Really small home mix room - sketchup file links included

Started by autophase on 1 September 2010. 29 replies, 2010–2011. In the Library under Acoustic treatment.

Originally posted at johnlsayers.com, topic 14768.

congrats! looking forward to the photos!
hi guys, I am aware I havent yet posted the promised pictures, I intend to do this soon, but I want to make the final adjustments to the room before doing so. I need to finalise my speaker positions, and I need some advice, please see the sketch up at the beginning of this post for reference. I have treated my room more or less as advised, with 2 room height super chunks in the front corners, a large panel in between those. Filled in the window and 6 room height panels, 3 on each side, which has given fantastic results FWIW. Now I know the monitors should be at least 3' away from the side and rear walls, however I can't afford this luxury with the space available. its more like 1', however they are right next to the front superchunks, so i think that will eleviate the majority of any bass reflection Im aware the monitors should point inward by 30 degrees to the listeners position. After doing some experimenting I find I'm getting a really nice bass response if I sit at the back of the room while the speakers are at the front. I am tempted to move the work station to the back while have the monitors on stands at the front. But I'm worried this nice bass I am hearing is artificial, and not a true representation. Could anyone give thier technical opinion based on the room dimesions given in the sketch up images, of how far apart the monitors and where I should place my self?
as a starting point - speakers set 70% of the room width apart and forming a 60° sided triangle with the seating position located 38% of the room length from the front wall. there are a few ideas about speaker placement RE the front wall - either put as close the front wall as possible (and getting a bass boost many times), or far enough away (> 6') to avoid interference. the sides are typically handed via your side wall / first reflection point absorption. finally, the cloud helps eliminate the overhead reflections and in small rooms, helps to solve the ceiling-floor modal bits.
Soundman2020 wrote:
Mineral wool is fine. So is ordinary pink fluffy fiberglass. But density is important: Look for something in the range of 48 kg/m3, roughly (that's for mineral wool: a bit lower lower density is better for fiberglass). Styrofoam and similar closed-cell insulation products are useless for this: it has to be open cell. - Stuart -
Hi, with regard to this post, you mention the absorption material should be in the region of 48kg/m3 is ideal, and that open cell is best. do you have a link where I can do more reading about this, Its all well and good saying it but i would like to understand why? :D Thanks
IR-832 has some information on that, and the Wyle report has some detailed analysis too. There's some info (but not much) in IRC-rr169, IR-761, IR-766 and IR-693. NRCC-44210 also mentions it in passing. There's more too, but I can't find it right now. I think Thermfiber put out a couple of papers on it too, which were good: OC might have something on their web site too. I don't recall. but you can get the basic outline form the above. - Stuart -