[Glady86]

I got stuff all over the place, sometimes I rearrange it and see how I like it. This is my most recent experiment.
 Next I need to paint the floor. 

 The diffusers do nice things, IMO.


 This is my man cave, ladies think I’m nuts and it’s ugly, I don’t care though.

 Here’s the arrangement I settled on after a bit of experimenting. Moving the QRD panels behind the bass traps and alongside the GIK Polyfusers made a nice all around bump up in sound quality.
 I was working with what I have, so if this arrangement isn’t something GIK or a room acoustics specialist would recommend, so be it, it’s working. Also, I think those MIflex capacitors finally settled down.

[Glady86]

Sounds like a good plan, hope you can update the thread and let everyone know how it goes with the MR T treatments.

[Jaytor]

The problem with these is that they aren't very deep. You're not getting appreciable diffusion below about 1500Hz and hardly any diffusion below 500 Hz. Here's a useful chart showing the frequency range of different instruments. You really want diffusion an octave or so below what these diffusors provide, which means they need to be 2-3 times as deep to provide much diffusion of the fundamental.

This chart shows the fundamental frequency range, so the harmonics will be an octave or more higher. So these diffusors will provide some help, but not nearly as much as if they provide some diffusion of the fundamental frequencies.

[corndog71]

If you haven’t seen it, Ron of New Record Day posted a great video on diffusion.

https://youtu.be/iTgW2hZYn08?si=zMXHuoWmU1ZrejQc

The arrangement of QRD diffusers are important. 
https://youtu.be/iTgW2hZYn08?t=751&si=zMXHuoWmU1ZrejQc

[toocool4]

The deeper the wells the lower the frequency it will diffuse.
You need to find out from them as to what frequency does it go down to? Use the lowers frequency it goes down to, to calculate the distance you need to be a way from it for it to work.
You need to allow the diffused sound to fully form before it reaches your location, else it will not do it’s job. You need the formula λ = v/f
where λ = wavelength
v = speed of sound in air (343 m/s)
f = frequency  (Hz)
 
In this case you say the deepest well diffuses 443Hz
So v (343) \ f (443) = 0.7743 meters or 2.54 feet. I would also add 50% to the distance to be sure.
 
I would recommend only using 1 dimension diffusers on the front wall, never mix it for your situation.
 
I am using 1 dimension quadratic diffusers on my front and rear walls.
On the front wall I am using QD-11 which are 9½ inch deep, it goes down to about 350Hz

On the back wall I am using QD 7 which are about4½
I calculated the distance from me before having them made, needed to know it’s going to work before spending money.

[Tyson]

toocool, your room looks great!

[toocool4]

Thanks Tyson, ideally I would have liked to do floor to ceiling on both front and rear walls. As you can see on my front wall the left and right side are different, I would not be able to treat both sides the same.
Since the middle makes more difference to the central image and I could treat it the same so I treated the middle of the front wall. What a huge difference it made, I have a deeper wider image, the sound goes a lot wider than the speakers are apart. I can hear more subtle things which were masked before, I am hearing more into the mix.

I would have like to use deeper panels on the front, but that would mean they would hang well over the mantel piece and that would not look good. Did not have much choice about the back wall since I am only sitting about 4½ feet from it, anything deeper would be a waste of money as it would not work properly.

Still work in progress, I need to get proper absorbers for the first reflection points. I also need to do cloud cover, to minimise the floor to ceiling bounce.

[toocool4]

Jmimac351 the Amazon stuff is cheaper as they are using less wood, it would not go low enough.

Quadratic is what you need on the front wall of a listening room, it’s the most powerful of the diffusers as you can made them as deep as you like to cover lower frequencies.
Not sure why anyone would want a 2D panels on the front wall of a listening room, 1D is all you need as you only want it to diffuse in 1 direction. On the back is a different matter, but for me I would still stick to 1D on the back.

I am not so sure about the image you posted, forget what your eye see you need what is going to work. At the moment sounds like you are guessing, it’s a lot of money to spend on a guess. When I was in my flat before I moved to this new house. I guessed and bought GIK, got it way wrong the GIK stuff was not very effective. I will not be making that mistake again.

If you don’t want to spend too much money, you can do like I did. I bought build plans from Acoustic Fields and make my own, Acoustic Fields are silly money, but they work. Here is a link to Acoustic Fields site. www.acousticfields.com/

[HAL]

Have been using various PI Audio Group styrofoam style diffusor panels for years.  The Mr T's and 2D panel styles.

Even built two portable 4ft x 6ft walls with them for shows.

[toocool4]

I don’t have the technical knowledge to explain to you why 1D quadratic is better for you on your front wall, you need to do some research on the internet. Or you can just stick to your design.

Talking about distance from the panels, I mean distance from the panels to your listening position not distance to anything else. The design you have chosen in the image you posted needs distance too.

[Danny Richie]

FYI, we have some really nice diffusors being made right now and will be launching them in 2025. Prices will be great, and dollar for dollar the best option out there. Pictures and stuff will be coming soon too.

[TRADERXFAN]

Nice. Great news...

- def deserves a new thread/announcement there

[Danny Richie]

Nice. Great news...

- def deserves a new thread/announcement there

When we actually take delivery then we'll post something.

This is a bunch of CNC, hotwire cut foam, similar to what you see in HAL's picture.

The real cost in having this stuff made is the shipping cost. Having the foam sent to where it is cut isn't about the material cost only, but getting it there. Then having it shipped from there to here is another huge cost. Then shipping from here to you.... It really adds up.

This stuff ships by dimensional weight and not actual weight. So a truck load is s truck load even if it's light.

We found a company that makes the foam near where it is cut (in Dallas). I am then driving down with a huge enclosed trailer and picking it up. So the only significant shipping cost is sending it out to the customers.  

The shipping costs savings is really helping to keep the cost down.

[TRADERXFAN]

Need a hub model with production in the high pop centers...

[VinceT]

FYI, we have some really nice diffusors being made right now and will be launching them in 2025. Prices will be great, and dollar for dollar the best option out there. Pictures and stuff will be coming soon too.

Great news, there is a need for a completivley priced product to disrupt this sector of the audio market. Trucking costs are low this time of year, rates are super cheap right now.

[AllanS]

Well, I ordered a couple boxes of this stuff and it showed up yesterday:

PI Audio ABB1 Mr. 'T' Hemispherical Radiation:  47.5" X 23.5" X 6" - Perfect for open baffle use: Unpainted / Box of 2 pairs (M & F)

Given a similar setup and for the same reasons, I have something very similar in mind if/when I decide to take one last shot at treatments.  If they actually provide audible improvements I’d be tempted to frame and cover them similar to the GIK 242 you can barely see on the RH side wall.
Unfortunately the Guilford of Maine fabric is no longer available so I’d have to repurpose some of the other traps.   

[corndog71]

ATS Acoustics sells that fabric.

[BGA]

I've used this fabric a lot in my theatre as the back is flat black with no shine. I like the look of it better than regular grill fabric. I covered my GIK scatter plates with it and it looks nice on the wall.

https://www.rosebrand.com/product800/102-Black-Speaker-Cloth-FR.aspx?tid=2&info=speaker

Al

[g3rain1]

One of the advantages of OB bass is it eliminates 1 room mode (side to side). 

Really? Because I have a gigantic hole at 43Hz which exactly correlates to my room width and won't go away no matter how I position my speakers and subs. All OB.

[corndog71]

Really? Because I have a gigantic hole at 43Hz which exactly correlates to my room width and won't go away no matter how I position my speakers and subs. All OB.

Bass traps might help.