Time for some science

[rvsixer]

EXCELLENT post. Thank you for the time put into this .

[davef]

EXCELLENT post. Thank you for the time put into this .

My pleasure, well worth the time in showing real-world results on the accuracy of those predicted (estimated) in-room response measurements. I knew they would be close, but I honestly didn't expect them to be *that* close. It was also time for me to refresh myself a bit on REW

[mikesiskav]

My pleasure, well worth the time in showing real-world results on the accuracy of those predicted (estimated) in-room response measurements. I knew they would be close, but I honestly didn't expect them to be *that* close. It was also time for me to refresh myself a bit on REW

Hi Dave, didn't you have some acoustic treatments on the right wall?

[diesel79]

And it’s things like this why I will only buy Ascend speakers. Honesty. You know exactly what your are getting. great info!

[davef]

Hi Dave, didn't you have some acoustic treatments on the right wall?

Yes, took them down to better mimic a typical room. We designed that room so that we can easily hang or remove the 4" thick acoustic foam panels.

I did also take measurements with them up, the differences were (surprisingly) very minimal and only in the very top end. I was too lazy to put them back up, but we have a demo tomorrow and another on Friday so I have to set the demo room back up.

Mike - I used a Surface Pro 7+ (windows 11) with REW and I was surprised at how well it worked. I have had some issues with REW on other laptops, but this combo worked really well.

[rvsixer]

Yes, took them down to better mimic a typical room. We designed that room so that we can easily hang or remove the 4" thick acoustic foam panels.

I did also take measurements with them up, the differences were (surprisingly) very minimal and only in the very top end. I was too lazy to put them back up, but we have a demo tomorrow and another on Friday so I have to set the demo room back up.

Yes with 4" panels it's expected mostly mids/highs will be affected. Broadband absorbers (6" min. and better at 8" +) will cover bass/mid/highs.
Space your 4" ones up to 4" off the wall creating an air gap, they will dig a little deeper (any further than this, and they start to become more reflective and less absorptive).

Info (not foam tested here, but same results/trends would come with foam of similar gas flow resistance):
https://jhbrandt.net/wp-content/uplo...Absorption.pdf
https://jhbrandt.net/wp-content/uplo...ffy-vs-703.pdf

[davef]

Yes with 4" panels it's expected mostly mids/highs will be affected. Broadband absorbers (6" min. and better at 8" +) will cover bass/mid/highs.
Space your 4" ones up to 4" off the wall creating an air gap, they will dig a little deeper (any further than this, and they start to become more reflective and less absorptive).

Info (not foam tested here, but same results/trends would come with foam of similar gas flow resistance):
https://jhbrandt.net/wp-content/uplo...Absorption.pdf
https://jhbrandt.net/wp-content/uplo...ffy-vs-703.pdf

rvsixer, not to sound condescending (that is not my intention) but we do no know a bit about about absorption. We are certainly not looking to absorb bass or even mids. Our panels were purposely built and installed by us to absorb slap echo in our demo room, as it was quite a lively room due to a very large section of glass on the opposite wall. Ultimate goal was to dramatically improve RT60, which it does, while *not* absorbing too much in the way of reflections so as to reduce actual spaciousness.

My previous comment regarding absorption was a positive one, I expected more high frequency absorption due to the panels compared to what we measured, which I was pleased about. It means the panels are doing exactly what our goal was for them

[rvsixer]

rvsixer, not to sound condescending (that is not my intention) but we do no know a bit about about absorption. We are certainly not looking to absorb bass or even mids. Our panels were purposely built and installed by us to absorb slap echo in our demo room, as it was quite a lively room due to a very large section of glass on the opposite wall. Ultimate goal was to dramatically improve RT60, which it does, while *not* absorbing too much in the way of reflections so as to reduce actual spaciousness.

My previous comment regarding absorption was a positive one, I expected more high frequency absorption due to the panels compared to what we measured, which I was pleased about. It means the panels are doing exactly what our goal was for them

My apologies, was not my intention to imply you didn't know about absorption, decay time improvement, etc.

I suppose I misinterpreted the 'surprisingly' minimal measurement differences you found between panels up and panels down, whereas in my own experience that would be the expected result of typical 4" foam panels. Great your customized panels/treatment met your goals.

Again, my apologies for the misinterpretation. Sometimes too easy to do over forums. Now on to measuring my own new room and getting ideas on the treatment needed; I am expecting RT60 times WAY up there as it's all tile floors, a big window on one side, etc.