Help Design Front Sound Stage
Like Big said, yes two layers of 1” is better than one layer of 2” as long as use the 3-5 mil plastic.
A great thing you can do that RPG provides free to the public is look at the many ways of wall mounting their products with air gaps, no air gaps, and different thicknesses of absorption. They break down all the data from each mounting method and provide the graphs along with detailed section drawings.
Once one understands the different approaches it’s all relatively simple to comprehend the available options along with their intended uses.
You won’t have to really try to control SBIR with an 18” maximum front speaker baffle placement but screen reflection and general reflections are what you will be treating the front wall to combat. So treat it with as much absorption as you can afford would be my advice. If you aren’t planning on treating the rest of your room at the same time as your front wall which would in theory spare more money to invest into the products needed.
I don’t know what QuestAI is using for the front wall but IMO there really isn’t any need for anything other than absorption being that I don’t want to hear anything at all interfering with the screen. Some like diffusion but I just don’t get how that does anything for the frequencies that aren’t directional being that when they place diffusers there they aren’t sized appropriately for the omnidirectional waves that will hit them. The omnidirectional waves require far deeper or different design types of diffusers to break up those waves and scatter the waves.
Other sound waves bouncing around the room can and will return to the front wall at times which could be diffused but in HT rooms generally the other walls in the room will be treated so that those waves that might make it back to the front wall which could be scattered/diffused will be zapped elsewhere which eliminates the need for any other type of acoustic panel other than absorption.
If you just don’t care to research it like most who just don’t have the time then go with the broadest range of panel/fabric that you can afford at the time. Also, it used to be suggested that the speakers needed to be placed further away from the AT fabric than now is my understanding. From what I’ve gathered the benefits of placing the speakers closer to the fabric outweigh placing them further back. Again, in your situation this is a moot point but just thought would bring it up.
The thing is one never realizes what they are missing with properly treated front stages until it’s done so there aren’t tons of posts about it. I have experienced it twice in my own room and will experience it again as soon as the last of my subs arrive from Nick at SI and can finish my front wall yet again.
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