It looks magnificent! Congrats! Great effort!
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3D printing a QRD N53 diffuser
- Thread starter kemmler3D
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kemmler3D
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- #83
Thanks for saying so, much appreciated.
The best news is my wife has deemed it "not as bad as she thought" so it doesn't have to go straight onto craigslist.
I will need to enlist help to hang it properly... right now it's just sitting on top of a cabinet.
theREALdotnet
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Which spot are you planning on treating with the diffuser, the front wall?
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kemmler3D
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- #85
For QRDs the distance needs to be 3x the minimum design wavelength, which limits me to the back wall (behind the LP).
I am using it for an office nearfield setup where I sit very close to the front wall. I plan on treating the front wall (and maybe ceiling) with BAD panels at some point in the future...
Cool project! Reminds me of these:
www.acousticmanufacture.com.pl
www.acousticmanufacture.com.pl
Skyscraper 101/101 - acoustic manufacture
www.acousticmanufacture.com.pl
Dyfuzor Skyscraper 73/183 wood - acoustic manufacture
www.acousticmanufacture.com.pl
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kemmler3D
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- #87
Totally, it's the same concept / design but probably with a different process of building it. I wonder how much they cost... the wood one is 300Kg LOLCool project! Reminds me of these:
Skyscraper 101/101 - acoustic manufacture
Dyfuzor Skyscraper 73/183 wood - acoustic manufacture
The plastic one is not really large enough according to the theory. It's said that wells smaller than 2.5cm x 2.5cm will cause loss of high frequencies... the 101 unit is only 1cm per well.
Of course a 2.5m x 2.5m panel is not practical in any sense. Which is probably why you don't see them very often. It would be an interesting challenge to build one, but I think it would need to be assembled in sections and hang from a cabinet rail and would have to ship in several pieces...
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Why? High freq require smaller wells. I guess there is a practical limit on well depth to well area.
Famous Blackbird Studio C is a nice example (not very practical nor affordable though). Ceiling panels are partially with additional high freq diffuser.
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kemmler3D
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- #89
According to the Cox / D’Antonio book wells with width of less than ~2.5cm suffer from viscous losses which tends to affect high frequencies the most. I think this could be desirable in some rooms, but then you have a less predictable mix of diffusion / absorption... I think above that width you simply get diffusion without significant absoprtion. The measurements in my room seem to show that, roughly.
However, I think that recommendation is for wells with fins, I imagine it's less of a problem for open wells like the diffuser I made.
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kemmler3D
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- #91
I have some measurements that are almost ready to share, but I haven't had a chance to record the "after" pseudo-binaural audio - things are busy around here, but I haven't forgotten!
Overall I think it makes a subtle but good audible difference, but so far that's just subjective claptrap of course...
It is more or less in place though - I say "more or less" because it's just sitting on top of the cabinet, I need to enlist a sturdy friend to help attach it to the wall properly. Definitely a "measure twice" situation.
I have no idea how people install things like this made of wood. 300 kilos... do you need a forklift to install it?
Overall I think it makes a subtle but good audible difference, but so far that's just subjective claptrap of course...
It is more or less in place though - I say "more or less" because it's just sitting on top of the cabinet, I need to enlist a sturdy friend to help attach it to the wall properly. Definitely a "measure twice" situation.
I have no idea how people install things like this made of wood. 300 kilos... do you need a forklift to install it?
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