[Glady86]

Here’s a cheap tweak I just tried, I have a dip between 200 to 350hz. Sticking a thick carpet between the speakers that was just bare concrete helped. From what I understand, floor bounce reaction between woofers and floor can cause this. Plus the ceiling is not very high, though it’s insulated and have acoustic panels for the  drop ceiling.

[Glady86]

After reading more about floor bounce, apparently carpet does nothing to address it. And some say it’s not that detrimental to sound quality anyway. Although the extra carpet piece did change the sound, maybe the room was a little to “live” and the change added a little more “flesh” to the midrange. It’s crazy how much the room and what’s in it affects the sound.

[Tyson]

Room is the 2nd most important component, after speakers.

[jmimac351]

After reading more about floor bounce, apparently carpet does nothing to address it. And some say it’s not that detrimental to sound quality anyway. Although the extra carpet piece did change the sound, maybe the room was a little to “live” and the change added a little more “flesh” to the midrange. It’s crazy how much the room and what’s in it affects the sound.

Good idea.  I'll ask my wife to stand in different spots and see if it improves the sound.  If it does, I'll see if she can stand there while I want to listen.  Tomorrow will be 25 years, I bet she will... roll her eyes at me again.

Waiting to hear back about PIAudio foam treatments. I may try a few different things / looks. 

[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.

[jmimac351]

Thanks for sharing.  I'm in touch with Dave about the "Mr T" treatments, like what Danny has in his room.  I'm going to send Dave a video of the room so he can recommend what's best.

[Glady86]

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

[jmimac351]

I think I've figured out what I'm going to do and I think I've learned a few things.   

I think I already have a pretty good room.  Feedback from friends agrees.  I have tall ceilings and "no side walls".  I don't want the room to be any deader than it already is... I think I just need to see what happens with more diffusion on the front wall.  After I get OB subs, I will see how they like the room and whether I need to put some sort of absorption somewhere for bass.

I'll have wood diffusers on the front wall at the reflection points, then maybe foam diffusion of some sort that I can lightly hang on the TV, as needed.  I came across this place below on Amazon, but they are out of Colorado.  Quite a few different designs. 

I've noticed that quite a few others are doing the standard QRD diffuser design... i.e., horizontal diffusion, and not as much vertical. It's interesting to compare what they show for diffusion coefficient between the Triangle design and the Quadratic Residue Well. I would have guessed the Triangle design would scatter more than the "channel" design of the QRD Well design. Whatever the case, I wonder how big a difference exists when you actually listen to the variations.

https://www.soundassured.com/products/wood-acoustic-diffuser-wood-acoustic-diffusion-panel-60-x-60-cm?variant=41782131589278

[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.

[jmimac351]

Jay, thank you very much for pointing that out.  I went and looked again at the ATS stuff.  She likes this layout, and I'm going to order a pile of these ATS diffusers.  I may provide enough space in the middle to accommodate a projector screen that is framed in.  There are ultra short throw projectors out that are remarkable.  I considered making a nice acrylic stand that will be over the KX-R Twenty preamp in the middle, which I don't mind being protected from something stupid anyway. I can set the projector on that, and can then also put custom sized diffusion in that cavity in front of the screen that makes it look somewhat seamless, or at least planned for... if I feel like putting it in. 

I think that may be pretty slick.

https://www.atsacoustics.com/square-acoustic-diffuser-qrd.html

[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