Originally Posted by bwo
This is what I think:
-Too shallow diffusors. The numbers Svanå writes on their webpage is somewhat misleading. A diffusor needs to be thicker then what Golden Horn is for effective diffusion down to 800Hz.
-Too many diffusers in the room
-Diffusors are placed at wrong places
-You don't have a RFZ or an ISD-gap. Also likely lack a termination
-And you're sitting too close to the rear wall
RPG has some pretty broadband diffusors. You could probably get them to custom design some that are deeper too. RPG Diffusor Systems http://www.rpginc.com/products/diffr...cal%20Data.pdf
I was primarly thinking about your room upstairs, but I would say much of it counts for your second room as well.
If one wants accuracy I would treat a room the following way:
-Treat room modes. Preferably with pressure based traps.
-Create as large ISD-gap as the room permits. The reflections should be down by -20dB at minimum. -30dB would be better. Treat reflections surgically or redirect them to the rear of the room if that's possible.
-Aim for a termination of that ISD gap with -12dB or lower in gain.
-A lateral decaying diffuse field. Make sure one isn't sitting too close to the diffusors.
-Have an even decay.
I'm gonna try to answer accordingly..
1. The data that you want to see for any diffusor is totally irrelevant. If the data of some kind is shown from various brand is good enough for me. I can never predict how the diffusor is gonna be working in my room only from seeing the dataspec. If it is misleading, then it's up to you to feel that.
2. I can't agree that to many diffusor is gonna degrade the performance.
3. Right or wrong is always an issue to discuss where to place diffusor. Where I have my diffusor now, is totally perfect.
4. I don't need and don't care about RFZ or ISD-gap.
5. I sit close to the diffusor everytime I listen to music and have no problems at all. But maybe, this has to do that I have the right kind of diffusor.
You are saying I can get costum design from RPG to have them deeper and that is exactly what I can get for my diffusor. One can always build a diffusor within a diffusor. But, in my room it is more than enough.
Comments on how you would treat a room:
What you are saying here is that you are heading for a LEDE/RFZ in a normal listening/livingroom. So for you, this means that this is the only way. As I understand it, it can never be implemented in a listening/livingroom according to this trademark, because, I can never follow the criteria that is involved when building this LEDE/RFZ concept. If I can not follow and meet this criteria then I can never call it a LEDE/RFZ room. I have allready a deviation in my room.
This is clearly stated in "Master Handbook of Acoustics" on chapter 21, page 429.
If the intention is to build a controlroom then I can accept that LEDE/RFZ is one option that can be followed. But I can never accept that this has to be followed in a ordinary listening/livingroom. This means that as and end user of all the music that is mixed with this LEDE/RFZ in mind can never be utilized in a normal listening/livingroom. Then it has to be something wrong here. Then maybe this concept is wrong from the beginning due to the fact that the majority of us have already bad rooms.
So, your choice of accuracy and to treat a room is very difficult to achieve for most of us. Then I can't stop asking myself if you have this in your listening/livingroom.
Do you have this????
My room upstairs and measurements on this thread is an good example of how it can be treated in another way. I will say it again that I don't need a LEDE/RFZ treated room.