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#413801 - 07/29/15 09:43 PM Re: Lets plan a theater space [Re: Gr8_White_North]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7786
Loc: Canada
Its starting to look like a theater now. This is the part of a project where my patience runs out.
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#413957 - 08/06/15 04:43 AM Re: Lets plan a theater space [Re: AAAA]
AAAA Offline
connoisseur

Registered: 03/28/14
Posts: 1593
The sectional is here. It fits the room nicely and is comfortable.

From bare room to sectional the sound got "better" but now there is a distinct "boing" to the handclap echo in the front of the room, and my voice sounds wierd as I walk and talk to someone in the mlp. Doh! Must investigate further. Thought for a minute the nice response curve would persist once the room was furnished a bit....

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#413958 - 08/06/15 06:02 AM Re: Lets plan a theater space [Re: AAAA]
Mojo Offline
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Registered: 01/21/07
Posts: 6336
I bet you wish you had your sound panels. Take comfort in the fact they've made a huge difference in my new room =).
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#413965 - 08/06/15 05:12 PM Re: Lets plan a theater space [Re: Mojo]
AAAA Offline
connoisseur

Registered: 03/28/14
Posts: 1593
Originally Posted By Mojo
I bet you wish you had your sound panels. Take comfort in the fact they've made a huge difference in my new room =).


Lol. Very good news... For you! smile

I'll have to whip some up. But gosh its hard when the sun is shining.

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#413999 - 08/09/15 07:37 PM Re: Lets plan a theater space [Re: AAAA]
AAAA Offline
connoisseur

Registered: 03/28/14
Posts: 1593
Well, at the spurring of Mojo, bass traps are now in front corners. grin Floor to ceiling 1' wide on the diagonal. They are 90" tall 3" deep 5/8" frames of MDF, lined with roxul and 6mil Poly wrapped on one side (facing into room) to help reject high frequencies. This room needs bass absorbtion while leaving energy in higher frequencies.

With couch and bass traps the overall rt60 is 0.41 seconds (down from 0.61 bare) In real world terms, this means there is better definition in bass and percussion and no noticable ringing or "boing" anymore. The room is starting to sound like it is under some control. The longest decaying octave is still the lowest. But the critical midrange 250hz to 4khz is all very well behaved spanning 0.42-0.45 seconds. I still need to bring it down a bit. I'm thinking I may not need first and second reflection broadband absorbtion. I may turn the second reflection points into poly faced traps to limit high frequency absorbtion. The first reflections will still get broadband traps.

After the traps were installed and some testing and demos, we watched Pacific Rim at reference........ Yeah... So..... More treatment needed. Lol. What a bass heavy gongshow that movie is. Grin fest. My ears hurt. Reference is too loud. But when an actor shouts, its like they are shouting at realistic levels. Kinda neat, but not an everyday thing for me.

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#414002 - 08/09/15 08:59 PM Re: Lets plan a theater space [Re: AAAA]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7786
Loc: Canada
According to a fancy reference book I own (have not looked at it in three or four years) RT60 is only relevant for very large commercial spaces. I don't remember the details any more though.

Either way, if the traps are working for you, that's good.
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#414004 - 08/10/15 04:44 AM Re: Lets plan a theater space [Re: AAAA]
AAAA Offline
connoisseur

Registered: 03/28/14
Posts: 1593
Hey Fred, thanks for the heads up. Old habit to call it RT60.

In small rooms were supposed to refer to this metric as simply T60 as there is no reverb in household dimension rooms. You are right. I found this out from a white paper I read recently to brush up on what I need to do to establish a target of performance. This is where I came up with the "goals."

http://www.acousticfrontiers.com/wp-content/uploads/2011/10/acoustic_measurement_standards.pdf

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#414010 - 08/10/15 07:45 PM Re: Lets plan a theater space [Re: AAAA]
nickbuol Offline
axiomite

Registered: 09/16/04
Posts: 5371
Loc: Marion, IA
Only 1 foot wide bass traps? Some of the acoustical crazies would say that isn't a bass trap, but a mid-bass trap, but if it works, then cool

I have the luxury of having mine hidden, so they are bigger.

I think that it was the right choice acoustically to treat the front side corners as they tend to be the most problematic with bass wave amplification (and muddying).

Pictures?
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#414012 - 08/10/15 08:21 PM Re: Lets plan a theater space [Re: AAAA]
AAAA Offline
connoisseur

Registered: 03/28/14
Posts: 1593
Yeah... blush I only went 1 foot wide to use the bag of Roxul most efficiently. 8 Batts. 6 reserved for sidewall panels. 2 left. Decided to go tall and get the whole corner instead of wide and getting top or bottom. Time will tell if it was the right choice. Right now the measurements don't really show much of a difference below 200Hz. But somehow it does sound better. Maybe the corners becoming angles helped with something.... dunno.

I do plan on rear wall bass absorbtion hidden in the media shelving unit. A future adventure.

The screen finally arrived today!!! Now I have to decide on the speaker cloth for the fabric wall. Thoughts Nick? I'm leaning towards the Mellotone Fabric from Parts express. I like that it is super black and fire retardant.

Pics are in order I guess. Was too lazy on weekend.

Side facing into corner before fabric wrap.



The room from rear corner birds eye.



Front wall.



The following measurements were taken at 1/12 octave scale with the same volume setting on the AVR.

Bare Room



Sectional Added (notice high frequencies lowering and overall db decreases.)



Bass Traps added. Overall response valleys decreased in severity. Bass slightly flatter. Room Db slightly lower. The valley developing between 2-4Khz will be something to keep and eye on as the room is treated further. I dont want to lose energy there!! Bad!


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#414015 - 08/10/15 09:12 PM Re: Lets plan a theater space [Re: AAAA]
Gr8_White_North Offline
connoisseur

Registered: 07/12/09
Posts: 2281
Loc: Whitehorse YT
HEYY wait a seconddddddddddd,,,,,,,, where is your Axiom speakers. I thought you were an Axiomoe/ ite smile
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