12" JBL speaker $29 on black friday at Bestbuy - Page 55 - AVS Forum | Home Theater Discussions And Reviews
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post #1621 of 2449 Old 02-26-2019, 11:20 AM
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Quote:
Originally Posted by LastButNotLeast View Post
So does this question belong elsewhere?
Michael
I don’t think it matters, as long as you are within the amps spec. And you are in all those examples.

Besides, if the amp don’t like the load, it will just go i to protect. No worries

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post #1622 of 2449 Old 02-26-2019, 11:22 AM
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But if it goes into protect, then I have a problem with the load, and I have to rearrange the speakers.
That's a worry, so I'd like to know (if I can) ahead of time.
Michael

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post #1623 of 2449 Old 02-26-2019, 11:45 AM
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^^ If it doesn’t like the load, that mean you are outside spec, and as i said: you are within spec, so you should be fine with either of your options. I run mine with different load, no problem

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post #1624 of 2449 Old 02-26-2019, 03:23 PM
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Ohm load per channel doesn’t matter as long as it’s not outside ratings .


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post #1625 of 2449 Old 02-26-2019, 03:33 PM
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Quote:
Originally Posted by LastButNotLeast View Post
So does this question belong elsewhere?
Michael

Depends on a few things, driving large woofers with strong motors at low frequencies, they are best used with a bridged amplifier. ( no bus pumping )


I suspect you should be fine. I had an NU3000DSP die driving a pair of woofers on one channel and a compression driver on the other, but it was getting old.

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post #1626 of 2449 Old 02-26-2019, 04:50 PM
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Quote:
Originally Posted by LastButNotLeast View Post
So does this question belong elsewhere?
Michael
I'd imagine you want the same impedance per channel if not then you run the risk of pulling more power to one channel then the other, and thereby reducing the power left for the other channel. There's only one power supply in the 3000 right?
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post #1627 of 2449 Old 02-26-2019, 07:20 PM
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Kinda depends on the amp. Some of the big clones get cranky if one channel isn't used/etc. Seems most of the guys run into issues when there is no load on the other channel. The scenarios you posted should all be fine, you may want more power but that's a different problem.
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post #1628 of 2449 Old 02-27-2019, 01:07 PM
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Currently showing post 1620 of 1616 (last post on prev page), so obviously still not working properly.
In the meantime, I'm running the system just fine with one 15" sub, so I'll just take the other channel and hook up the JBL array when it's ready.
Unless one of the four messages I can't read yet has a better suggestion.
Michael

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post #1629 of 2449 Old 02-27-2019, 03:31 PM
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Quote:
Originally Posted by LastButNotLeast View Post
So does this question belong elsewhere?
Michael
I answered but it doesn't show up for some reason? Anyway, no worries. Some amps get cranky with no load on one channel, but you'll be fine.

Chris
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post #1630 of 2449 Old 02-27-2019, 04:22 PM
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Quote:
Originally Posted by LastButNotLeast View Post
So does this question belong elsewhere?
Michael
Yes, something strange in this thread ATM. Seems stuck on your post as last ?!?

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post #1631 of 2449 Old 02-27-2019, 04:53 PM
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Quote:
Originally Posted by Chris Popovich View Post
Yep, she's an open floor plan with the listening position against one of the walls and the main speakers acoustically in the center of a large room. I tried things the other way around; mains on/near wall and listening position towards middle, but that ended up being a black hole of bass, and when I did make things a little better, I was pretty sure my sliding glass door was going to give up the ghost.

I figured I'd do MSO on eveything but the nearfields, then manually blend the nearfields to volume/desired tactile response. I definitely do not want the same target curve on them as the rest of the system for reasons we all understand. I think DIRAC will make this easier with both different target and levels very easy to run and change. I hope. Ha!

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I sit like 12' back from my wall, behind MLP is another 12 to 14', so it certainly gets interesting if I go stand at the back wall. Bass out the wazoo. MLP is good though lol.

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post #1632 of 2449 Old 02-27-2019, 04:56 PM
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I clicked on the first page and then the last page popped up. Otherwise every time I clicked on the link for last post it'd go to page 54.
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post #1633 of 2449 Old 02-27-2019, 05:03 PM
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Seems to be fixed now. Thanks for the responses.
The speakers are on their way, but I'm holding off on the enclosures for a bit.
Looking forward to lots of experimentation!
Michael

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post #1634 of 2449 Old 02-28-2019, 02:31 AM
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Quote:
Originally Posted by LastButNotLeast View Post
Currently showing post 1620 of 1616 (last post on prev page), so obviously still not working properly.
In the meantime, I'm running the system just fine with one 15" sub, so I'll just take the other channel and hook up the JBL array when it's ready.
Unless one of the four messages I can't read yet has a better suggestion.
Michael
I've been running my NU6000 on only one channel (4 ohm load to an 18) for about a year now with now issue. I have never seen anything in any literature stating that all channels of any amp must have a load on them or risk the amp dying. It seems counterintuitive to not run all channels, but electrically there should not be any problem with it.
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post #1635 of 2449 Old 02-28-2019, 06:04 AM
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Some class D amps get cranky with one channel being loaded and bus pumping, but IIRC the 6000 is already bridged, so it shouldn't (I think?) be an issue. When the amp is bridged the problem effectively goes away.

https://www.infineon.com/dgdl/an-107...53559538eb0ff1
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post #1636 of 2449 Old 02-28-2019, 12:28 PM
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Posted some videos of these JBL's in action as a tactile transducer for single digit ULF in some movie demo scenes. It's called the BOSS (Baffle Open Sub Shaker) in my theater build link below if anyone is interested in an alternate use for these little beauties.
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post #1637 of 2449 Old 03-02-2019, 07:10 PM
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Quick build question with theses JBLs: mine finally arrived and I noticed that they have what seems to be a gasket on the top, but nothing behind the flange. Are you guys using gasket tape between the flange and box or are you finding simply screwing them in as-is is enough to seal the enclosure?
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post #1638 of 2449 Old 03-02-2019, 08:33 PM
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Quick build question with theses JBLs: mine finally arrived and I noticed that they have what seems to be a gasket on the top, but nothing behind the flange. Are you guys using gasket tape between the flange and box or are you finding simply screwing them in as-is is enough to seal the enclosure?
Use gasket tape, like the rolls of thin, narrow, foam sticky stuff used for weather stripping.
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post #1639 of 2449 Old 03-03-2019, 07:58 AM
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post #1640 of 2449 Old 03-03-2019, 08:00 AM
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12" JBL speaker $29 on black friday at Bestbuy

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Originally Posted by Rcris View Post
My dual jbl towers are on sell list

https://www.avsforum.com/forum/209-a...ed-4-sale.html


Can I ask why?


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post #1641 of 2449 Old 03-03-2019, 08:41 AM
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Can I ask why?


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I guess to make way for upcoming projects.
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post #1642 of 2449 Old 03-03-2019, 08:43 AM
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I guess to make way for upcoming projects.


Spill the beans bro......


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post #1643 of 2449 Old 03-03-2019, 08:48 AM
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Something to do with the other 11, perhaps?

Did you really need to quote that entire post in your reply?
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post #1644 of 2449 Old 03-03-2019, 12:11 PM
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Quote:
Originally Posted by LastButNotLeast View Post
Something to do with the other 11, perhaps?
But why have 11 if you can have 19?

If I was close I'd pick these up. I just put 8 of these drivers up front and put my two UM18's behind the seating. I like it. Debating on whether to replace the 18's behind the seating with 8 more JBLs....
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post #1645 of 2449 Old 03-04-2019, 07:52 PM
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Spill the beans bro......


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I already bought few subs for Horns before this deal came up at BB and ended up building them prior to horns.


Since I have subs lying around and can't stop the itch of building horns and listen them out. I have 11 in spare anyway if I've to come back to jbls.



Building picowrecker to start with and also planning to try out F20(max box size i can fit in due to jbl 4722s taking up majority of the space.


Nothing against these !
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post #1646 of 2449 Old 03-04-2019, 08:07 PM
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Quote:
Originally Posted by Rcris View Post
I already bought few subs for Horns before this deal came up at BB and ended up building them prior to horns.


Since I have subs lying around and can't stop the itch of building horns and listen them out. I have 11 in spare anyway if I've to come back to jbls.



Building picowrecker to start with and also planning to try out F20(max box size i can fit in due to jbl 4722s taking up majority of the space.


Nothing against these !


Horns are RAD. Good luck


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post #1647 of 2449 Old 03-05-2019, 12:48 PM
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Hello everyone, I recently picked up a couple of JBL CX1200's and I'm thinking I'd like to build two separate down-firing enclosures for them. They will be used in our living room which is approx 20'D x 24'W x 14' to 18'H sloped ceiling. My first choice would be to have them double as end tables (something similar to the V.B.S.S. DIY subwoofer design w/ legs added) or alternately at each end of the entertainment center - whichever size or configuration would produce better sound. My question to the experts here is what should the ideal port size/length and internal volume be for each enclosure?
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post #1648 of 2449 Old 03-05-2019, 01:04 PM
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Currently at Sonic for $40 less 10% with "refund10."
Free shipping, tax only in KY.
Beats my refurb price!
Michael
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post #1649 of 2449 Old 03-05-2019, 01:14 PM
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Quote:
Originally Posted by linux247 View Post
My question to the experts here is what should the ideal port size/length and internal volume be for each enclosure?
The second page of the spec sheet would have told you that.
1.75cf, round port 10" x 4"
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Did you really need to quote that entire post in your reply?
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post #1650 of 2449 Old 03-05-2019, 01:30 PM
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Quote:
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The second page of the spec sheet would have told you that.
1.75cf, round port 10" x 4"
Michael
Maybe for music, but for HT usage they are much better suited with a LOT more volume. It takes 4 JBLs in 3.6cf each (14.4cf total) to equal a single UM18 Full Marty in ULF. That's with the same 1200W, same 15Hz tune (this holds true with any tune in the teens BTW):


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