Very cool findings!

I'm glad to see you're taking measurements!

Don't forget, you have many, many more corners you could try your box-o-absorption in...middle wall between speakers, back wall, ceiling corners if you feel adventurous. Have fun with it...since you're measuring, you may as well figure out what wall/intersection works best!

Thanks guys!

LR, I bought 5 boxes of 6x2" so I've tried a lot of positions. The front left was the most effective for a single box.

I'm slowly converting those boxes into panels.

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I built 8 so far, shooting to have another 8ish done next week. I estimate I'll need 14-18 2x4' panels to get the reverb to a good level. The lower frequencies I'm just going to have to live with for now.

Acoustic treatment is a tough sell until, you experience music in a treated room. It's all over after that, you become obsessed with it.

The cost per 25.25x49.5" panels are just under $30 each. that includes 703, fiberglass, staples, wood, wood glue, nails and acoustically transparent cloth.

tools used: chopsaw, drill, hammer, stapler, scissors, tape measure and pencil

I was thinking I would just not make any QRD Diffusers.... Well now I feel I have too!

The clarity is just going through the roof, it's so seductive right now! I'm only half way done with the absorbers.

Here is a room response with and without the panels. I did tweak the seating and speaker positions a little so, it's not 100% accurate representation of the effects.


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The reverb is coming way down too! was over 200ms is some areas now 90-130ms. shooting for 70-80ms

I hear you, getting some absorption on the ceiling is needed. In this location, I cannot screw or put holes in the ceiling. Any thoughts for a solution?

My first thought is to make a pergola type structure with 2x4's. doesn't seem feasible right now. It will be a lot of material and getting all the parts and assembled would be a PITA.

Hey Groove, do you have any pics of your finished work? Looks like you're doing a real nice job.

By the way, may I ask what led you to go with 2" thick/deep vs. 4" for absorption?

-Brad

It’s so cool to see the results of treatments on your graphs, especially since we can’t hear it for ourselves in this venue.  Thank you for documenting that!
What cloth are you using, and have you found one of the two to be better?

I used ATS acoustics burlap and Acoustimac DMD fabric. The ATS Burlap is better acoustically, DMD looks much better. I’m hesitant to say the DMD is truly acousticly transparent. 

DirtDawg, rereading my post, I see, I wasn’t very clear. I added 4 boxes of 6x 2” panels, meaning 12” deep of 703 fiberglass. 2” panels didn’t provide the difference in the two measurements. The first picture with the box that is 12” deep of 703. I also have more of those boxes in the room in addition to the 2” fabric covered panels. 

It was over a year ago, I’m giving myself the benefit that the only difference was the fiberglass in the room. Moving the listening position and the speakers is also a good way to even out the frequency response. Eventually, treatment is needed to correct room distortion.

I’m still surprised about the radical change shown on the measurements. If I saw someone else post this, I would be skeptical. I’m questioning my testing methods. What I’ve learned in the year and a half since I did that is, I should have run the sweep at a higher SPL. It would have been more telling at 80dB SPL vs. the 72-74 dB that I did when I ran the sweep. 99% of my listening is with peaks under 80dB. The pressure difference, between 74 and 80 dB SPL, is immensely more energy that needs to be managed. Meaning that the measurements may be misleading.

I am questioning the measurements. However, actual listening is immensely more engaging and, to me, that is more important than measurements and theory.

It might be doing more good than one would think.

I took the photo with it open to give more information. I taped them closed.

That sounds like a good plan for taking meaningful measurements. 10dB above loudest passages makes sense to me.

Ok, so I am sure that somebody is in the house and stops moving the second that I hit  pause.   Spooky.

 See? It isn't just me. Acoustics have always made the biggest impact by far, not even being in the same realm as some of the crap sold out there.
Ok, so I am first to admit, what I have done is not pretty. It can be undone in minutes, and now, I think that I will 'rediscover' another album.

I love it!

Once you hear it you cannot unhear it, that's the rub.

Covering the TV with good absorption is such an easy and highly effective move.

I have the same experience with poor quality recordings, they don't sound better however, they are more enjoyable to listen to.

"Turn out the lights, the party's over." Willie never sang so true. Last straw was tripping over acoustic treatments on floor level. It was fun folks, but I have started to hang my clothes where they belong. Comforters are being put back in plastic tubs, well, one of them anyway. I have to ween myself here.
 We now return to our regularly scheduled program, now in progress.