Hornsub with LMS-R ? How to construct ? - Page 3 - AVS Forum
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post #61 of 74 Old 09-24-2012, 02:58 PM
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thanks ricci.

if vtc (volume inside the 18" rings) and atc (area of the 15" hole) is the correct way to model the chamber, it doesn't seem to make a material difference (1/2 db shift in some frequencies).

is 1.5" enough clearance in front of the lms-u?

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post #62 of 74 Old 09-27-2012, 07:13 AM - Thread Starter
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Well, one LMS-Ultra has been ordered, and will be put to trial in the same cabinet.


The owner has this "itch"... upgraditus itch. He will not stop with this LMS-Ultra.

Next in line will be 2x Neo Pro-5100's.. (for midbass).


I wonder if it will ever end!
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post #63 of 74 Old 09-27-2012, 03:16 PM
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myg, what main speakers is your buddy running? he might actually get more "bass" by upgrading them, rather than going for more more than an lms-ultra in that big horn. with lms-u and proper power, that bass horn should be belting out around 130db from 20hz up. unless outdoors or in an imax theater setting, that really should be sufficient, for even the craziest bass guy.

in any event, i look forward to what you guys do and will help however i can. :-)

edit: ah, i see that i read your post too quickly. 2x5100's for midbass. :-) not sure if you need to spend that kind of money, but that will work.

over there, a pair of 18sound 15lw2400 drivers per side may be the better value for midbass, and yes, with proper power, they will split your eardrums.

maybe start with one per side and see if you can even take it. :-) if not enough, go for two. [ouch]

http://www.eighteensound.com/index.aspx?mainMenu=view_product_simple&pid=315

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post #64 of 74 Old 09-28-2012, 02:30 AM - Thread Starter
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For him it's all about "overkill". With the LMS-R (horn), there is just no way you can sit and "enjoy" the insane bass coming from it. For some minutes? Sure, but not much more than that. Yet he wants more.


I too think he would appreciate some 15s for midbass, for instance 2 x JBL 2226Hs like I run. But as I said, he wants everything to be total overkill. But we'll see.. Perhaps I will be able to talk some sense into him wink.gif

But first: LMS-U in that horn!
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post #65 of 74 Old 09-28-2012, 09:40 PM
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i hear ya. there is a point though where overkill turns to waste. for each person that is different level and i support every person who knows what they have and chooses to go for more.

jbl prices have gone through the roof though, which is why i suggested the 18 sounds. it may actually outperform the 2226h by a bit in the range he is looking for.

just for fun, post a pic or two of the lms-u going into the cab.

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post #66 of 74 Old 09-29-2012, 05:37 AM
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Quote:
Originally Posted by LTD02 View Post

myg, what main speakers is your buddy running? he might actually get more "bass" by upgrading them, rather than going for more more than an lms-ultra in that big horn. with lms-u and proper power, that bass horn should be belting out around 130db from 20hz up. unless outdoors or in an imax theater setting, that really should be sufficient, for even the craziest bass guy.
in any event, i look forward to what you guys do and will help however i can. :-)
edit: ah, i see that i read your post too quickly. 2x5100's for midbass. :-) not sure if you need to spend that kind of money, but that will work.
over there, a pair of 18sound 15lw2400 drivers per side may be the better value for midbass, and yes, with proper power, they will split your eardrums.
maybe start with one per side and see if you can even take it. :-) if not enough, go for two. [ouch]
http://www.eighteensound.com/index.aspx?mainMenu=view_product_simple&pid=315


How much does the 18sound 15lw2400 usually go for?
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post #67 of 74 Old 09-29-2012, 11:29 AM
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i seem to recall seeing it around $300 or so, but i'm not sure.

loudspeakersplus claims that they will beat anybody's price, so you might check with them.

it appears that they have the jbl 2226h for $368, which is pretty good given the giant price increase of the jbl's a little while back, if anyone is trying to hunt down some new ones.

the 18 SOUND_15LW1401 would also work great for a mid-bass. cowan thought that they actually outperformed the 2226h paired with his unity horn. he had planned to use two per side, but discovered that one per side was sufficient. in stock for $300.

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post #68 of 74 Old 10-10-2012, 02:37 PM - Thread Starter
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15hjki.jpg

Ultra in place !
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post #69 of 74 Old 10-10-2012, 02:39 PM
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Crazy!

Mi gusta. smile.gif

My Dual 18" LLT subs 120dB down to 10hz

 

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post #70 of 74 Old 10-10-2012, 09:49 PM
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hopefully, that will be sufficient. :-)

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post #71 of 74 Old 10-16-2012, 01:39 PM
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curious as to the performance vs. the previous driver. have you and your friend had time to evaluate/compare?

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post #72 of 74 Old 10-22-2012, 09:23 AM - Thread Starter
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I will ask him about differences.. im curious myself, because I haven't heard the Ultra yet.

When he had the LMS-r, we took alot of measurments (Using my EMC8000 + RS Meter etc), and it was within +/- 5dB If I remember correctly. I'll ask if he has the measurements still.

--- We never noticed those nasty peaks as shown in the simulations..!



Anyway, he wants to move on to his next project.

He now wants the Pro 5100 18" from TCSounds, and he only wants it for midbass. Would he be better off with a ported cabinet, or is it possible to make a horn for this woofer also? The range he has in mind is from ~50-200hz.
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post #73 of 74 Old 10-22-2012, 11:52 AM
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I have a couple 15" LMS-R's that need a home, and have thought about a beast similar to this. Any chance this could be slimmed down ~4" or so in width without much compromise?
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post #74 of 74 Old 10-22-2012, 11:33 PM
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"Would he be better off with a ported cabinet, or is it possible to make a horn for this woofer also?"

a horn could probably be designed. ported would get you 126-127 db at the 2000 watts rated program power.

the problem is the driver handles 'only' 2000 watts program.

for that frequency range, he might take a look at the b&c 21sw152-4. it is a 21" driver with a huge 6" voice coil to dissipate heat. as a result it can handle 4000 watts program. ricci measured one in a sealed enclosure with bursts in the 136db range (rescaled to 1m).

in a ported enclosure, it has about 1db more sensitivity and with double power, you get another 3db, so it would have about a 4db edge on 5100.

4000 watts gets you 130db in model from 50-200hz.

"I have a couple 15" LMS-R's that need a home, and have thought about a beast similar to this. Any chance this could be slimmed down ~4" or so in width without much compromise?"

since the horn has four passes horizontally, reducing width by one foot reduces the horn length by four feet. that raises the corner up to around 25hz or so. i'd probably look for another design in that form factor vs. modifying this one.

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