily stuffed" range. 3lbs/cuft is definitely too much.
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post #3088 of 3193 Old 01-15-2020, 03:18 PM
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[QUOTE=Chris Popovich;59104754]
Quote:
Originally Posted by Arv View Post

Yeah it's packed in there vs. just fluffed in. Make sure to measure internal cabinet dimensions to determine volume vs. trusting whoever made your box (they often fib!) and subtract for driver of course. I forget what I used for the JBL's, .1 cuft I think.

http://www.moodym.com/audio/fiber.html

Remember, his test box was 1.4cuft, but largest percentage gain was wish 1.75 lbs per cuft box size. 1.5 seems safe "heavily stuffed" range. 3lbs/cuft is definitely too much.
Ah I see what your mean from the table. I was going on his recommendation/conclusion where he said 1.5lbs/cu.ft. for smaller boxes but if one would pack this much, it wouldn't really be loosely packed even more packed with 1.75 but I guess how loosely packed a box is very subjective so just stuffing 1.75 in there would be ok right?

Yeah I did measure to confirm, I also mounted the driver magnet out so I actually added volume &#x1f601;
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post #3089 of 3193 Old 01-15-2020, 04:57 PM
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Quote:
Originally Posted by DigiWega View Post
Do you have plans to add any bracing?

I do have 12 1" x 1" pieces of wood in all the corners of each one of the sealed compartments. This was only for stability since the completed box will be a little bit over 175lbs.
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Location: Phoenix AZ
Posts: 542
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I have a hernia/groin strain/torn ab/some BS that I haven't had time to get checked out yet (I will, soon) and moving my quad 12 box around was, um, interesting. Not 175, but heavy enough that the stream of curse words under my breath was steady. Bought sorbethane to put the box on. After moving it (and seeing how dead the dual opposed box is) ordered furniture sliders instead.
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