Will dual Full Marty's move an AT screen?? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 13 Old 04-25-2018, 08:29 AM - Thread Starter
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Will dual Full Marty's move an AT screen??

Pretty straight forward question. I've got the theater room framed in with a platform to raise the speakers up and also double as a decorative "stage" in front of the false wall. With the Full Marty's sitting on the stage the ports will be lower than the bottom of the screen. I'm assuming the majority of the "wind" coming from the Full Marty's comes out of the ports and less from the woofer excursion. I found a picture very similar to what I'm trying to describe. Also included a picture of the framing. Do you guys think it'll be OK setup like this and not move the screen when bass hits?
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post #2 of 13 Old 04-25-2018, 08:48 AM
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Will dual Full Marty's move an AT screen??

Quote:
Originally Posted by Gameaholic View Post
Pretty straight forward question. I've got the theater room framed in with a platform to raise the speakers up and also double as a decorative "stage" in front of the false wall. With the Full Marty's sitting on the stage the ports will be lower than the bottom of the screen. I'm assuming the majority of the "wind" coming from the Full Marty's comes out of the ports and less from the woofer excursion. I found a picture very similar to what I'm trying to describe. Also included a picture of the framing. Do you guys think it'll be OK setup like this and not move the screen when bass hits?


Well, look at my avatar and you’ll see what I’m pointing at my screen. At low fq’s the screen ripples and moves a lot. Very noticeable with the lights on with music or movie clips. That said, I cannot ever see the screen move during movies. My eyes cannot detect the 1/4 inch the screen fabric actually moves. All I see is the image.

Last edited by Jk7.2; 04-25-2018 at 08:56 AM.
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post #3 of 13 Old 04-25-2018, 08:48 AM
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It will probably move the screen. Then again, it will probably move the screen wherever they are placed. It isn't as much of an issue (IMO) as you may think though. @eng-399 has 4 ported 21's behind his screen, which of course really moves it when the bass hits. It almost adds something when everything goes blurry on those big hits. My brother in law has two full Marty's and they shake his screen and his projector with the same effect. Just my experience, yes it will, but no its not a big deal.

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post #4 of 13 Old 04-25-2018, 09:39 AM - Thread Starter
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Quote:
Originally Posted by Jk7.2 View Post
Well, look at my avatar and you’ll see what I’m pointing at my screen. At low fq’s the screen ripples and moves a lot. Very noticeable with the lights on with music or movie clips. That said, I cannot ever see the screen move during movies. My eyes cannot detect the 1/4 inch the screen fabric actually moves. All I see is the image.
That's a crazy amount of giant subs!!!!! I'm not looking to go quite that big. Setup behind the screen will be HTM-12 --- Full Marty (UM18-22 18") --- HTM-12 ---- Full Marty (UM18-22 18") --- HTM-12. Guess I'll hope for the best. Room is 12' wide and a total of 33' long. Any logic or benefit to build Cubes over Fulls? I've got plenty of room for either or.
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post #5 of 13 Old 04-25-2018, 09:40 AM
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Quote:
Originally Posted by Gameaholic View Post
That's a crazy amount of giant subs!!!!! I'm not looking to go quite that big. Setup behind the screen will be HTM-12 --- Full Marty (UM18-22 18") --- HTM-12 ---- Full Marty (UM18-22 18") --- HTM-12. Guess I'll hope for the best. Room is 12' wide and a total of 33' long. Any logic or benefit to build Cubes over Fulls? I've got plenty of room for either or.


Build the largest cab you can for lower tune. That’s what I’d do anyway.
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post #6 of 13 Old 04-25-2018, 10:57 AM
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post #7 of 13 Old 04-25-2018, 12:40 PM
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Have the ports leave the side of the box or have your screen higher than where the port are on the box and you should be good. Having a lot of subs shakes my screen pretty bad but only when turned up high like past -10 besides that it doesn’t move to much.
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post #8 of 13 Old 04-25-2018, 12:43 PM - Thread Starter
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OK...I'll make sure the vents are under the screen. Thanks!
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post #9 of 13 Old 04-25-2018, 04:38 PM
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Quote:
Originally Posted by Jk7.2 View Post
Well, look at my avatar and you’ll see what I’m pointing at my screen. At low fq’s the screen ripples and moves a lot. Very noticeable with the lights on with music or movie clips. That said, I cannot ever see the screen move during movies. My eyes cannot detect the 1/4 inch the screen fabric actually moves. All I see is the image.
Pffft, that means you need MOAR!
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post #10 of 13 Old 04-25-2018, 06:21 PM
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IMO, the screen moving is nothing compared to feeling the liquid in your eyeballs vibrate, and a type of suction pulling air out of your lungs. Not saying it's a bad thing....

YMMV, of course
Joseph

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post #11 of 13 Old 04-25-2018, 06:34 PM
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Drivers don't create wind, so any wind will be 100% port.
Port's have the highest velocity near the tuning.

My screen shakes and blurs and I don't have anything behind mine, and mine is anchored to trusses and concrete (6inch screws and concrete nails), and my subs are mostly all sealed and the drivers are far from the screen too.
It's impossible to stop when the whole room is flexing. (Flexing 3 layers on each side, with the green-glue added.)
and now I've added another 13 subs since then... hehe!
My projector is also anchored to the trusses directly with more 6inch screws, and it still doesn't help...
[The goggles... they do nothing!] LOL

Here is an old vid showing what 8 of my subs and 25kW does:
That was when I just had B&W's, that's not even the DIY speakers or HzHorn or none of that beefier/louder stuff...

I will soon have 29 subs and 50-100kW up and running here.
(Yes I know... hurry up! )

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post #12 of 13 Old 04-25-2018, 06:43 PM
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Quote:
Originally Posted by BassThatHz View Post
Drivers don't create wind, so any wind will be 100% port.
Port's have the highest velocity near the tuning.

My screen shakes and blurs and I don't have anything behind mine, and mine is anchored to trusses and concrete (6inch screws and concrete nails), and my subs are mostly all sealed and the drivers are far from the screen too.
It's impossible to stop when the whole room is flexing. (Flexing 3 layers on each side, with the green-glue added.)
and now I've added another 13 subs since then... hehe!
My projector is also anchored to the trusses directly with more 6inch screws, and it still doesn't help...
[The goggles... they do nothing!] LOL

Here is an old vid showing what 8 of my subs and 25kW does:
https://www.youtube.com/watch?v=Kh6f2rDjL7g
That was when I just had B&W's, that's not even the DIY speakers or HzHorn or none of that beefier/louder stuff...

I will soon have 29 subs and 50-100kW up and running here.
(Yes I know... hurry up! )
You have issues.
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post #13 of 13 Old 04-25-2018, 06:52 PM
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Quote:
Originally Posted by Doradoguy View Post
You have issues.


Only that his screen shakes. That’s the only issue
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