Dual Opposed 18" LMS's..... "The XLerators" - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 51 Old 08-06-10, 01:46 PM Thread Starter
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Dual Opposed 18" LMS's..... "The XLerators"

Design Criteria

3 Dual Opposed Boxes - 6 x 18" LMS drivers

Double Wall top, bottom and sides 3/4" 13 ply birch
13.3 gross 9.5 CuFt net without bracing and drivers.
Box dimensions external - 25x28x33
Magnetic Grills
Extensive Bracing
Large Rounded Corners
Aluminum Legs
Mahogany Veneer

Room size is 8200^3 open to everywhere, need extreme clean deep output.
Sealed is preferred.

Power - 6 x 4000w (1 Crest 8002 per driver)
EQ - DCX 2496
3 x 30 amp circuits

Contracted John from AE Speakers to build the boxes, I couldn't do this nice of work, nor did I have the time.






Amp rack with Supermicro server - 24 hot swap bay for streaming media













Still awaiting the last box, and then measurements will start and be posted.

Last edited by Warpdrv; 04-25-12 at 10:08 AM.
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post #2 of 51 Old 08-06-10, 02:56 PM
dwr
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Re: Dual Opposed 18" LMS's..... "The XLerators"

Hey warpdrv those are absolutely beautiful, and nice looking system you have there too. What are the main speakers, and what electronics are you using?

Dan
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post #3 of 51 Old 08-06-10, 03:08 PM Thread Starter
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Re: Dual Opposed 18" LMS's..... "The XLerators"

Thanks dwr its been a long journey.... I figured, since I learned so much from this site I should post this build for the archives for ref.

System consists of
Paradigm Sig S8, C5 and S2's, Infinity rear surrounds.
Anthem D2v, Wyred4Sound 7 ch amp
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post #4 of 51 Old 08-06-10, 03:25 PM
dwr
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Re: Dual Opposed 18" LMS's..... "The XLerators"

Nice!!!.....Real Nice!! That D2v is about as good as it gets as far as processors go. Make sure you post your measurements, you may not need to EQ the subs. I am running a Maelstrom X 18" and a Dayton 15" in sealed enclosures with a DCX-2496 for bass management and EP-4000s for power and as of now I am not using any EQ. I will be starting room measurements soon too. I will get my preamp back from being modified at the end of the month and will then begin measurements.
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post #5 of 51 Old 08-06-10, 03:29 PM Thread Starter
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Re: Dual Opposed 18" LMS's..... "The XLerators"

This room def needs EQ, at least it did with 3 x LMS's + 15" TC3K

Too many sound waves bouncing around and colliding in here mushing things up.

I'll be running sweeps when I get the last box and results will be posted, certainly feels good now though... but thats just not good enough for me - gotta make sure everything is just right...
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post #6 of 51 Old 08-06-10, 03:37 PM
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Re: Dual Opposed 18" LMS's..... "The XLerators"

Yep, I know just what you mean. I'm running a total of 5 subs, the two mentioned above plus a 12" peerless that work with the min speakers for 2 channel listening and then a pair of 15" Daytons in sono tubes with 18" passive radiators for the H/T. So for movies I have all 5 in operation. I thought I would have to go with 3 circuits like you have but I am getting away with 2 circuits. My room is a little "deader" than yours appears to be it will be interesting to see the measurements from the two rooms.
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post #7 of 51 Old 08-06-10, 10:14 PM
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Re: Dual Opposed 18" LMS's..... "The XLerators"

Absolutley awesome! From the subs to the equipment rack simply amazing!
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post #8 of 51 Old 08-06-10, 10:20 PM
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Re: Dual Opposed 18" LMS's..... "The XLerators"

Hey Bambino do you think those are the best looking yet of all the diy subs we've seen on here.....I do.
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post #9 of 51 Old 08-06-10, 10:30 PM
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Re: Dual Opposed 18" LMS's..... "The XLerators"

They definatly rank among the highest that is for sure, they look like they came from a highend speaker manufacturer. I'm curious to know if the Paradigms can keep up with them, i think they will give them a run for there money.
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post #10 of 51 Old 08-07-10, 12:05 PM Thread Starter
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Re: Dual Opposed 18" LMS's..... "The XLerators"

Thanks guys.... I was trying to go for something that would work well and look good in my room. You really have to give John @ AE Speakers the credit for doing such a nice looking job on the boxes, he truly is a genius with CAD and his building skills are spectacular. I highly recommend his boxes for his kits.

BTW, the Sigs have no problems keeping up with these subs - they get plenty loud and are very clean, It was more important for me to get the subs to give me at least 10db over the mains and maintain it with integrity, in a room this size - that was asking quite a bit.

Last edited by Warpdrv; 08-07-10 at 03:06 PM.
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