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In the Forum: Horn-Loaded Speakers
In the Thread: Designing and building a 5 channel horn loaded (looking for directions on my way)
Post Subject: Last words on foam and other updatesPosted by kodomo on: 9/22/2016
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After trying these reticulated foams for some time now, I ended up with using them only on the JMLC 1400 with the Radian 475 beryllium drivers. I had a smallish bump about where it worked. It flattened out and the sound changed a little. It sounded a more airy and open when the bump was there but I have judged that it was not natural. The sound is a little more controlled on the higher registers now. It is very easy to take them out as well, so when I feel like the string section needs more air (as if in a bigger concert hall) I can take them out 
This is how the setup is as of now. The floor is carpeted and underneath the carpet, I also have heavy felt lining. The ceiling is full of quadratic diffusors. This is the best I can get on listening. The interesting thing is the opposite works best for recording. Reflection on the floor and absorption on the ceiling.
The whole equipment rack is now detached from the listening room. It is on another concrete slab. I will be now working on my bass boxes a little more. As they are reflex boxes with absolutely no port noise, I am satisfied with them and will continue updating them. I will put 2mm Bitumen inside all three sides except the front plate. Then felt and opposite the drivers some acoustic foam too. I also have the shop cut the densest granite and put two layers of them on top of each other. They are to go under the bass boxes as they rest on carpet now. Each block is about 100kg's.
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