Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 12, 2018 1:50:58 GMT
I am so pleased that I found this forum.
Without going too deeply into my entire listening space situation - which is quite unique, here is how I would like to begin:
1: listening space in question is strictly for 2 channel system at home.
2: my main concern: back wall is 3.5 feet behind my head.
3: wall is drywall.
How do I know if I need absorption or diffusion behind me?
Is there a general rule?
|
|
|
|
Post by rock on May 12, 2018 3:49:18 GMT
More info about your room dimensions and set up would be helpful. Lacking that, absorption on the rear wall is generally more useful in "small" rooms (like most rooms in our homes). IIRC, diffusion works well after 6' depending on the lower diffused frequency...or something like that...but only after reflection and modal issues have been addressed with absorption.
So in your case, best to consider absorption.
|
|
|
|
Post by Ethan Winer on May 12, 2018 17:53:22 GMT
A shallow diffuser, about three inches deep or so, would be okay behind you. The general rule is one inch of diffuser well depth for each foot of distance. But you also need bass trapping. So it's common to have a medium size diffuser at ear height behind you, and thick absorption everywhere else (on the entire wall if possible).
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 12, 2018 23:40:55 GMT
Room.pdf (482.15 KB) Thank you for the replies. I have attached a drawing of my situation. This is the basement of my home. It is completely finished with drywall on all walls and ceiling. The celing is about 7 feet high. The drawing is NOT to scale - particularly the distance from the speakers to the chair. Here are some notes: 1: the areas that I am most concerned about are marked in dark marker: The areas behind the couch and the area in front of the speakers. 2: the speakers are Apogee Duettas - which are dipole ribbons. So the sound emanates from the front and the back. 3: in case it is not clear: the width of the room is 33 feet (9.5 feet + 14.5 feet + 9 feet for the width of the alcove behind the speakers. I think you can see why I consider this area to be more of a "space" as opposed to a "room". Any direction that you can give me would be great. If you can pint me to actual products that Ethan makes so that I can see what they are would be great!
|
|
|
|
Post by rock on May 13, 2018 0:53:18 GMT
First sorry for the mis-information regarding the diffusor rule and thanks to Ethan for setting me straight on that one!
Your room or space has a number of possibilities. It seems very open and I wonder why your chair is so far from the speakers and so close to the back wall. It seems you have oriented your listening position along the width (the short distance) but since your drawing is not to scale, maybe the closet is shorter than is looks? Did you read Ethan's "Read this First"? What did you take away from that as far as your set up goes? What about the 38% rule? Did you try a set up using that idea? What about putting the speakers on the right wall and moving your listening position somewhere in the middle of them facing the right wall? Measurements will help you fine tune the exact positions. Add basstraps in the corners and RFZ panels in all the usual places.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 13, 2018 1:15:50 GMT
First sorry for the mis-information regarding the diffusor rule and thanks to Ethan for setting me straight on that one! Your room or space has a number of possibilities. It seems very open and I wonder why your chair is so far from the speakers and so close to the back wall. It seems you have oriented your listening position along the width (the short distance) but since your drawing is not to scale, maybe the closet is shorter than is looks? Did you read Ethan's "Read this First"? What did you take away from that as far as your set up goes? What about the 38% rule? Did you try a set up using that idea? What about putting the speakers on the right wall and moving your listening position somewhere in the middle of them facing the right wall? Measurements will help you fine tune the exact positions. Add basstraps in the corners and RFZ panels in all the usual places. Thanks for the reply Rock. The position of this music system cannot be changed. There are other things happening in the basement that prevent that. So this is where it has to be. As I mentioned in my post I am about 9 feet from the plane of the speakers to my head - the drawing makes it seem that there is a vast space between the speakers and my chair but that is exaggerated due to not being to scale. |
|
|
|
Post by Hexspa on May 14, 2018 0:36:35 GMT
Your basic question is regarding rear wall absorption and diffusion.
There are no 'rules', per se. There are only outcomes and limitations. If your rear wall is less than 10' behind you then you need something to manage reflections.
Absorption deadens reflections and also mitigates low frequency ringing. Diffusion disperses the reflections over time and space but does nothing for bass, unless you have a massive diffuser.
Once your modal problems are solved, look into diffusion. It will make your sound stage larger, if less accurate than absorption.
I know you said you can't but you should rotate your triangular orientation 90 degrees counter-clockwise.
|
|
|
|
Post by Ethan Winer on May 20, 2018 19:13:15 GMT
First sorry for the mis-information regarding the diffusor rule and thanks to Ethan for setting me straight on that one! Your six foot comment wasn't wrong because most "better" diffusers are at least six inches deep. |
|
