12" JBL speaker $29 on black friday at Bestbuy - Page 68 - AVS Forum | Home Theater Discussions And Reviews
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post #2011 of 2350 Old 04-22-2019, 12:05 PM
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Great data Chris. Thank you for doing that. Great to see real-world evidence. I've got to go stuff a little more into my boxes now......
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post #2012 of 2350 Old 04-22-2019, 01:02 PM
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With the recommended 9 subs for a 4-ohm load, do they have to all be in the same area or can they be spread out? I already have four double sub boxes (8 subs total) to the right and left of my center channel speaker so adding and 9th would not be a problem but would be a single subwoofer on its own most likely placed on the floor under my center.
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post #2013 of 2350 Old 04-22-2019, 01:10 PM
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You get an increase in spl if they are close together (I believe they need to be closer than the width of the speaker).
No difference in FR. I ended up having my three towers of three about a yard/meter apart.
You may have timing issues if they are different distances to the mlp, however.
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post #2014 of 2350 Old 04-22-2019, 07:40 PM
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Quote:
Originally Posted by mlkmgr View Post
With the recommended 9 subs for a 4-ohm load, do they have to all be in the same area or can they be spread out? I already have four double sub boxes (8 subs total) to the right and left of my center channel speaker so adding and 9th would not be a problem but would be a single subwoofer on its own most likely placed on the floor under my center.
They'll be treated as one speaker so yes, they should be fairly close to one another, since you can't independently adjust eq or delay to them. If you are going to space them out, IMO at least make them equi-distant from the main listening position.

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post #2015 of 2350 Old 04-22-2019, 08:00 PM
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You get an increase in spl if they are close together (I believe they need to be closer than the width of the speaker).
No difference in FR. I ended up having my three towers of three about a yard/meter apart.
You may have timing issues if they are different distances to the mlp, however.
Michael
The acoustic centers need to be closer than the wavelength/4 for a 6dB increase in total radiated power.
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post #2016 of 2350 Old 04-22-2019, 08:41 PM
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So, since we're dealing with subs, they can be pretty far apart (relative to cone diameter).

Good to know. Thanks.
Michael

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post #2017 of 2350 Old 04-22-2019, 08:57 PM
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That's the theory, but the room does weird things. I've measured subs that were fairly close together (~8 ft) that needed some delay change to best match at 30-50hz ranges.

This is partly why I'm just going to make a million subs. We gonna solve this problem.
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post #2018 of 2350 Old 04-23-2019, 04:42 AM
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The other part is that it's just lots of fun!
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post #2019 of 2350 Old 04-23-2019, 04:54 AM
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Quote:
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So, since we're dealing with subs, they can be pretty far apart (relative to cone diameter).
Well if I did the math right, at 80Hz that's only 3' from acoustic centers.
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post #2020 of 2350 Old 04-23-2019, 06:00 AM
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Sure, but at 20Hz it's 14 feet. And even 3 feet is "pretty far apart."
[I originally thought they had to be within half a cone diameter]
Michael
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post #2021 of 2350 Old 04-23-2019, 08:42 AM
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I finally finished my first build of 4 JBL's in a single box. Then in March I bought 4 more, and installed two into my riser. Then I bought 4 more the other day when they were on sale

Ill be doing another mini-riser for my front row to add some tactile response.



I hooked the 4 jbl box up to my Inuke 3000DSP. I didn't do any configuration to it, the 4 jbls are on CH B and wired as a 4 ohm load. I didn't plug the riser in yet as I wanted to dial in the box first.

Here is my problem, I don't have REW/UMIK or anything of that sort.

What are some suggestions on what I can do to get this roughed in? I watched Hunter Killer and thought the bass was lacking a little bit.

Is there an area on the forum to ask for volunteers with their equipment to help tune? I would love to get the UMIK and REW but am already tight on time with all of my other projects, I just don't think I have time to learn the process on my own
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Quote:
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This is partly why I'm just going to make a million subs. We gonna solve this problem.
The BTH approach, good choice!
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post #2023 of 2350 Old 04-23-2019, 09:06 AM
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Quote:
Originally Posted by Chris Popovich View Post
That's the theory, but the room does weird things. I've measured subs that were fairly close together (~8 ft) that needed some delay change to best match at 30-50hz ranges.

This is partly why I'm just going to make a million subs. We gonna solve this problem.

You should build them in quad opposed boxes, a mini version of BTH's bass towers Then proceed to line all the walls!
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post #2024 of 2350 Old 04-23-2019, 11:03 AM
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I watched Hunter Killer and thought the bass was lacking a little bit.

The bass in Hunter Killer is not "lacking" at all, so something is definitely not right.
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post #2025 of 2350 Old 04-23-2019, 01:34 PM
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IIs there an area on the forum to ask for volunteers with their equipment to help tune? I would love to get the UMIK and REW but am already tight on time with all of my other projects, I just don't think I have time to learn the process on my own

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post #2026 of 2350 Old 04-23-2019, 01:45 PM
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Originally Posted by ndenial View Post
I finally finished my first build of 4 JBL's in a single box. Then in March I bought 4 more, and installed two into my riser. Then I bought 4 more the other day when they were on sale

Ill be doing another mini-riser for my front row to add some tactile response.
Nice job on that box and the riser!

REW isn't that difficult to learn but I'd be glad to come help if you're close.
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post #2027 of 2350 Old 04-23-2019, 04:53 PM
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What are some suggestions on what I can do to get this roughed in? I watched Hunter Killer and thought the bass was lacking a little bit.
LS6 +9dB @ 20Hz will be a good start.
Michael
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post #2028 of 2350 Old 04-23-2019, 05:17 PM
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Thanks for the feedback, all. I used Hunter killer to show off my new 1099's that I built and was impressed over the Bose 301's that they replaced. I was really hoping to get some real bass with this sub.

I'm in York, PA. Would love to host a bash if anyone's close. I haven't ran YPAO on the system yet as I still need to put the 1099s in their resting spot behind the screen. Time and help are always hard to find.

I'll set the inuke up with those starting parameters now and report any difference.

Thanks! You all have been feeding this addiction for a long time and I've just started to get my feet wet. I've been lurking for probably 10 years or so it seems lol. Although the DIY area I just started looking last year.
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post #2029 of 2350 Old 04-23-2019, 06:00 PM
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OMG. I have no idea what just happened. I put a ls6 +9db @ 20hz on the inuke and put the gain from the 12oclock to the 2oclock position.

Started Hunter killer and not more than 5 minutes in I thought my projector was going to fall.

Talk about giddy and a (4 letter word) eating grin!
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post #2030 of 2350 Old 04-23-2019, 08:15 PM
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We know what happened.
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See my sig.
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post #2031 of 2350 Old 04-24-2019, 05:06 AM
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We know what happened.
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Haha! Yup. I'm using a +12db LS @20hz with these. (I've also got a negative HS filter a little higher up). Seems extreme, but REW graphs show that it gets me pretty flat to 20Hz.

Your LS filter just brought in the LF and flattened the response to what it should be.
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post #2032 of 2350 Old 04-24-2019, 06:19 AM
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Quote:
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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.

Those look really good with the new dustcap! Very presentable.



Quote:
Originally Posted by femi View Post

Femi, how many JBL 12's will you need to add up to one of your JTRs? lol.


Quote:
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I finally finished my first build of 4 JBL's in a single box. Then in March I bought 4 more, and installed two into my riser. Then I bought 4 more the other day when they were on sale

Ill be doing another mini-riser for my front row to add some tactile response.

I really like how you did the riser sub! I'll have to keep that in mind for when I do mine. So how does that work, do the legs of your chairs/couch rest or mount on the raised lip? Or did you remove the legs and place the couch directly on the 2x4 lip?


Also I really want to get your impressions when you do fire it up, this is exactly what I planned to do for my back row. I was wondering if 2 will have much of an impact. Did you build them ported or sealed?
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post #2035 of 2350 Old 04-24-2019, 11:21 AM
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On sale again? Bought 4 more again.
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On sale again? Bought 4 more again.

My finger must have slipped also, 2 more are on the way.
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Leave it at 8 ohms and call it a day :)
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Originally Posted by ndenial View Post
OMG. I have no idea what just happened. I put a ls6 +9db @ 20hz on the inuke and put the gain from the 12oclock to the 2oclock position.

Started Hunter killer and not more than 5 minutes in I thought my projector was going to fall.

Talk about giddy and a (4 letter word) eating grin!
And thats why you have to use DSP with them. I run mine at around 12-1 oclock and just let them go, my walls and room and ceiling all creek during the first few minutes while the subs pound away lol. Huge bang for buck. Also, thats why I have no problem running 8 up front and nothing nearfield.

OP of this thread deserves an award.

- 6 BA CR6 array center channel, QSC AD-S82 L/R, 4 jbl 8330a surr , 8 jbl 12" subs w/Inuke 6000. JVC rs420, Denon x4000, Sony x800 -
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OP of this thread deserves an award.
Or jail time. I haven't decided which.
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Or jail time. I haven't decided which.
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Possible divorce paperwork too.

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post #2040 of 2350 Old 04-24-2019, 04:09 PM
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Quote:
I really like how you did the riser sub! I'll have to keep that in mind for when I do mine. So how does that work, do the legs of your chairs/couch rest or mount on the raised lip? Or did you remove the legs and place the couch directly on the 2x4 lip?


Also I really want to get your impressions when you do fire it up, this is exactly what I planned to do for my back row. I was wondering if 2 will have much of an impact. Did you build them ported or sealed?
The riser is open baffle. I got the idea from the B.O.S.S. thread. It's for tactile response. My 4x12 JBL box sits behind that. I'm going to get my front one done before I hook them up so I can run the front/rear as a single channel at 4 ohms.

The lip is to rise the seat up just a little more and to make sure the speakers don't hit anything. My couch doesn't have any feet just metal frame. I zipped some cabinet screws through the frame to the wood lip to solidly mount it and make sure the vibrations don't knock it off.

I'll give feed back on how it works out when done. Thanks for the response!
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