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Acoustic treatment for home theater / listening room.

ratiug, modified 5 Years ago.

Acoustic treatment for home theater / listening room.

Youngling Posts: 5 Join Date: 2/17/13 Recent Posts
Hello all,

First things first: Thanks to Genelec for making the best speakers on the planet - hyvvee työtä :)

I've had my pair of 1029A's for 12 years now, listening rooms througout the years have been quite awful to be honest. Now it's finally possible to have a dedicated listening room. I'm trying to achieve a quality enviroment for music and movies. Theme is that speaker positioning and acoustic treatment come first and dsp correction only after that (DSP possibly by Anthem MRX-300's ARC - no A/V receiver at the moment). Because I'm a DIY kind of guy I'm trying to do this by myself - trial and error coming up I guess.

What I hope to hear from you is comments to see whether this all makes any sense.

My setup is:
8030 (L,C,R)
1029A (LS,RS)
7070A (S)

First thing is to decide which one of the two available rooms is better for this purpose.

Room #1 4100*4190*2400mm (ceiling in the back of the room gradually lowers from 2400 to 1200)

This room would need to have the door behind the FL moved and a bit of this and that. Being a square (at least at the moment) sets it's own limitations of course.

Room #2 3900*(originally 2900, could be 7200)*2400mm

A couple of days ago I had some time to sit down and think all kind of variations for the listening room, I came up with this idea - Is there any change for this to work? Originally room #2 is small (~11m2). Would it work if the door and wall behind the listening position is taken down and the rear wall "moves" to 7200. Is the behaviour of the sound totally unpredictable in that scenario? The speaker positions (and speaker icons btw) are straight from Genelec's guide, just scaled to this room. Should the corners behind the listening position also be filled with rockwool? How about flush mounting the 1029A's - good idea?

Thanks for you time in advance
ratiug, modified 9 Years ago.

Re: Acoustic treatment for home theater / listening room.

Youngling Posts: 5 Join Date: 2/17/13 Recent Posts
Hello again,

I did a lot of measurements in the 3m*4m*2,4m -room. I tried dozens of different speaker placements and listening positions.

Equipment used in measurements RME 400 + laptop + ECM 8000 + REW (1/24 smoothing in response).

First I tried to position the speakers so that 4m was the length of the room but that didn't work at all.
Then I rotated the listening position so that 4m became width and this is the best (least bad I guess) I got:




At the moment room is quite empty with no treatment at all. Is it possible to get that room acoustically good by proper treatment? I guess the lower end response can be smoothened with DSP (Anthem possibly) but what about 100 Hz and above? I'm not that experienced in acoustics so I'd apprecieate your thoughts on this one. Would opening the rear wall (as described in earlier post) make things better or worse?

Thanks
ilkka-rissanen, modified 9 Years ago.

Re: Acoustic treatment for home theater / listening room.

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Hi,

Based on your measurements, I would say the starting point is very good. Your room doesn't seem to have strong room modes below 100 Hz which is quite exceptional. It is very easy to get a flat response with some added absorption and EQ. Also modal behaviour and first reflections above 100 Hz are quite easy to fix because they won't require huge thickness of absorbing material any more.

Have you considered contacting a professional company which provides acoustic design? If you don't have much experience with acoustics, I would really really suggest this approach.

Here are a few links for you.

http://www.helimaki.fi/
http://www.promethor.fi/
http://www.riionheimo.fi/Riionheimon_Ak ... usivu.html
http://www.kotiav.fi/
http://www.akukon.fi/site/
http://www.ecuras.fi/index.php/etusivu
http://www.yhtyneetinsinoorit.fi/fi/pal ... unnittelu/
ratiug, modified 9 Years ago.

Re: Acoustic treatment for home theater / listening room.

Youngling Posts: 5 Join Date: 2/17/13 Recent Posts
Thank you for the comments Ilkka. At first I found many strong room modes, but after dozens of measurements and speaker/listening positions I found that to be the best combination.

Thank you for the links also - yes I've thought about professional company, but as a DIY-person I'd like to study, try, measure and learn (at least at first). I think I'll try to build a few movable absorbers (gearslutz-forum has tons of info on those) and place them in corners and on first reflection points, maybe one cloud above the listening position too. Those are quite cheap to make, so I'll try with those first.
ratiug, modified 5 Years ago.

Re: Acoustic treatment for home theater / listening room.

Youngling Posts: 5 Join Date: 2/17/13 Recent Posts
Hello again...
After hundreds of measurements and speaker settings & positions, endless acoustic panel placements etc.
This is what I came up with DIY approach:





There is no acoustic treatment on the ceiling (yet) - otherwise the room is quite thoroughly treated.
L+C+R 8030
LS+RS 1029
S 7070
DSP Anthem MRX300 - ARC is really good.

I'll post more pictures on another post (3/post allowed).
ratiug, modified 5 Years ago.

Re: Acoustic treatment for home theater / listening room.

Youngling Posts: 5 Join Date: 2/17/13 Recent Posts