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Old 23rd September 2011, 01:38 PM   #21
Ile is offline Ile  Finland
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If you need to go also low, IB installation using attic as backspace is one option. Then you need just 8 LMS-5400 with 30kW or 12 FI IB318 with 11 kW.

Simulation have 4'th order high pass at 15Hz to get more output without bottoming drivers below 20Hz. Room should add few db to low end.
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Old 23rd September 2011, 01:58 PM   #22
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Build 4 TH-18's with whatever driver you want, and use the 3015lf's you currently have for midbass....
and add another RMX 2450...
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Old 23rd September 2011, 02:09 PM   #23
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This the the link to the spreadsheet I used to come up with my numbers.
In the past I have compared it's figures against other speaker design programs and is at least within 10% and/or better with the figures from winlsd.
So,Anyway, I trust it.

Yes you can get 140db at 50hz fairly easy,But as you go lower your displacement requirements go up drasticaly.

justint, Had specified 40hz so I was going for a lower frequency's of 25hz to 35hz as this would help to compensate for the extreme excursion and thus lowering the THD at 40hz at that level.
Although you may not hear the difference in the room, But, If the system was outside you would.

http://www.linkwitzlab.com/spl_max1.xls


jer
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Old 23rd September 2011, 02:48 PM   #24
jbell is offline jbell  United States
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Quote:
Originally Posted by salzburgsoundsystem View Post
we need a suitable design for Justin's 3015LF

If you can give him 140 dB @ 30Hz from a pair of them, I will be very impressed!

Regards, Ben
Not gonna happen ben... extension and spl are the two players on the see-saw (as you know)

justint built don's upandback TH that goes low(er), is small(er), and gives up some spl.

The ss15 wouldn't quite get there in pairs in a perfect corner... but it gets in the ballpark.

The tradeoff? no 35hz. Others have found 32hz 24db/oct butterworth high pass will let you get some under 40hz in a ss15 while keeping it safe within xmax bounds. The room will depend on how 'flat' it actually gets below Fc.

If you are a spl nut, and have others that live in the house with you.... I can't imagine bringing in anything bigger than a pair of ss15. It'll get you spl, you just have to give up the really really low notes.
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Old 23rd September 2011, 03:36 PM   #25
epa is offline epa  Netherlands
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1 th ~550ltrs with 18 sound 21nlw9000c with 2000 watts input(no compression calculated)
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one good thing about music ,when it hit you feel no pain.
so hit me with music
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Old 23rd September 2011, 03:45 PM   #26
6L6 is offline 6L6  United States
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To the original poster - You do know that exposure to 140db causes instant hearing loss?
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Old 23rd September 2011, 04:00 PM   #27
wg_ski is offline wg_ski  United States
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Unfortunately, it won't fit. But it would do the job. Oh, and you need 14kW for the bass section.
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Old 23rd September 2011, 04:23 PM   #28
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Here's the very, very easy way to do it:

Build a large sealed enclosure, say about 3x4x6 feet. Design it so that the back can hinge open and install a normal 12" subwoofer (Free air type?) in the baffle. Power with 100W, that's plenty.

Now here's the trick: to listen to the subwoofer, open the hatch, get inside, and lock it behind you. Inside the small "cabin" the SPLs will easily reach 140dB, and you will not cause any structural damage to your home although your hearing will likely be destroyed in only a couple of seconds.

This is why it is possible to launch those stupid SPL wars in a car, but not in a home. Duh.

-Charlie
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Old 23rd September 2011, 04:35 PM   #29
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Ahhhh,ha,ha,ha,ha,ha Too Funny!

Nice System ,wg-ski, I like !!!

jer
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Old 23rd September 2011, 04:36 PM   #30
jbell is offline jbell  United States
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now that there is funny stuff -- I don't care who you are......
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