12" JBL speaker $29 on black friday at Bestbuy - Page 67 - AVS Forum | Home Theater Discussions And Reviews
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post #1981 of 2220 Old 04-16-2019, 09:34 AM
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Quote:
Originally Posted by LastButNotLeast View Post
So the JBL boxes are each wired in series (8 ohms), then wired together in parallel to the amp (4 ohms), to 2+ and 2-.
As long as the boxes are equidistant from the mlp, you'll be okay.
Michael
Great, ... but this needs digging more from my part:
1 Correct, I have 2+2 wires coming to the amp from the two Jbl boxes.
2 The amp is actually configured as double mono, and I believe it can stay so.
3 My original question is what is the better option to link 4 wires into the Neutrik, as I believe I can't get two wires (+) and two wires (-) into each of the two slots, whatsoever is their numbers! Unless I can use all four slots in the single Neutrik for the Jbl channel
Please get back
Thanks again for your help
Alessandro

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post #1982 of 2220 Old 04-16-2019, 09:49 AM
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US address - I've always had this problem for some reason. Hopefully I can figure something out for the next sale.

My credit cards have been funny with US addresses every now and then in the past. Now I use my bank card's Visa functionality and I have 0 issues. They don't care what address I use.

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post #1983 of 2220 Old 04-16-2019, 10:12 AM
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One Walmart Deep Pockets pillow, about one pound per box.
That's kind of light on the stuffing as far as polyfill goes.
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post #1984 of 2220 Old 04-16-2019, 11:51 AM
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Originally Posted by vn800art View Post
So, I am now on the same boat, because I finished a single V.B.S.S. 18' and I will drive it on a channel of the 3000. On the other channel I will have to put the 2x2 Jbl's, which previously were in parallel 2 for channel. I have now prepared the lines in series/parallel, but I reach the amplifier with four cables which I have to connect in a single Speakon!
What's the best way to do this, when I count soldering and isolated taping outside of the Speakon as the worst choice?
Thanks for your advice(s)
Regards
Alessandro
I wired mine as per the attached diagram. This presents the inuke with a 4 ohm load which is ideal. Just a single positive and negative wire is all it will take. I used spade connectors for the speaker wire and for the terminals that required two connections I used a banana plug in addition to the spade connector (see the photo attached). No soldering required!
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post #1985 of 2220 Old 04-16-2019, 11:53 AM
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Does anyone have a build thread on what I can copy for 8 sealed subs off a NX3000D?


I pulled the trigger on this setup and am looking for a good place to start. I have never built a speaker so be kind I have built my entire theater room myself so I am ok at building stuff. Just need some help.



Should I start my own build thread? I don't want to pollute the forums with anymore data that's already available. I read over 20+ pages of this thread and cant find where someone had this setup. I know I read it somewhere..... I will keep reading....
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post #1986 of 2220 Old 04-16-2019, 12:03 PM
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Originally Posted by Stereodude View Post
That's kind of light on the stuffing as far as polyfill goes.
I would have had to stand on it to get more in and still have room for the speaker.
I really don't think anyone would NEED any more. Measurements for such things are hard to find and inconclusive. SOME stuffing is needed, for sure.
Michael

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post #1987 of 2220 Old 04-16-2019, 12:05 PM
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Measurements aren't hard to find and aren't inconclusive!

My Computer JBL's are probably pretty well broken in, do you goons (I say that with affection and tenderness) need me to do DATS sweeps with zero stuffing, add stuffing sweep/etc. I'm game. I think I slightly overstuffed them anyway.

Maybe this weekend?

Anyone give a hoot?
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post #1988 of 2220 Old 04-16-2019, 12:09 PM
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Quote:
Originally Posted by jpolachak View Post
I have built my entire theater room myself so I am ok at building stuff. Just need some help.
Should I start my own build thread?
How much do you want to do yourself? Each speaker needs a box about 1.5 cf in size. Or put them together in one box that is the appropriate multiple of 1.5 cf.
I gave up on DIY, so I did this:
https://www.avsforum.com/forum/155-d...fer-array.html
Several people have used premade dual boxes from several different companies. You can get a quad box and make two if you like the tower look and only need/want subs in two places. Or you can make your own box of eight (not recommended, just an amusing thought).
Yes, start your own thread, but put a link to it here. We're all eager to cheer you on.

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post #1989 of 2220 Old 04-16-2019, 12:10 PM
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Quote:
Originally Posted by Chris Popovich View Post
Anyone give a hoot?
I'd LOVE that. Go for it!
Michael

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post #1990 of 2220 Old 04-16-2019, 12:12 PM
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Quote:
Originally Posted by LastButNotLeast View Post
I would have had to stand on it to get more in and still have room for the speaker.
I really don't think anyone would NEED any more. Measurements for such things are hard to find and inconclusive. SOME stuffing is needed, for sure.
Michael
I put 8oz (0.5lb) in a .7ft^3 Volt-10 enclosure and there wasn't any pushing the driver up. In fact there was hardly even any touching the driver. I don't see how 1lb in 1.5ft^3 could possibly be tight. I've seen tests that tested polyfill density up through and even past 2lb/ft^3.

Quote:
Originally Posted by Chris Popovich View Post
Measurements aren't hard to find and aren't inconclusive!

My Computer JBL's are probably pretty well broken in, do you goons (I say that with affection and tenderness) need me to do DATS sweeps with zero stuffing, add stuffing sweep/etc. I'm game. I think I slightly overstuffed them anyway.

Maybe this weekend?

Anyone give a hoot?
I give a hoot and would be curious to see the results of your tests.
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post #1991 of 2220 Old 04-16-2019, 12:17 PM
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Originally Posted by Stereodude View Post
I put 8oz (0.5lb) in a .7ft^3 Volt-10 enclosure and there wasn't any pushing the driver up. In fact there was hardly even any touching the driver. I don't see how 1lb in 1.5ft^3 could possibly be tight.
Because my boxes aren't 1.5cf; they're 1.2cf without the speaker. So I think we're actually very close to the same page.
Let's have Chris do his thing, anyway.
Michael

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post #1992 of 2220 Old 04-16-2019, 12:18 PM
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ok, I just ordered a hanging scale so it'll be easy to be somewhat accurate with the weight of the stuffing. Before I was doing it with a normal kitchen scale and that's a PITA. I'll do zero stuffing, and a few iterations that make sense through optimal for that particular enclosure and post it up. Probably this weekend.

Chris
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post #1993 of 2220 Old 04-20-2019, 11:02 AM
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Before I get rolling on the stuffing stuff, some (maybe?) good news. Those 6.5" dustcaps I picked up from PSI (fixmyspeaker.com) earlier? Well they look great but at ~$8.50 per (plus shipping) it can add up with many woofers (6 of them was $54.75 shipped). While I think the JBL is still a good value, it's less of a good value paying that. Robot Underground is near me (they're in Mesa AZ) and going out of business, I happened by and he has the exact same dustcaps. I picked up a bunch of them at a good discount for my projects figuring I could either use them all or turn a few over to any of you guys who might be interested if any of you are turned off by the ugliness of the stock cap. If enough of you want them I'll just swing by again this coming week and grab more of them for you.

I guess post here or PM me and we'll work it out? If you're at all interested it's as good of a deal as I think you're going to find for $4 plus whatever shipping is. They're polypropylene, plain black, 6.5". Patrick recommended a slight scuff to both the glue area on the cone as well as the bonding area of the dustcap before gluing and leaving overnight.

100% guaranteed to have been inspected by Walter, who assures me he is an expert in all things inspectable.


Edit: Priority mail is about $8.00 to ship. Also, the dustcaps weigh ~29g. 10 of them were 286g on my scale, I wouldn't bet the farm on the scale accuracy but it's going to be close to that for anyone that wants to model the impact of increasing mms. No clue what the stock JBL cap weighs, I wasn't planning on removing them, I like a little extra mms for my purposes.
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post #1994 of 2220 Old 04-20-2019, 11:15 AM
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I’m torn on these. It looks cleaner yes, but then also makes it looks like some rando driver and nothing special lol......

I may snag two for my upward firing drivers in the sonotubes, so they don’t draw attention away from the sub....


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post #1995 of 2220 Old 04-20-2019, 12:25 PM
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Quote:
Originally Posted by Chris Popovich View Post
Before I get rolling on the stuffing stuff, some (maybe?) good news. Those 6.5" dustcaps I picked up from PSI (fixmyspeaker.com) earlier? Well they look great but at ~$8.50 per (plus shipping) it can add up with many woofers (6 of them was $54.75 shipped). While I think the JBL is still a good value, it's less of a good value paying that. Robot Underground is near me (they're in Mesa AZ) and going out of business, I happened by and he has the exact same dustcaps. I picked up a bunch of them at a good discount for my projects figuring I could either use them all or turn a few over to any of you guys who might be interested if any of you are turned off by the ugliness of the stock cap. If enough of you want them I'll just swing by again this coming week and grab more of them for you.

I guess post here or PM me and we'll work it out? If you're at all interested it's as good of a deal as I think you're going to find for $4 plus whatever shipping is. They're polypropylene, plain black, 6.5". Patrick recommended a slight scuff to both the glue area on the cone as well as the bonding area of the dustcap before gluing and leaving overnight.

100% guaranteed to have been inspected by Walter, who assures me he is an expert in all things inspectable.
PM'd.

BTW, what type of glue did you end up using? Was it Patrick's Gorilla Jizz (that's what he calls it), or something store bought?
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post #1996 of 2220 Old 04-20-2019, 01:30 PM
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PM replied to, original post updated.


Glue I was recommended to use is: https://www.simplyspeakers.com/speak...e-mi-3035.html
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post #1997 of 2220 Old 04-20-2019, 06:23 PM
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Wife doesn't mind the speakers, but she's allergic to cats.
Sorry.

Michael
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post #1998 of 2220 Old 04-20-2019, 09:38 PM
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Wife doesn't mind the speakers, but she's allergic to cats.
Sorry.

Michael

So am I! Walter is a Balinese, which is basically a Siamese (long haired recessive gene). They're considered hypo-allergenic, which isn't really true, but most people have no allergic reaction to the breed. I have friends with children who are dangerously allergic to cats who have come over and buried their faces in Walter with no ill effects (testing to get the same breed for them!) His personality is a whole different issue, best cat ever, although high maintenance. Comes when called, plays fetch, jumps up on command, opens drawers, has a favorite mouse, plays chase with my wife, intentionally plays tricks on us, walks us to the door when we go to work, greets us at the door when we come home. Strangers? Says hi and sits on their lap within 1 minute. Amazing creature. Also giant pain in the ass, you don't get that much personality without paying for it. If you want an aloof cat that isn't doing pretty much anything you are doing with you... wrong breed. Despite my appearance (300 lb shaved head linebacker/ex powerlifter look), he made me a crazy cat person. I accept this.

Back to JBL's. I completed the stuffing tests, will post probably tomorrow.

Chris

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post #1999 of 2220 Old 04-21-2019, 04:10 AM
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on sale again: https://www.bestbuy.com/site/jbl-gx-...?skuId=6283643

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Must... resist.... buying.... more....
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post #2001 of 2220 Old 04-21-2019, 05:06 AM
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Hmm. Should I stick with 16 and drive them with two 6000D amps (4 subs per channel), or get two more drivers, set up two magic squares (nine JBLs per each magic square), and use only one 6000D amp (one magic square per channel). Buying two more subs with one amp is cheaper than buying an extra amp. Does everyone think a single 6000D will supply plenty of power for 18 of these bad boys?

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post #2002 of 2220 Old 04-21-2019, 05:45 AM
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on sale again:
They must be growing them in the basement.
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post #2003 of 2220 Old 04-21-2019, 05:47 AM
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Does everyone think a single 6000D will supply plenty of power for 18 of these bad boys?
I'm driving 9 on one channel of a 3000:
https://www.avsforum.com/forum/155-d...fer-array.html
Go for it.
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post #2004 of 2220 Old 04-21-2019, 06:19 AM
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A iNuke 6k will do about 1800 watts x 2 @ 4 ohms. Each sub is rated for 250 watts.

1800/9 = 200 watts.

You’d be “under powering them, but I doubt you’d notice.


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post #2005 of 2220 Old 04-21-2019, 06:33 AM
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My 6000 has never thumped. In fact it’s very clean when shutting off.
Its only the dsp versions that thump if I recall. I'm going to see if my new NX6000d thumps...I assume it will so will wire in a relay for auto on/off.
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post #2006 of 2220 Old 04-21-2019, 07:08 AM
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Its only the dsp versions that thump if I recall. I'm going to see if my new NX6000d thumps...I assume it will so will wire in a relay for auto on/off.
I've got an NU6000 (non-dsp) and it thumps. It's a slight annoyance but it won't harm the sub.
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post #2007 of 2220 Old 04-21-2019, 09:02 AM
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Its only the dsp versions that thump if I recall. I'm going to see if my new NX6000d thumps...I assume it will so will wire in a relay for auto on/off.

My 6000 is a DSP model.

Leave it at 8 ohms and call it a day :)
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post #2008 of 2220 Old 04-21-2019, 10:21 AM
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Gosh darn it. The JBL tick is real?!? Why did two subs just now double?!? What am I even supposed to do with 4???

Leave it at 8 ohms and call it a day :)
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post #2009 of 2220 Old 04-21-2019, 10:31 AM
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Small box JBL Stuffing Results:

Ok, all done. For better or worse, here we go:

Test Equipment:
  • JBL GX1200
  • 1.25 cuft box (net)
  • DATS V2
  • Poly-Fil Premium Polyester Fiber used as stuffing
  • Red Breast 12 Year Irish Whiskey

Test Methodology:
  • All testing (except free air) was accomplished with driver in the vertical position to facilitate easier installation/removal and avoid moving box/test equipment.
  • Driver screw torque was normalized each time to minimize the chances of fastener related leaks.
  • Stuffing was measured 3 times and measurements consistent within 5g

Comments:
  • JBL specs not quite per spec sheet
  • Data normalized to 1 cuft
  • Estimated that data is valid for 1~2 cuft sealed boxes
  • Some of the repeating data was cause for eyebrow raising, so several data-sets were re-performed with slight (expected) data shifting on all parameters except Fs, leading me to conclude the 3 decimal place repeating Fs was more an artifact of DATSV2 measurement technique.
  • The overstuffed dataset (2.9 lbs stuffing, 2.32 lbs/cuft) results were repeatable. Subjectively, I don't recommend this much stuffing although I acknowledge it measured better with small signal analysis, increased distortion was obvious at large excursions.
  • The above notwithstanding, a trend is easily visible

Conclusions:
  • For small boxes, I recommend about 1.6 lbs of stuffing per cuft of net enclosure volume
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Last edited by Chris Popovich; 04-21-2019 at 10:37 AM.
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post #2010 of 2220 Old 04-21-2019, 11:11 AM
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Thank you for the info, Chris.

The mfr specs made it seem like a great candidate for a lilwrecker tapped horn. Your real-world measurements (using TS from the zero stuffing box) say otherwise.
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