half a meter to the sidewall is sufficient for the vivid woofers. I know a person who has G1's less than a meter from the sidewall and it sounds great.
I added two absorber panels (2'X5"X 7" thick) to the side walls at the point of first reflection. This does two things. First it absorbs that nasty reflection from the side wall and second, it help s with the modal ringing of the width modes...........
The equipment was spread across the front wall between the speakers. Although the speakers were about 1' in front of it, moving the equipment to the side wall toward the rear of the room would be beneficial. It would not interfere acoustically between the speakers and would allow greater flexibility in speaker placement.
Question-1:
Can you post a photo of entry door with 7" deep absorber mounted to it?
Question-2:
The more reading I do, the more I understand your design of this room.
I assume the 7-inch deep first reflection side panels are full range which is as I understand is how it should be, but does this actually narrow the room at that point?
Question-3:
In my small room my DIY early reflection curved diffractors may be giving me ringing as you describe, but is far less damaging than my attempts at absorption at same point.
In your opinion can curved products from Acoustic Geometry, Flex-48, and others serve both as diffusers of highs and mids plus serve as absorbers of low frequencies?
I've read the charts in product testing PDF's but lab tests involve 8'x8' arrays of multiple diffusers and not single units at sidewall locations.
Question-4:
Appears that you know equipment side wall location after the early reflection points is best. Yet equipment is on front wall. Was this because of the client request/ demand/expectation?
Was this a future battle, one you did not want to fight right now?
Great recommendations of what to look into.It looks like your speaker is too close for the cylinder to work well. If you want to dry diffusion maybe something like a couple of the GIK Gotham 23's. you could also try something with a lot of flexibility like the Vicoustic totem. You can mix and match to tune to the sound you are looking for.
The speaker he has in the room is about as large a speaker that would logistically fit into a room that size. I would have no objection to a small 3 way speaker (or even 4 way like the Giya G4). The main goal of this would be to spread the "load" that is carried by the woofer in a 2 way design. But whatever speaker that is chosen it needs lot be already lean in the bass for a room this small. I think the Magico Q1 would be awesome. A sealed design is best as we are trying to roll off the bass anyway. I don't need a port trying to boost the bass output of the mains. Another good choice would be the YG Carmel 2.
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