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Acoustical advice

post #1 of 10
Thread Starter 
Need some advice.
I have 24X16 room.
2 inches oc703 on the front wall.
2 inches of oc 703 (on the front 12 feet) of the side walls floor to ceiling. Back 12 feet alternating with 2 inches oc 703 and dry wall.
Back wall 4 inches cotton with plastic sheeting facing the room.
18x18 inches soffits around the room filled with insulation with paper facing into the room.
Front corner bass traps floor to ceiling.
Riser filled with insulation and stage with sand.
Bass sounds awesome. Other than that room sounds some what dead.
What can i do to make it more livlier?
I have seen every theater build in here uses only 1' oc703 on the side walls.
Do you think i have done too much by using 2' on the side walls?
post #2 of 10
Thanks for moving this to the public forum.

Without seeing your room, and where the speakers and seating are located, it's impossible to tell if you have absorption at the correct places. Generally, you don't need to cover that much wall surface to avoid early reflections, which occur at specific places:

How to set up a room
Early Reflections

As for 1" versus 2" thick (you did mean inches, yes?), thicker is always better. Material that's only 1" thick doesn't absorb to a low enough frequency. You'll probably also benefit from more bass trapping. The only way to know what you have now for sure is to measure using suitable software:

Room Measuring Primer

Then you can see the response, ringing, individual reflections, and also RT60 versus frequency.

--Ethan
post #3 of 10
Thread Starter 
Thanks Ethan,
Room is 24x16 and 10ft high.
Fixed 147" scope screen.
Tower speakers on sides of screen and center channel below the screen.
Front 12' of the side walls have 2" floor to ceiling and back 12 feet has alternating 2 foot panel (floor to ceiling) and dry wall.
Everybody on this forum uses 1" treatment only up to ear level. I think I messed up. Back wall"s 4" treatmaent does have plastic sheeting covering.
Thanks for your kind advice.
post #4 of 10
Quote:
Originally Posted by HSINGH View Post

Everybody on this forum uses 1" treatment only up to ear level.

I assure you that "everyone" on this forum does not do that! Here's another article I should have linked to previously:

Acoustic Basics

--Ethan
post #5 of 10
Thread Starter 
Thanks Ethan.
In my situation what can i do to improve the mids and highs. Thanks.
post #6 of 10
Quote:
Originally Posted by HSINGH View Post

In my situation what can i do to improve the mids and highs. Thanks.

Read the articles I linked! biggrin.gif

Seriously, none of those articles are very long, and they show exactly what to do.

--Ethan
post #7 of 10
Quote:
Originally Posted by HSINGH View Post

Thanks Ethan.
In my situation what can i do to improve the mids and highs. Thanks.

Hire Ethan!
post #8 of 10
Quote:
Originally Posted by HSINGH View Post

Need some advice.
I have 24X16 room.
2 inches oc703 on the front wall.
2 inches of oc 703 (on the front 12 feet) of the side walls floor to ceiling. Back 12 feet alternating with 2 inches oc 703 and dry wall.
Back wall 4 inches cotton with plastic sheeting facing the room.
18x18 inches soffits around the room filled with insulation with paper facing into the room.
Front corner bass traps floor to ceiling.
Riser filled with insulation and stage with sand.
Bass sounds awesome. Other than that room sounds some what dead.
What can i do to make it more livlier?
I have seen every theater build in here uses only 1' oc703 on the side walls.
Do you think i have done too much by using 2' on the side walls?

Even thin absorbing material absorbs highs, so making it thicker does not change the highs very much. The benefit of thicker material is better absorption of low frequencies.

It is possible that you have overdone the absorbing material. If the highs are too muted, try breaking up the large stretches of absorbing materials with objects that diffuse or reflect.

Good room acoustics is about balancing absorption, diffusion and reflection.
post #9 of 10
Dear OP

Without ETC, FR & Waterfall measurements, you really are asking us to guess at it all. If you dont want to invest the time and money in a quality measurement system, I understand completely. But you need to understand that without such data, its not really going to be possible to maximize the sound in your room. If you do, then ive explained how.
post #10 of 10
Quote:
Originally Posted by jim19611961 View Post

Dear OP

Without ETC, FR & Waterfall measurements, you really are asking us to guess at it all. If you dont want to invest the time and money in a quality measurement system, I understand completely. But you need to understand that without such data, its not really going to be possible to maximize the sound in your room. If you do, then ive explained how.

+1
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