8x 18" LMS 5400 Ultras Sealed to 27 Cube 15hz Ported Build - Page 4 - AVS Forum
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post #91 of 512 Old 02-19-2014, 01:18 PM
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+1 and the value gets even better with a pair on a 3000dsp, or quads on a 6000dsp.
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Listen. It's All Good.
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post #92 of 512 Old 02-19-2014, 01:39 PM
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Yep, and instead of the Police showing up after reports of gunfire the Army shows up after reports of Cannon Fire, haha smile.gif
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post #93 of 512 Old 02-19-2014, 02:37 PM
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Thats funny Bob biggrin.gif
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post #94 of 512 Old 02-19-2014, 10:37 PM - Thread Starter
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One left, then a bunch of cleanup... dust and wood chips all over frown.gif

B0UuDe2.jpg
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post #95 of 512 Old 02-19-2014, 10:49 PM
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Just open the doors and let the ports blow the room out! biggrin.gif

EDIT: Added the smiley face so people know I was being sarcastic. smile.gif

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post #96 of 512 Old 02-19-2014, 10:53 PM
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you should invite all the hedge fund managers to drop by on their way out to the hamptons for a listen...seriously. next thing you will be installing $1 million audio systems for them and will be celebrating 'dust and wood chips'! :-)

Listen. It's All Good.
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post #97 of 512 Old 02-19-2014, 11:05 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post

you should invite all the hedge fund managers to drop by on their way out to the hamptons for a listen...seriously. next thing you will be installing $1 million audio systems for them and will be celebrating 'dust and wood chips'! :-)

Hah, like they want big ugly speakers in their expensive houses wink.gif

The wood chips are mostly from the piece of ****** ply when I was setting it up under the couch for the transducers. I can't wait to have this build done.

Now that my sealed enclosures are all decommissioned, anyone want to buy cheap? =]
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post #98 of 512 Old 02-19-2014, 11:26 PM
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Just wow. lol the the ported boxes definitely look menacing! Seeing all this DIY stuff gets me interested in doing a SI 18 build or that marty sub if I could fit it!

No subwoofer I've heard has been able to produce the bass I've experienced in the Corps!

Must..stop...buying...every bluray release...
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post #99 of 512 Old 02-20-2014, 12:50 AM
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Quote:
Originally Posted by SeekingNirvana View Post

Just open the doors and let the ports blow the room out!

That joggled loose a simmering realization and what you said is not really far-fetched - you actually can use a ported box as a fan.

Years ago I was showing off a new ported sub to a friend and fellow mechanical engineer.

I was playing a 35 Hz sine wave at high level and told him to feel the air near the port.

He looked around the box for other openings and asked in wonderment "Where's the air coming from?!"

I told him it was just an illusion because it was AC flow.

That's true but it's highly asymmetric, like the airflow at the inlet and outlet ports on a shop vac; the former draws in air from all directions at low average velocity outside the port and can only be felt within several inches, while the latter shoots the air in a high velocity directional stream for many feet.

I'm sure a port behaves the same way, and this is supported by a conversation I had years ago with the dislustrious Carlos Beltran (designer of Acoupower high end sub drivers).

I asked him how his cooling system could be effective when the voice coil area can't breathe in both directions - wouldn't it just draw in the hot air it just squirted out?

The answer was no; same as above, most of the air that's squirted out is ejected far away, and cool air from all directions nearby is drawn in.
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post #100 of 512 Old 02-20-2014, 08:17 AM
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Not,

Why does your screen look like a 32" in this picture?? smile.gif
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post #101 of 512 Old 02-20-2014, 08:29 AM
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Quote:
Originally Posted by noah katz View Post

That joggled loose a simmering realization and what you said is not really far-fetched - you actually can use a ported box as a fan.

Years ago I was showing off a new ported sub to a friend and fellow mechanical engineer.

I was playing a 35 Hz sine wave at high level and told him to feel the air near the port.

He looked around the box for other openings and asked in wonderment "Where's the air coming from?!"

I told him it was just an illusion because it was AC flow.

That's true but it's highly asymmetric, like the airflow at the inlet and outlet ports on a shop vac; the former draws in air from all directions at low average velocity outside the port and can only be felt within several inches, while the latter shoots the air in a high velocity directional stream for many feet.

I'm sure a port behaves the same way, and this is supported by a conversation I had years ago with the dislustrious Carlos Beltran (designer of Acoupower high end sub drivers).

I asked him how his cooling system could be effective when the voice coil area can't breathe in both directions - wouldn't it just draw in the hot air it just squirted out?

The answer was no; same as above, most of the air that's squirted out is ejected far away, and cool air from all directions nearby is drawn in.

Very interesting!

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post #102 of 512 Old 02-20-2014, 08:42 AM
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I like seeing these pics and showing them to my wife. It makes whatever I have planned seem like a compact micro system :P
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Originally Posted by notnyt View Post

One left, then a bunch of cleanup... dust and wood chips all over frown.gif

B0UuDe2.jpg
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post #103 of 512 Old 02-20-2014, 08:47 AM
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Originally Posted by Anthony_Gomez View Post

I like seeing these pics and showing them to my wife. It makes whatever I have planned seem like a compact micro system :P

Haha, yeah, me too. It makes whatever I'm thinking about WAY more acceptable. Thankfully, she enjoys it too and doesn't mind much of what I throw in the room as long as I can make it look decent, hence the reason for my 8 month long curved builds.

Notnyt, get it done, man! We want to see the finish photos!
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post #104 of 512 Old 02-20-2014, 09:00 AM
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Haha, yeah, me too. It makes whatever I'm thinking about WAY more acceptable. Thankfully, she enjoys it too and doesn't mind much of what I throw in the room as long as I can make it look decent, hence the reason for my 8 month long curved builds.

The funny thing is, I have HER permission to build 2x full martys and I am the one who is hesitating and thinking they are too big. I feel I should just hand in my HT Mancard :P It sure helps to be able to model the room to see just how big these things are!

..then I look back to these massive, glorious, LMS towers in this thread.
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post #105 of 512 Old 02-20-2014, 09:05 AM
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I feel I should just hand in my HT Mancard :P


That is hilarious! Maybe it will make you feel better if you tape up some 24"x24"x24" cardboard boxes and bring them in the room and have your wife take a look at them. Maybe once she actually see the girth, she may share the same hesitation that you do smile.gif
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post #106 of 512 Old 02-20-2014, 09:07 AM
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That is hilarious! Maybe it will make you feel better if you tape up some 24"x24"x24" cardboard boxes and bring them in the room and have your wife take a look at them. Maybe once she actually see the girth, she may share the same hesitation that you do smile.gif

That's just it! I already have a 24x24x24 sub in that room and I told her that 2x marty is having 4 of those, stacked 2x2. her response. "I can see that you would like this, so go ahead."
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post #107 of 512 Old 02-20-2014, 09:09 AM
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Originally Posted by Anthony_Gomez View Post

That's just it! I already have a 24x24x24 sub in that room and I told her that 2x marty is having 4 of those, stacked 2x2. her response. "I can see that you would like this, so go ahead."

She's a keeper! Have at it!
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post #108 of 512 Old 02-20-2014, 09:11 AM
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Originally Posted by notnyt View Post

My current low end setup, chronicled here, consists of 8x LMS Ultra 5400s in sealed enclosures with 4x FP14000 powering them, pictured below. Kind of absurd to upgrade, but that's what this project is about. I feel the sealed enclosures I built left a lot on the table under 40hz that I can pick up by going with a vented alignment.
What levels do you listen at (85db = ref?) That's some serious firepower
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post #109 of 512 Old 02-20-2014, 09:31 AM
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Ok I see some serious problems here! There is too much empty space above your speakers so it is time to add a few things. I can see some 4732's to fill in the gaps(just add midhorn) and also the center channel and then get a screen that will cover it all or at least the speakers, just a suggestion.
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post #110 of 512 Old 02-20-2014, 09:45 AM - Thread Starter
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Not,

Why does your screen look like a 32" in this picture?? smile.gif

Lol, that's a 10' screen wink.gif
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post #111 of 512 Old 02-20-2014, 09:51 AM
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Lol, that's a 10' screen wink.gif

Wow, I never would have guessed that. Perspective sure makes a difference. For comparison, here's my 10' wide screen. I'd kill to have your size room. redface.gif

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post #112 of 512 Old 02-20-2014, 09:51 AM
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Lol, that's a 10' screen wink.gif

Haha so awesome. Since I have 3677's I know how big just your center is. Absolutely love it. Your theater is what inspired me to go with the jbl's. Love the look...great job on the new boxes.
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post #113 of 512 Old 02-20-2014, 09:56 AM - Thread Starter
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What levels do you listen at (85db = ref?) That's some serious firepower

I have my subs boosted about 9db generally for movie content. I use Dynamic EQ which boosts even further, but generally watch around -10 to -5, but sometimes louder.
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post #114 of 512 Old 02-20-2014, 09:58 AM - Thread Starter
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Originally Posted by bass addict View Post

Wow, I never would have guessed that. Perspective sure makes a difference. For comparison, here's my 10' wide screen. I'd kill to have your size room. redface.gif

Different aspect ratio, my screen is 1.85:1 wink.gif 10' diagonal... 5' tall, 126" diagonal including the black border. The back wall there is about 25', so lots of room for the monster subs wink.gif

Each sub stack is about 4' wide and 8' tall lol.
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post #115 of 512 Old 02-20-2014, 10:06 AM
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Originally Posted by notnyt View Post

Different aspect ratio, my screen is 1.85:1 wink.gif 10' diagonal... 5' tall, 126" diagonal including the black border. The back wall there is about 25', so lots of room for the monster subs wink.gif

Each sub stack is about 4' wide and 8' tall lol.

I caught the different aspect ratio, but it's not like that made much difference lol. That room is hoooge compared to mine.

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post #116 of 512 Old 02-20-2014, 11:23 AM
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Very interesting!

Thanks; yes, I'm a mechanical engineer who thinks about things like this a lot and it's taken 20 yr for this to reach full clarity.

Noah
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post #117 of 512 Old 02-20-2014, 12:51 PM
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Ok I see some serious problems here! There is too much empty space above your speakers so it is time to add a few things.

LF damping / absorption

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post #118 of 512 Old 02-20-2014, 01:44 PM
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Quote:
Originally Posted by notnyt View Post

Different aspect ratio, my screen is 1.85:1 wink.gif 10' diagonal... 5' tall, 126" diagonal including the black border. The back wall there is about 25', so lots of room for the monster subs wink.gif

Each sub stack is about 4' wide and 8' tall lol.

More perspective on Not's screen. Mine is 124 inches diagonal (not including border) with masking panels in. The screen is much larger with the panels out for 2:35:1 158 inches diagonal. However, this recent pic shows the 124 inch size - very similar to Not. Those are 18 inch subs and in the first picture you see one of the massive Danley SH50 speakers. Looking at Not's pictures it's hard to believe his screen is the same size. It really shows how crazy big his cabinets are. cool.gif



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post #119 of 512 Old 02-20-2014, 03:49 PM
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did you splurge on the danley's or were they loaners?

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post #120 of 512 Old 02-20-2014, 03:57 PM
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did you splurge on the danley's or were they loaners?


Sorry, I should have specified. These are Brandon's (beastaudio). He bought them used from a guy close to me in KC and let me check them out for a few days before shipping them out to him. VERY cool of him.

Details here:

http://www.avsforum.com/t/1512849/january-18th-loudspeaker-gtg-results-thread/390#post_24274144



and here:

http://www.avsforum.com/t/1512849/january-18th-loudspeaker-gtg-results-thread/390#post_24274144





and other posts in that thread. smile.gif
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