15-18" sub (s) enclosure LLT - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 99 Old 01-15-12, 09:43 PM Thread Starter
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15-18" sub (s) enclosure LLT

I'm looking to do my first DIY subwoofer. I'd probably looking at picking up a behringer 2500 (price point seems right), and then grab 1-2 15" or 18" subs.

I want to go loud and low--so the LLT seems to be the right direction. I don't want to do a sonotube, they seem a bit unwieldy and I can't really make it blend anywhere.

I've read a bit about the new mach drivers now "UXL?" - and they seem like they'd be nice, but no telling when they'll be available. I'd like to pay around that amount for one, or two subs (i.e. keep the price point at 500ish for two subs, or for one)--whatever would work best.

I have a couple of options for placement, both very different sizes. The front of the room can accomodate an enclosure 60" long, 20" high, and 24-30" deep. I think that's my best bet--but who knows. The second location is one that is directly beneath the built in cabinet, in a closet. The space below the rack has about 36" to the floor, 24-30" wide, and could be a couple feet deep--this is directly adjacent to the seating area (sub would fire into the side of the seating area). It would basically be built into the closet, but fire outward--not sure what this does to 'room' gain or how it affects it.

So, I'd like to be tuned and flat down to 15hz, use the behringer eu2500 amp, and hopefully someone could recommend subs that would work well. Room is 22'x15'x8.5' --its not sealed and does open to the rest of the house (via one opening).

Any help or recommendations would be greatly appreciated. I currently have 2 HSU vtf15h, and would like to keep them in the mix if they would help, rather than hurt.

phone pic with general placement - between the two subs, replacing my make-shift center channel stand


or

build into the closet.

in the end, its all about how to get the most out of whatever sub i choose--and be able to find a design/tune that works... lots of examples to find, but hard to find teh same drivers everyone has used in previous builds... no mals, the new machs arent out, xxx re audio subs are giant and a bit pricey...

thanks!
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post #2 of 99 Old 01-16-12, 11:40 AM
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Re: 15-18" sub (s) enclosure LLT

60" long x 20" high x 30" deep is an internal volume of 17.8 cu.ft. The only dual driver LLT application that would fit that volume, be in your price range, and work well with a an EP2500 is the Mach 5 Audio IXL-15.2.2.
They model well in 14 cu.ft. tuned to 15 hz. Each driver would handle 850 watts from each channel of the amp. Vertical slot ports at each end of the cabinet would be 1.5" wide x 18.5" high x 42.75" long.
Both ports and drivers would displace 2.5 cu.ft. allowing for 1.2 cu.ft for bracing. Assuming you live in the United States both drivers would be $508 shipped.
The EP2500 is no longer available, the current amp that replaces it is the EP4000 which in reality is a re-badged EP2500.

15-18" sub (s) enclosure LLT-1xl15.jpg




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post #3 of 99 Old 01-16-12, 11:46 AM Thread Starter
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Re: 15-18" sub (s) enclosure LLT

Mike thanks so much for the response--

the size of the box isn't a requirement, just more or less giving the space that I have to work with, i could go + a bit, but I can definitely go smaller if needed.

I've been reading some threads with some pretty amazing PR + tc sounds 15" - but i have no idea where to even begin to try and model that. My attempts at modeling thus far, end up with a very strange plots.

Per the ep2500--I actually just bought one from a guy on avs... so it should be the ep2500.

I'm all for a mach5 or something, but everything looks out of stock and I heard the owner had health issues and is a bit behind in production?
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post #4 of 99 Old 01-16-12, 12:04 PM
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Re: 15-18" sub (s) enclosure LLT

For your budget Dual IXL-15's will outperform a LMS-R15. The Mach 5 website shows they are currently available.




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post #5 of 99 Old 01-16-12, 12:20 PM Thread Starter
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Re: 15-18" sub (s) enclosure LLT

Mike, my bad--i was looking at the 18's--not the 15's. For the money, is there anything worth reaching up for --i.e. 350/sub 400/sub that would get better response down low and still be efficient enough to be powered by the ep2500?

Also, for the port, and location of the sub--does it matter which way they fire?

example, if i were to build a cabinet that is 60" long, would it be best to have the subs firing forward, or on opposite ends? Would the ports be placed on the same face as the sub, and does it matter if they're above/below/left/right of the driver?

The airspace is shared by the drivers in the enclosure you modeled?

I do live in the US--so the price point is good on those subs. I'd look at ordering today. I also messaged the guy that designs the enclosures in google sketchup, to see if he had anything existing that would be close to this (30 vs 75).
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post #6 of 99 Old 01-16-12, 12:37 PM
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Re: 15-18" sub (s) enclosure LLT

Quote:
is there anything worth reaching up for --i.e. 350/sub 400/sub that would get better response down low and still be efficient enough to be powered by the ep2500?
Not in the available space that you have. For LLT, most drivers need much more space. A single 18 would work, but dual 15's outperform it.
Quote:
Also, for the port, and location of the sub--does it matter which way they fire?
As long as nothing is interfering with it. For example you wouldn't side fire a driver or port it it's going to be 3" from a wall.
Quote:
The airspace is shared by the drivers in the enclosure you modeled?
That is correct.
Quote:
I also messaged the guy that designs the enclosures in google sketchup, to see if he had anything existing that would be close to this (30 vs 75).

Something along the line of the last pic is post #2 would be my personal choice (with 2 drivers)

http://www.hometheatershack.com/foru...n-service.html






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post #7 of 99 Old 01-16-12, 12:58 PM Thread Starter
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Re: 15-18" sub (s) enclosure LLT

Ah, yes that cabinet does look right up my alley. Good call!

So, do I need a lpf/hpf - it will be powered by the behringer, and the behringer controller by a denon 4311...

For mounting the subs, I'd guess I'd need something like this:
http://www.parts-express.com/wizards...TOKEN=26494653

With that amp, I'll be using the L/R and not mono--so two sets of binding posts? (best way to connect?)

My other issue will be running power to it. I can try to position it closer to the subs so I dont have to run speaker cable as far, otherwise it's probably 30-40' of wire-distance to the subs.
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post #8 of 99 Old 01-16-12, 01:10 PM
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Re: 15-18" sub (s) enclosure LLT

No LPF/HPF need. the low pass is done by your Denon, usually 80 hz. You won't need a hi pass with a 15 hz tuning, you're safe from over excursion for 99% of the movies available.

Yes, you will need 2 sets of binding posts. Each sub is wired for 4 ohms, one sub per channel of the amp.
Quote:
For mounting the subs, I'd guess I'd need something like this:
http://www.parts-express.com/wizards...TOKEN=26494653
Go with the 10/32's, 1/4" is too big for the majority of drivers.






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post #9 of 99 Old 01-16-12, 01:37 PM Thread Starter
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Re: 15-18" sub (s) enclosure LLT

Ok, I've ordered (2) Mach 5 Audio IXL-15.2.2

Behringer is on the way...

I'll order binding posts and mounting kits.

Do I need polyfill, or any internal dampening?
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post #10 of 99 Old 01-16-12, 01:48 PM
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Re: 15-18" sub (s) enclosure LLT

Build the sub and see how it sounds first, then take it from there.




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