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PostPosted: Wed May 15, 2013 8:13 am 

Joined: Mon Oct 22, 2012 2:11 am
Posts: 1
Location: Utah, USA
I'm hoping to get some input on the front end of my mastering room build as I have a few unusual solutions for flush-mount monitors and acoustic treatment.

Below you'll see a few images of my ideas. The monitors themselves are a mild variation of some well-known and respected monitors on the market, and uses the same drivers and volumes. The baffles themselves make up the angled sections of the front wall. Knowing that the baffle itself could become a radiating surface, it will be constructed of 1.75" mdf, will be braced against the box in several points, and the whole enclosure assembly will be bolted to the concrete floor and concrete wall behind with steel members, which will be filled with sand. It's not moving.

The monitors themselves can't be stuffed all the way into the corner as that puts my listening position in the middle of the room. In order to make room for a couple pieces of gear, I'd like to stay away from the usual RFZ approach of continuing the flared wall on the outer edge (1st reflection points will still be treated), so I've returned the wall surface to parallel to the front wall. This is where my knowledge gets a bit fuzzy on implementing this design. Strictly speaking, this isn't the 2π space with further reinforcing angles that we're looking to achieve with flush-mounting. There could be some mild baffle-step on that far side. Does anyone know of research on single-sided baffle step diffraction? Any experience with this in their designs? I've seen Phillip Newell do something like this, but in wider rooms with wider baffle walls.

You'll see that I have two variations for the baffle width, one at 2.5', the other at 3'. Thoughts on how the 6" difference could play into my solution? With the 2.5' baffle, the drivers are offset in the baffle. This won't be an issue until the very low-mids, but given the baffle width and pseudo flush-mount this could pull it into the realm where sound loses its directionality. Again, thoughts? Formulae to calculate the potential affected frequencies and attenuation? I'm considering the narrower baffle because it allows for some rackspace in the wall and I'm hoping to use that as my 'machine room,' as it leaves my gear accessible, surrounded by sound damping, and vented to a small utility room in an adjacent room.

Additionally, the adjoining wall surfaces are intended to be binary-amplitude-type diffusers with heavy bass-trapping behind. You can see a cross-section in the third image. Considering the angle and relative density of the materials (.5 mdf and 3~5lb/Ft2 fiberglass) I'm anticipating that diffraction will keep the low waves from the speakers skipping across the surface instead of getting sucked behind the wall. Again I'd like to hear thoughts and math.

I appreciate your input. I read the Everest book years ago, and a few perusals therein during my planning process over the recent months hasn't refreshed my memory on solutions to apply to this. It doesn't help that baffle-step, SBIR, and horn effects of angled walls remain topics of current research and discussion. I've read articles by Lachot, King, and others, but can't find anything concrete. I'm hoping you have.

Thanks again.

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