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Making easy DIY "Depot" sound Diffuser panels, step by step
Making easy DIY "Depot" sound Diffuser panels, step by step
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Old 25th December 2017, 03:50 PM   #131
rickmcinnis is online now rickmcinnis  United States
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Finally built some.

I have this fireplace monolith two/thirds of the way in the room which is 91 inches wide. So I made 96 inches tall by 83.5 wide version of the 5 panel design at ARMG

I have moved my chair much closer to the speakers as you suggested - probably 5 feet minimum. I had tried this position before installing the diffusers just to get acclimated and found it acceptable but I did miss the blending I got from being back, almost to the monolith, in listening distance. At this point I had lots of rock wool 2 inches sheets behind me (tried in varying configuration).

I had tamed the bass with large traps in the corners. It measures what is probably as good as it gets in my room.

No question the room was overdamped. Maybe it is the power of suggestion but i suspect more of being made aware but the room did feel uncomfortable with too much damping. And this was a long way from a really damped room so i cannot imagine how strange it must seem in a seriously overdamped room.

The diffuser was finished yesterday afternoon so it is not as if I have listened for a properly long period to make any judgments. But that never stops us for going on, does it? (all of the rock wool was removed)

I was expecting a change in tone. Not that I felt my system was in dire need of that I just thought that would be part of the sound. More warmness was what was expected. What I do hear is a significant increase in resolution. As Mr. Waslo says these do make more difference than an amplifier upgrade and in many of the same ways of an amplifier upgrade. Most importantly the great benefit of doing this is you cannot get this increase in resolution any other way.

I did not use foam board. Gluing the stuff together seems to be a problem. I did not want to experiment with materials and then i started thinking if this thing is reflecting sounds we want to hear then it seems, aesthetically, wood would be a better surface.

I ended up using HD 1/4 birch ply - which ends up being not that thickness - for the back and the front of the "depth chamber". It might be a little too thin though the structures when glued and nailed (and left to dry) are extremely stiff.

I used studs for the spacers. Squared them off and then cut to the depth needed. had to add a spacer. The depths are 1.25, 3.25, 3.75, 3.25, 1.25 for the spacers.

For the first step I used HD 1/2 inch ply which again is not very close to 1/2. There was no other choice at home depot so I hope it is not too far off. I used 1/2" pine boards for the top steps. The birch play is nice looking and seems to be well made.

I am starting to wonder if the pipes formed by the "depth chambers" are adding some resonances? I did turn down the speakers that handle 40 to 125 hz and thought it sounded better after listeing for a bout an half hour. When i touch the diffusers they are lightly vibrating which could be good, as in Michael Green's tuning boards, or something that needs to be fixed. Only time will tell.

I am wondering if i should not fill the chambers with GREAT STUFF? I would appreciate thoughts on that.

I am very glad i made these. Now that I have done them I know I could do another set much quicker, which leads to another question - can one place a diffuser on only one side wall or would the effect be strange? Almost finished off a whole BIG bottle of TiTEBOND glue to make these. I did spend more money that the article suggests but these are in the main part of my house so I intend to make them look OK.

I like coating things with shellac so that is what will eventually happen to these.

THANKS very much to Mr. Waslo for the inspiration.
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Last edited by rickmcinnis; 25th December 2017 at 03:57 PM.
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Old 25th December 2017, 09:37 PM   #132
jameshillj is offline jameshillj  Australia
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Pictures, if you would?

It sounds like you have left gaps at the sides where the levels change, but then you mention the pipes formed by the "depth chambers" so I'm a bit puzzled how you've put this together ....

For your bass traps, try covering part of the front surface with something reflective to higher frequencies like Ali kitchen foil, heavy plastic strips, etc - temporarily pin the extra material on and if it is beneficial, can replace this with a more attractive finish later - strips of newspaper is an east start - a couple of layers and about 2 - 3" wide and about 3" apart
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Old 27th December 2017, 03:59 PM   #133
rickmcinnis is online now rickmcinnis  United States
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There are "holes in the top and bottom - all sides are solid.

I placed a board on top to cover the opening and it did seem to stop the upper bass enhancement.

I am going to add another layer of this 1/4" (.200" actual) plywood to get closer to a step of 10 cms from wall to diffuser.

I will post a picture tomorrow.

Bass traps remain - I removed rock wool that was used for other reflections. Four of the bass traps are commercial devices with a diaphragm to aid in low frequency absorption. In the room behind the monolith I have DIY bass traps consisting of a huge roll of fiberglass in the corners with 5 - 2" x 4' x 8' sheets of rock wool across the corner. The big roll of fiberglass is within the triangle formed by the rock wool. These are so far away that adding a reflective surface would do nothing for them

20 hz to 100 hz sounds pretty good. I do perceive the diffusers adding greatly to the cohesion of the low bass to the rest of the range.
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Old 4th January 2018, 06:20 PM   #134
rickmcinnis is online now rickmcinnis  United States
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Picture
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Old 4th January 2018, 07:18 PM   #135
bwaslo is offline bwaslo  United States
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Making easy DIY "Depot" sound Diffuser panels, step by step
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[W9MJE] Horn spreadsheet SynergyCalc/; SmallSyns SmallSyns;
Crossover design Xsim; Depot diffusor super-easy diffusors
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Old 9th January 2018, 06:17 PM   #136
phivates is online now phivates  United States
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+1 on the shellac. Pretty cool how such a low profile assembly can do so much.
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Old 12th February 2018, 10:34 PM   #137
Cambe is offline Cambe
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Listening update.

Irshad and I are really really enjoying listening to what the diffusers are doing in the listening room. Thanks again for a great project.
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Old 6th March 2018, 05:58 PM   #138
kgveteran is offline kgveteran  United States
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Would these be ok on opposing walls where slap echo is an issue, i want to avoid too much absorbtion
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Old 6th March 2018, 06:09 PM   #139
bwaslo is offline bwaslo  United States
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Making easy DIY "Depot" sound Diffuser panels, step by step
I would think so. I have mine at the sides (and slightly behind me) and they work well there, make the room sound much more spacious.
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Old 6th March 2018, 07:51 PM   #140
kgveteran is offline kgveteran  United States
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Quote:
Originally Posted by bwaslo View Post
I would think so. I have mine at the sides (and slightly behind me) and they work well there, make the room sound much more spacious.
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