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-   -   DIY construction methods of hang-able acoustic panels & moveable Corner traps (not fixed frames) (https://www.avsforum.com/forum/19-dedicated-theater-design-construction/1312693-diy-construction-methods-hang-able-acoustic-panels-moveable-corner-traps-not-fixed-frames.html)

mtbdudex 02-26-2015 09:04 AM

^^^ ok - 1st row.
measure and post your ETC, then build the first row ceiling cloud, install it, measure, subjective listen.
>>How does your soundstage/imaging sound now?

toofast68 02-26-2015 09:13 AM

Quote:

Originally Posted by mtbdudex (Post 32139825)
^^^ ok - 1st row.
measure and post your ETC, then build the first row ceiling cloud, install it, measure, subjective listen.
>>How does your soundstage/imaging sound now?

Soundstage and imaging sound really good to my "untrained" ears.


Only question I have left, is SHOULD I make the 1st row cloud larger than 2' - since it looks like the 1st ceiling reelection is RIGHT at 2'. Will making it bigger help with the sound NOT BOUNCING off the edges of the wood frame ?


Would going 2 1/2 foot wide cause any negative effects ?

mtbdudex 02-26-2015 09:33 AM

2' was/is a "nice" size simply because sheets came in 2' x 4' size, it worked for me.
If you need 2.5 ft wide than do that, I remember reading in one of these hundereds of threads that while people have touted the advantages of having the sides of acoustic panels "open" to catch specular reflections, the testing has shown it's really neutral, ie, both framed sides and opened sides performed similar enough in real world. So, don't sweat it too much....
(either Ethan W site or at Gearslutz, I can't recall)

toofast68 02-26-2015 10:11 AM

Quote:

Originally Posted by mtbdudex (Post 32140761)
2' was/is a "nice" size simply because sheets came in 2' x 4' size, it worked for me.
If you need 2.5 ft wide than do that, I remember reading in one of these hundereds of threads that while people have touted the advantages of having the sides of acoustic panels "open" to catch specular reflections, the testing has shown it's really neutral, ie, both framed sides and opened sides performed similar enough in real world. So, don't sweat it too much....
(either Ethan W site or at Gearslutz, I can't recall)

Cool...yeah my stuff is 16" wide, so I am going length dimension and cutting.


Oh, I did have one more questions (sorry I have two threads that are similar, but I am trying to focus this on the building of the cloud vs. 1st reflection)...but I will ask here if that is ok.


Do you (or anybody) have any idea what tilting UP the center channel has on 1st reflection on ceiling. The software most likely does not account for that, and I know testing would, but I have no way of holding my entire cloud at that height to test.


My gut tells me it MUST move 1st ceiling reflection closer to the front ??

mtbdudex 02-26-2015 01:05 PM

DIY construction methods of hang-able acoustic panels & moveable Corner traps...
 
^^^acousticians give sound fancy names, like modal waves and spectular Rays. I'll simplify, mathematically sound below what's called Fs, the translation frequency behaves like a sine wave, and wave theory can be used for its modeling and visualization. Sound above Fs behaves like spectular Rays, that is fancy way of saying like many straight lines starting from the same source and leaving it into 3D space. Fs is typically 250hz or so in common small room sizes.
What that means from your case of pointing the center channel upward vs straight? That means the reflected angle analysis is correct, but the strength of those reflections may be more because most speakers are strongest on axis and have some db fall off pattern off axis. Some speaker companies publish this info. It won't affect placement of your acoustic cloud, well technically maybe a nudge more foreword but starting with the Ray tracing as baseline is a good start. Best is having measurement mic to exactly place it.


Via Mikes brain/thumb interface, LLAP

toofast68 03-15-2015 04:36 PM

Yeah, finished by rear traps, 3.5 " Roxul Mineral Wool plus 3" air gap. Looks great too and it helps a ton...it really cut down on the echoes coming off the "close" ceiling in the back wall
Cloud is finished as well, just have to hang it and take pics.
http://i1172.photobucket.com/albums/...psvzofhkgx.jpg

mtbdudex 02-15-2016 09:53 AM

Been a while since I've posted here.
I've added a big 4 foot wide solid core door, that changed the balance of acoustics in the HT, so finally over past few weeks I've made a frame and nearly complete...

Hi tech sketch - grid paper
https://lh3.googleusercontent.com/-8...2_17_59_56.jpg

Inside view .................................................. ..... Outside view
https://lh3.googleusercontent.com/-P...2_17_59_49.jpg . https://lh3.googleusercontent.com/-b...2_17_59_46.jpg

Inside view .................................................. ..... Outside view
Frame hung up without OC703 to confirm all "ok" with swing clearance, hand to know clearance, etc
https://lh3.googleusercontent.com/-P...2_17_59_34.jpg . https://lh3.googleusercontent.com/-F...2_17_59_43.jpg

2" air gap with 2" OC703 ................................ .... detail of router inside 1 x 4 pine to "hold" the 2" OC703
https://lh3.googleusercontent.com/-8...2_17_59_39.jpg . https://lh3.googleusercontent.com/-d...2_17_59_20.jpg

Temp hanging, as I'm going to do the spoonflower AT cover here, with Nick's help
https://lh3.googleusercontent.com/-q...4_19_36_39.jpg . https://lh3.googleusercontent.com/-4...4_19_36_42.jpg

This image I took Jul 14, 2015 I'd like to have as AT cover.
https://lh3.googleusercontent.com/-a...on%2525202.jpg

Mfusick 02-16-2016 08:44 AM

Mike what speakers are you using?

Did you take any side wall reflection measurements?

mtbdudex 02-17-2016 08:34 AM

Took measurements years ago, then no door so RH side went thru curtains.
Now since added the door Reflections same as left side due to symmetry - can't change physics , so this was on my bucket list


Via Mikes brain/thumb interface, LLAP

Mfusick 02-17-2016 08:43 AM

I have not totally followed this thread but wondering where you stand on the good vs bad reflections thing, and the reflect/diffuse versus absorb argument.

I know you talk with Ethan a lot on FB, and he is a big proponent of absorption at the first reflection, and at generally making the room more dead. But I also know you value Toole, his book, and the work he's done showing that some reflections are good and add spaciousness and envelopement and a wider sound stage. Just wondering where you fall with that, and what experiences you've had with it? Have you changed your treatment strategy over time because of it? And- did you new speakers change anything from the old ones? (or did you not get them up and running yet?)

1Myke 10-05-2017 06:50 PM

Don’t know if anyone follows this thread but when the insulation was wrapped how did you work out the bumps that push against the speaker fabric?

I’m using roxul 3” safe and sound and it has small pieces that are visibly pushing on the speaker fabric. Trying to make it look smooth, obviously. Was thinking of wrapping the face of the frame in screen then speaker fabric? Any suggestions?


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