12" JBL speaker $29 on black friday at Bestbuy - Page 72 - AVS Forum | Home Theater Discussions And Reviews
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post #2131 of 2296 Old 05-23-2019, 11:12 AM
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I might have to go for a MiniDSP 2x4HD. I tried my old Anti Mode DSP with my existing Klipsch Subs and it gave me a worse curve in REW than my NAD with Dirac.

In the end I think I will be able to better manipulate the old Klipsch subs and the two arrays of 4 JBLs (so technically 3 Subs) with a MiniDSP.

One question, I heard the Behringers can have a hum and people are buying so-called DI boxes to counter that? When is this happening?
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post #2132 of 2296 Old 05-24-2019, 07:07 AM
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Any downside from having the double boxes very shallow? They will be 22cm (8.5 inches) deep in order to have them flush on the side walls. As long as the total volume is correct, it's going to be ok right?
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post #2133 of 2296 Old 05-24-2019, 09:41 AM
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Right.

Did you really need to quote that entire post in your reply?
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post #2134 of 2296 Old 06-02-2019, 06:56 PM
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I finally finished my 16 JBLs.

I’m running them with a pair of NX3000D amps. The amps give a very faint pop when the power strip comes to life. It’s barely noticeable.

I haven’t run much content through them yet, but they sounded great on the long bass solo in the live version of Brian Setzer Orchestra’s Stray Cat Strut and a few minutes of a battle scene in an Avengers movie.

I’m already thinking about adding 8 more, but not because I feel like I need more (at least not so far). I just think it would look cool to add two more boxes so that they span almost the entire front wall under the screen.
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post #2135 of 2296 Old 06-02-2019, 07:00 PM
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Quote:
Originally Posted by Blue View Post
I finally finished my 16 JBLs.

I’m running them with a pair of NX3000D amps. The amps give a very faint pop when the power strip comes to life. It’s barely noticeable.

I haven’t run much content through them yet, but they sounded great on the long bass solo in the live version of Brian Setzer Orchestra’s Stray Cat Strut and a few minutes of a battle scene in an Avengers movie.

I’m already thinking about adding 8 more, but not because I feel like I need more (at least not so far). I just think it would look cool to add two more boxes so that they span almost the entire front wall under the screen.
Looking good

Stormbreaker | Wisconsin Home Theater Meet Thread | B.M.D. (in progress)
You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
7.1.4 | Yamaha A3070 | Crown XLS 1502 | iNuke 3000 DSP | 2x Aphex 124A | 2x Bic EV15 | 7x Bic FH6 LCR | 2x Bic FH65-B | Sub 21" Stormbreaker | Epson 5010e | 120" DIY AT Screen
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post #2136 of 2296 Old 06-03-2019, 11:11 AM
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My cases are being built. The wait is killing me 😛
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post #2137 of 2296 Old 06-03-2019, 04:29 PM
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Quote:
Originally Posted by Blue View Post
I finally finished my 16 JBLs.

I’m already thinking about adding 16 more, but not because I feel like I need more (at least not so far). I just think it would look cool to add two more boxes BEHIND ME so that they LOOSEN MY BOWELS.
Fixed.

It's a great feeling too.
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post #2138 of 2296 Old 06-03-2019, 06:15 PM
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It's a little silly to ask this question after I'm finished, but how much polyfill would be too much? I stuffed a lot in each enclosure.

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post #2139 of 2296 Old 06-03-2019, 08:24 PM
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Less than or equal to 1.6lbs per cubic foot of net enclosure volume.

Chris
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post #2140 of 2296 Old 06-04-2019, 04:27 AM
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Less than or equal to 1.6lbs per cubic foot of net enclosure volume.

Chris
Thanks! By pure stroke of luck, I used 1.55 lbs per cubit foot. It was stuffed in there pretty tight to get that much in. But I had read in either this thread or another one to stuff it in there tightly.
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post #2141 of 2296 Old 06-04-2019, 04:33 AM
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Originally Posted by Madaeel View Post
Fixed.

It's a great feeling too.



The brown note.
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post #2142 of 2296 Old 06-04-2019, 11:47 AM
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How are people not clipping the heck out of an inuke when adding a low end boost on these?

Since WINISD doesn't offer a low shelf option I played around with parametric EQ. With any added any low end gain the amplified apparent load shoots up INSANELY high.
With 4 woofers in 5 cu total 6db centered at 25hz requires over 4000 watts and 3db is showing 2000 watts...

What am I missing?
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post #2143 of 2296 Old 06-04-2019, 12:17 PM
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Quote:
Originally Posted by goonstopher View Post
How are people not clipping the heck out of an inuke when adding a low end boost on these?

Since WINISD doesn't offer a low shelf option I played around with parametric EQ. With any added any low end gain the amplified apparent load shoots up INSANELY high.
With 4 woofers in 5 cu total 6db centered at 25hz requires over 4000 watts and 3db is showing 2000 watts...

What am I missing?
I don't think you're missing anything. In my case, I boost the heck out of the low end of a pair of UM18's (+9db LS I think) on one NU6000D and 8x of the 12" JBLs (+12db LS I think) on another NU6000D.

You'd think I'd be clipping but I think the truth is that I'm just no where near needing that kind of power output to get the bass level-matched to the mains. I run a house curve (maybe +5db hotter than the mains) but in my room, to get it to the loudest I can stand, it just doesn't take that much power.
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post #2144 of 2296 Old 06-04-2019, 12:38 PM
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So what about people using them on a 3000? I bought a XLS 2502 for 8 JBLs farfield and wondering whether I should be worried.
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post #2145 of 2296 Old 06-04-2019, 01:04 PM
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So what about people using them on a 3000? I bought a XLS 2502 for 8 JBLs farfield and wondering whether I should be worried.
Ok, I see what you mean. I punched in your 4 drivers, 5cuft, +6db @ 25Hz. Power goes off the chart.

I just dropped the "System Input Power" number (in the signal section) down from 1000W to 500W and the power output became something that the NU3000 could handle.

So I think this goes back to the fact that for all us guys boosting the low end with these, we're just not giving it full power and it's loud enough where it is.

Anyone else have any ideas on this?
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post #2146 of 2296 Old 06-04-2019, 02:29 PM
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Quote:
Originally Posted by Nima View Post
wondering whether I should be worried.
You should only be worried if you're trying to get these drivers down to 20Hz at reference from the other side of the room. Remember, these are car subs that are (were?) a bargain at $30; that's what sparked all the interest.
But to get them to go down really low, you need a lot of them and a lot of boost.
There's no free lunch.
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post #2147 of 2296 Old 06-04-2019, 04:20 PM
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Quote:
Originally Posted by Craig S King View Post
The brown note.
Haha hell yeah! Ain't nothing like it. I was almost blurring my vision the other day and I'm pretty sure I was around half of the Xmax.

Quote:
Originally Posted by goonstopher View Post
How are people not clipping the heck out of an inuke when adding a low end boost on these?

Since WINISD doesn't offer a low shelf option I played around with parametric EQ. With any added any low end gain the amplified apparent load shoots up INSANELY high.
With 4 woofers in 5 cu total 6db centered at 25hz requires over 4000 watts and 3db is showing 2000 watts...

What am I missing?
Box size is what you're missing. These drivers already have a high Fs and you have them in smaller boxes than ideal. You have 1.25cuft per driver when 2cuft per driver will get you the ideal Qtc. So you need more power than what the ideal size box would require. I have a clone on my 16 which are in cabs that give around 1cuft per driver. That's no bueno either, but it was a design choice because of space, and I'm definitely amp limited even with a clone which I'm starting to like. I can clip the amp way before the drivers. Cept with 16 behind me I never venture that far. Solution is bigger boxes. You can also never go wrong with more power either. It'll give you more headroom to boost with. Most guys using the iNukes use larger boxes iirc.
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post #2148 of 2296 Old 06-04-2019, 05:35 PM
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I really think the sims don't tell the whole story when you use a small box. Maybe it wouldn't be a big deal with a very powerful motor in a higher-end subwoofer, but these things like a larger box, or at the very least if you want a tiny box have a bunch of them. I get better excursion and bottom end before obvious distortion from 6 JBL's powered by a xls1502 in 1.6 cuft each vs. 4 powered by a 2502 in 1.2 cuft, both stuffed, etc. What I'm saying is that smaller box with more eq and more power does not equal a larger box with less power and less boost, and the reason is I think we're just near limits of a $30 driver that likely cost Harmon between $5-$10. If you can make the box bigger, within reason, IMO do it. If not, don't sweat it, but make sure you have 10 dozen or so (lol).
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post #2149 of 2296 Old 06-04-2019, 06:46 PM
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make sure you have 10 dozen or so (lol).
I'm pretty sure that, between us, we do.

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post #2150 of 2296 Old 06-04-2019, 07:08 PM
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I posted about power usage somewhere long ago. Running out of power? Add more boxes and or drivers. Its that simple. You will use less power this way.

16 drivers = +24db at 1 watt each without any boundary gain included.

So 16watts gets you roughly 115db at 1m. (I dont remember the sensitivity exactly)

Ok so you boost the low end. Maybe you need 10x the power? 160 watts. Boosting even more you say? 100x the power? 1600 watts.

Without boundary gain.
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post #2151 of 2296 Old 06-05-2019, 01:21 AM
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Sorry to ask a question like this but this whole DIY Subwoofer business is totally new for me.

So when I have 3.5 cf double boxes housing two JBLs (2 double boxes on each side 8 JBL in total roughly 6.5 feet from the couch) my Crown XLS 2502 will suffice?

TIA
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post #2152 of 2296 Old 06-05-2019, 04:56 AM
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Quote:
Originally Posted by Nima View Post
Sorry to ask a question like this but this whole DIY Subwoofer business is totally new for me.

So when I have 3.5 cf double boxes housing two JBLs (2 double boxes on each side 8 JBL in total roughly 6.5 feet from the couch) my Crown XLS 2502 will suffice?

TIA
You'll have 4x JBLs on each channel with the JBLs on each channel maxed out at 1000W (4x250W) with the Crown capable of 775W on each channel. So it's *possible* to clip the amp before you've hit max power for the JBLs but the question is, will you actually *use* that much power? If I already had the amp, or could get a good deal on one, I'd do it.
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post #2153 of 2296 Old 06-05-2019, 07:20 PM
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post #2154 of 2296 Old 06-06-2019, 06:08 AM
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I suggest flipping the rears upside down so the tweeters are closer to ear level.
If you can still hear anything, that is.

Michael

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post #2155 of 2296 Old 06-06-2019, 07:21 PM
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Absolutely!! I just have to get a projector mount for this room; so, I can fit the other subs on this wall...........and...
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post #2156 of 2296 Old 06-07-2019, 04:47 AM
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Jay? Are you there? Can you hear me now?

Did you really need to quote that entire post in your reply?
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post #2157 of 2296 Old 06-07-2019, 06:32 AM
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Lol, it's for the dynamics, not the ridiculously loud levels in which I can and do listen at from time to time.
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post #2158 of 2296 Old 06-07-2019, 07:09 AM
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I was referring to your posts, which are coming up jabberwocky (at least on my PC).
Michael

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post #2159 of 2296 Old 06-07-2019, 07:41 AM
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Mine too. I just thought it was foul language
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&#115 = s

...and it all makes sense.
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