Custom DIY diffuser panels...

Sonnie

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


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.
 

Sonnie

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JTR Neosis 110HT
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JTR Neosis 210RT
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JTR Neosis 110HT-SL
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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
 

pratul

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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

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Sonnie

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JTR Neosis 110HT
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JTR Neosis 210RT
Front Height Speakers
JTR Neosis 110HT-SL
Rear Height Speakers
JTR Neosis 110HT-SL
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BTW: Are you going to cover the back side of the panel to stop fibers from falling out?
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.
 

Sonnie

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Front Speakers
RTJ 410
Center Channel Speaker
MartinLogan Focus C-18
Front Wide Speakers
JTR Neosis 110HT
Surround Speakers
JTR Neosis 210RT
Surround Back Speakers
JTR Neosis 210RT
Front Height Speakers
JTR Neosis 110HT-SL
Rear Height Speakers
JTR Neosis 110HT-SL
Subwoofers
JTR Captivator 2400 x6
Other Speakers or Equipment
VTI Amp Stands for the Monoblocks
Video Display Device
Sony 98X90L
Remote Control
Universal MX-890
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FireCube for movies and Lenova Carbon X1 for Roon
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Lifetime Roon Subscription
Tidal
qobuz
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Dish Joey 4K
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Zero Surge 8R15W-1 | Salamander Synergy Equipment Stand

ddude003

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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?
 

Sonnie

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Center Channel Speaker
MartinLogan Focus C-18
Front Wide Speakers
JTR Neosis 110HT
Surround Speakers
JTR Neosis 210RT
Surround Back Speakers
JTR Neosis 210RT
Front Height Speakers
JTR Neosis 110HT-SL
Rear Height Speakers
JTR Neosis 110HT-SL
Subwoofers
JTR Captivator 2400 x6
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VTI Amp Stands for the Monoblocks
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Sony 98X90L
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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.
 

ddude003

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Sony UBP-X700 /M Ultra HD 4K HDR & PS5
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Martin Logan Motion C2
Surround Speakers
Martin Logan Motion 4
Surround Back Speakers
Martin Logan Motion 4 (yes, another set of these)
Subwoofers
Martin Logan Dynamo 700
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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:

Sonnie

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RTJ 410
Center Channel Speaker
MartinLogan Focus C-18
Front Wide Speakers
JTR Neosis 110HT
Surround Speakers
JTR Neosis 210RT
Surround Back Speakers
JTR Neosis 210RT
Front Height Speakers
JTR Neosis 110HT-SL
Rear Height Speakers
JTR Neosis 110HT-SL
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JTR Captivator 2400 x6
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The absorption panel is covering the diffusor right now.
 

Sonnie

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Front Speakers
RTJ 410
Center Channel Speaker
MartinLogan Focus C-18
Front Wide Speakers
JTR Neosis 110HT
Surround Speakers
JTR Neosis 210RT
Surround Back Speakers
JTR Neosis 210RT
Front Height Speakers
JTR Neosis 110HT-SL
Rear Height Speakers
JTR Neosis 110HT-SL
Subwoofers
JTR Captivator 2400 x6
Other Speakers or Equipment
VTI Amp Stands for the Monoblocks
Video Display Device
Sony 98X90L
Remote Control
Universal MX-890
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FireCube for movies and Lenova Carbon X1 for Roon
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Tidal
qobuz
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Dish Joey 4K
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Zero Surge 8R15W-1 | Salamander Synergy Equipment Stand

ddude003

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Yamaha RX-A850 Pro (the other 5 channels lol)
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MacBook Pro, Custom i7 7700k De-lid 2xAsus1080ti GFX Audirvana Studio, Hang Loose Convolver, Pulsar Massive & 8200, LiquidSonics, SoX
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Chord Electronics Ltd. Qutest
Universal / Blu-ray / CD Player
Sony UBP-X700 /M Ultra HD 4K HDR & PS5
Front Speakers
Martin Logan ElectroMotion ESL
Center Channel Speaker
Martin Logan Motion C2
Surround Speakers
Martin Logan Motion 4
Surround Back Speakers
Martin Logan Motion 4 (yes, another set of these)
Subwoofers
Martin Logan Dynamo 700
Other Speakers or Equipment
Cifte 12AU7 NOS & Genalex Gold Lion Tubes in Pre
Video Display Device
Samsung The Premiere LSP7T UST Laser Projector
Screen
Elite Screens Aeon CLR3 0.8 Gain 103-inch
Remote Control
PrimaLuna, Lumin iApp, Samsung & Yamaha
Streaming Equipment
Netgear Nighthawk S8000 Streaming Switch, Lumin U1 Mini Streamer Transport
Streaming Subscriptions
QoBuz Studio Premier, Amazon Prime & Netflix
Other Equipment
ThrowRug, SaddleBlankets, WideBand & Bass Traps...

ddude003

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More  
Preamp, Processor or Receiver
PrimaLuna Dialogue Premium TubePre (2 channel+sub)
Main Amp
McIntosh MC152 SS Amp (2 channel)
Additional Amp
Yamaha RX-A850 Pro (the other 5 channels lol)
Computer Audio
MacBook Pro, Custom i7 7700k De-lid 2xAsus1080ti GFX Audirvana Studio, Hang Loose Convolver, Pulsar Massive & 8200, LiquidSonics, SoX
DAC
Chord Electronics Ltd. Qutest
Universal / Blu-ray / CD Player
Sony UBP-X700 /M Ultra HD 4K HDR & PS5
Front Speakers
Martin Logan ElectroMotion ESL
Center Channel Speaker
Martin Logan Motion C2
Surround Speakers
Martin Logan Motion 4
Surround Back Speakers
Martin Logan Motion 4 (yes, another set of these)
Subwoofers
Martin Logan Dynamo 700
Other Speakers or Equipment
Cifte 12AU7 NOS & Genalex Gold Lion Tubes in Pre
Video Display Device
Samsung The Premiere LSP7T UST Laser Projector
Screen
Elite Screens Aeon CLR3 0.8 Gain 103-inch
Remote Control
PrimaLuna, Lumin iApp, Samsung & Yamaha
Streaming Equipment
Netgear Nighthawk S8000 Streaming Switch, Lumin U1 Mini Streamer Transport
Streaming Subscriptions
QoBuz Studio Premier, Amazon Prime & Netflix
Other Equipment
ThrowRug, SaddleBlankets, WideBand & Bass Traps...

Sonnie

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Universal / Blu-ray / CD Player
Panasonic UB9000 4K UHD Player (for media discs)
Front Speakers
RTJ 410
Center Channel Speaker
MartinLogan Focus C-18
Front Wide Speakers
JTR Neosis 110HT
Surround Speakers
JTR Neosis 210RT
Surround Back Speakers
JTR Neosis 210RT
Front Height Speakers
JTR Neosis 110HT-SL
Rear Height Speakers
JTR Neosis 110HT-SL
Subwoofers
JTR Captivator 2400 x6
Other Speakers or Equipment
VTI Amp Stands for the Monoblocks
Video Display Device
Sony 98X90L
Remote Control
Universal MX-890
Streaming Equipment
FireCube for movies and Lenova Carbon X1 for Roon
Streaming Subscriptions
Lifetime Roon Subscription
Tidal
qobuz
Netflix
Amazon Prime
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Dish Joey 4K
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Zero Surge 8R15W-1 | Salamander Synergy Equipment Stand
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.
 

Trdat

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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?
 

Sonnie

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Intel NUC w/ Roon ROCK
Universal / Blu-ray / CD Player
Panasonic UB9000 4K UHD Player (for media discs)
Front Speakers
RTJ 410
Center Channel Speaker
MartinLogan Focus C-18
Front Wide Speakers
JTR Neosis 110HT
Surround Speakers
JTR Neosis 210RT
Surround Back Speakers
JTR Neosis 210RT
Front Height Speakers
JTR Neosis 110HT-SL
Rear Height Speakers
JTR Neosis 110HT-SL
Subwoofers
JTR Captivator 2400 x6
Other Speakers or Equipment
VTI Amp Stands for the Monoblocks
Video Display Device
Sony 98X90L
Remote Control
Universal MX-890
Streaming Equipment
FireCube for movies and Lenova Carbon X1 for Roon
Streaming Subscriptions
Lifetime Roon Subscription
Tidal
qobuz
Netflix
Amazon Prime
Satellite System
Dish Joey 4K
Other Equipment
Zero Surge 8R15W-1 | Salamander Synergy Equipment Stand
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?
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.
 

ddude003

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PrimaLuna Dialogue Premium TubePre (2 channel+sub)
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McIntosh MC152 SS Amp (2 channel)
Additional Amp
Yamaha RX-A850 Pro (the other 5 channels lol)
Computer Audio
MacBook Pro, Custom i7 7700k De-lid 2xAsus1080ti GFX Audirvana Studio, Hang Loose Convolver, Pulsar Massive & 8200, LiquidSonics, SoX
DAC
Chord Electronics Ltd. Qutest
Universal / Blu-ray / CD Player
Sony UBP-X700 /M Ultra HD 4K HDR & PS5
Front Speakers
Martin Logan ElectroMotion ESL
Center Channel Speaker
Martin Logan Motion C2
Surround Speakers
Martin Logan Motion 4
Surround Back Speakers
Martin Logan Motion 4 (yes, another set of these)
Subwoofers
Martin Logan Dynamo 700
Other Speakers or Equipment
Cifte 12AU7 NOS & Genalex Gold Lion Tubes in Pre
Video Display Device
Samsung The Premiere LSP7T UST Laser Projector
Screen
Elite Screens Aeon CLR3 0.8 Gain 103-inch
Remote Control
PrimaLuna, Lumin iApp, Samsung & Yamaha
Streaming Equipment
Netgear Nighthawk S8000 Streaming Switch, Lumin U1 Mini Streamer Transport
Streaming Subscriptions
QoBuz Studio Premier, Amazon Prime & Netflix
Other Equipment
ThrowRug, SaddleBlankets, WideBand & Bass Traps...

Trdat

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Nov 6, 2019
Messages
186
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.

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?
 

Trdat

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Nov 6, 2019
Messages
186

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.
 

Sonnie

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Computer Audio
Intel NUC w/ Roon ROCK
Universal / Blu-ray / CD Player
Panasonic UB9000 4K UHD Player (for media discs)
Front Speakers
RTJ 410
Center Channel Speaker
MartinLogan Focus C-18
Front Wide Speakers
JTR Neosis 110HT
Surround Speakers
JTR Neosis 210RT
Surround Back Speakers
JTR Neosis 210RT
Front Height Speakers
JTR Neosis 110HT-SL
Rear Height Speakers
JTR Neosis 110HT-SL
Subwoofers
JTR Captivator 2400 x6
Other Speakers or Equipment
VTI Amp Stands for the Monoblocks
Video Display Device
Sony 98X90L
Remote Control
Universal MX-890
Streaming Equipment
FireCube for movies and Lenova Carbon X1 for Roon
Streaming Subscriptions
Lifetime Roon Subscription
Tidal
qobuz
Netflix
Amazon Prime
Satellite System
Dish Joey 4K
Other Equipment
Zero Surge 8R15W-1 | Salamander Synergy Equipment Stand
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?
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.
 

Trdat

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Messages
186
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.

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?
 

Sonnie

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I don't think the material would matter that much as long as it is reflective.
 

VinceHoffman

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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.
 
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