Custom DIY diffuser panels...

So I posted an update on the differences... I won't dupe them here, but you can see the ETC graph comparisons here:

MartinLogan Renaissance 15A Speaker Measurements and Room Influence

I may do more later... it's quite the task building them. I could do another set for the side corner, but I'm not sure it would be worth it. Everything I do is for two-channel. I'm not all that concerned with movies at this point... never have been outside of doing Dirac Live.
www.avnirvana.com www.avnirvana.com

I'll admit... I did not have my initial ETC and Impulse graphs set properly... I don't think. There appears to be more of a difference than I originally thought... I think... maybe... perhaps.
 
Here are the custom absorption panels I built this afternoon... 91" tall x 44" wide x 7.25" deep... with the heavy Roxul R30 insulation.

42046


42047
 
Looks very well made! Can't wait to see a before and after REW analysis.
BTW: I don't like you any more :( You are an Alabama fan :( My son went to Auburn.
Just kidding :)
 
pratul said:
BTW: Are you going to cover the back side of the panel to stop fibers from falling out?
Click to expand...
Probably not... if I leave them there, shouldn't much fall out, if any. The good thing is it's not fiberglass. When moving them into the room and bouncing them around, nothing fell out that I could tell.
 
ML15A_ETC_Diffusion.png


ML15A_ETC_Absorption.png
 
Very interesting... 7.5 dBFS difference... Diffusion is a little wild and crazy... Absorption a little more reserved...

Which one sounds better to your ears?
 
Really hard to say at this point. I can't auto switch them, so it's somewhat difficult for me to say one is better than the other... they both sound good. Both image well and have that big sound stage.
 
I know... Sometimes we can't tell a difference even when REW shows you the difference... And sometime we can hear a difference even though REW can't show us the difference...

Have you tired both??? The absorber over the diffuser??? That might prove interesting too...

By the way... What amplifiers are you running now??? :coocoo:
 
Last edited:
The absorption panel is covering the diffusor right now.
 
I working on a measurement system now... maybe once I get that done I can do some objective reviews of amps, and my personal opinion of them.
 
I was looking for Arqens build plan on this type of diffuser the other day and it's disappeared off the net. Do you have specifics? Just a basic outline on each depth and height? What program did you use to design it?

Secondly, do you have any reason to place them behind your speakers. Would the diffuser receive either reflections or direct sound at that point?
 
Trdat said:
I was looking for Arqens build plan on this type of diffuser the other day and it's disappeared off the net. Do you have specifics? Just a basic outline on each depth and height? What program did you use to design it?

Secondly, do you have any reason to place them behind your speakers. Would the diffuser receive either reflections or direct sound at that point?
Click to expand...
Yes... the first post as the measurements to use. I used 1x4's and plywood as described earlier. There was no program to design it... it was already designed... see first post in this thread.

I placed them behind the speaker because I have dipole electrostatic MartinLogan speakers that produce direct sound towards the rear. However, I prefer the absorption panels (again, shown in this thread) over the diffusion panels in my room.
 
Sonnie said:
Yes... the first post as the measurements to use. I used 1x4's and plywood as described earlier. There was no program to design it... it was already designed... see first post in this thread.

I placed them behind the speaker because I have dipole electrostatic MartinLogan speakers that produce direct sound towards the rear. However, I prefer the absorption panels (again, shown in this thread) over the diffusion panels in my room.
Click to expand...

Apologise, yes on your initial post has a pretty detailed layout of the build thanks.

I don't know much about the Martin Logan's wasn't aware they radiate backwards, now that I know it makes sense. Very interesting about you preferring the absorption perhaps your room is very small? Do you know the average time gap from the speaker to the diffuser then back to the listening position?
 
ddude003 said:
Ask Tim Perry on his Arqen web site http://arqen.com/wp-content/docs/diffusers/Diffuser-A1LF-Fab-Drawings-Arqen.pdf or Search for Tim Perry's thesis... https://fdocuments.in/reader/full/acoustic-diffuser-optimization-arqen-copy

Google is your frenemy...
Click to expand...

Thanks so much for the link.

The plans do not exist anymore, It seems he doesn't send them through like he did before, I tried hard hunting them down. I have the fractal plan but not the stepped diffuser so appreciate it you sending them through.
 
Trdat said:
Apologise, yes on your initial post has a pretty detailed layout of the build thanks.

I don't know much about the Martin Logan's wasn't aware they radiate backwards, now that I know it makes sense. Very interesting about you preferring the absorption perhaps your room is very small? Do you know the average time gap from the speaker to the diffuser then back to the listening position?
Click to expand...
No problem at all.... and check out this thread with impulse and ETC measurements between absorption and diffusion... posts 32-33 ... https://www.avnirvana.com/threads/m...speaker-measurements-and-room-influence.8391/

My room is 19.5ft wide x 23.5ft deep and about 8.5ft high.

I've read in various places that absorption will generally give tighter and more focused imaging, but perhaps diffusion gives you a larger soundstage. I don't think diffusion really helps in my setup because the huge size of the 15A's produce an enormous soundstage even with absorption, but it also improves the imaging.
 
Sonnie said:
No problem at all.... and check out this thread with impulse and ETC measurements between absorption and diffusion... posts 32-33 ... https://www.avnirvana.com/threads/m...speaker-measurements-and-room-influence.8391/

My room is 19.5ft wide x 23.5ft deep and about 8.5ft high.

I've read in various places that absorption will generally give tighter and more focused imaging, but perhaps diffusion gives you a larger soundstage. I don't think diffusion really helps in my setup because the huge size of the 15A's produce an enormous soundstage even with absorption, but it also improves the imaging.
Click to expand...

You could place diffusion in such a way that secondary reflections get to it and get back to listening position. My next goal is to learn how to do this, it still should work in a small room.

One quick question, would particle board with the typical laminate cover(kitchen bench top material) work for the stepped diffusor? I know solid wood is best but the ease to cut kitchen chipwood or MDF at a factory would help a lot with my build and the overall look. I am presuming the laminated layer would be reflective enough. Does anyone have any idea if it's a wrong move or should work fine?
 
I don't think the material would matter that much as long as it is reflective.
 
MDF would be fine @Trdat . Even particle/furniture board should be OK provided that the exposed cut faces of the lumber weren't too rough or full of air cavities.
 
You must log in or register to reply here.

Popular tags

20th century fox 4k blu-ray 4k uhd 4k ultrahd action adventure animated animation bass blu-ray calibration comedy comics denon dirac dirac live disney dolby atmos drama fantasy hdmi 2.1 home theater horror kaleidescape klipsch lionsgate marantz movies onkyo paramount pioneer rew romance sci-fi scream factory shout factory sony stormaudio subwoofer svs terror thriller uhd ultrahd ultrahd 4k universal value electronics warner warner brothers well go usa
Back
Top