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#257463 - 04/19/09 03:46 PM Room Treatments
gtpsuper Offline
old hand

Registered: 04/11/09
Posts: 80
I'm looking for any one with experience that can lead me in the right direction about room treatments. I have been looking at some of the Auralex roomanator kits and bass lenrds. I was told that foam doesn't do anything acoustic wise, so I was looking at the Owens Corning 705 FRK and thinking about doing 48"X24"X2" panels. I want to frame them with wood, but what would be a good backing and front covering. Any input would be appreciated or give some suggestions on something. Thanks

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#257464 - 04/19/09 04:00 PM Re: Room Treatments [Re: gtpsuper]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 6969
Loc: Canada
Muslin or similar open weave cloth. If you can blow easily through the cloth it will be acoustically transparent.
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#257469 - 04/19/09 04:23 PM Re: Room Treatments [Re: fredk]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13311
Loc: Iowa
I used reg 703 with no FRK for my first reflection panels and for my corner bass traps. Here is an old thread.

http://www.axiomaudio.com/boards/ubbthreads.php?ubb=showflat&Number=144079&fpart=1
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#257470 - 04/19/09 04:29 PM Re: Room Treatments [Re: fredk]
gtpsuper Offline
old hand

Registered: 04/11/09
Posts: 80
cool thanks, so just drawing the fabric tight front and back should work. 24" is a little wide for wall to ceiling so cutting them in half and doubling them up in the corners.

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#257472 - 04/19/09 04:36 PM Re: Room Treatments [Re: gtpsuper]
gtpsuper Offline
old hand

Registered: 04/11/09
Posts: 80
so 703 would probaly be cheaper? Did you just hang any on the wall flat or just corners. I'm getting a bad null between 50ish hrz up to 70ish. The test tones rise in db's and then around 50 it drops off to almost nothing and then starts rising again around 70. Thats why i'm not getting the mid bass. Room treatments are first then getting the Velodyne sms 1 this summer.

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#257476 - 04/19/09 04:56 PM Re: Room Treatments [Re: gtpsuper]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13311
Loc: Iowa
I never priced the 705, but I'm sure the 703 is probably cheaper. I think I paid about $120 for 12 sheets of 12 x 24 x 2 at a local insulation distributor. My side "first reflection zone"(FRZ) panels are hanging on the wall. I had my son sit in the primary seat while I slide a small flat mirror along the walls/ceiling, when he saw the tweeters I placed a sticker at that point. This is where the middle of my FRZ's are mounted. Just used some heavier picture frame wire and some eye screws to hang them.

For corners you can either use the 12 x 24 x 2 inch panels to straddle the corners, but Ethan from Real traps says you need at least 4" for corner bass traps to be effective. I decided to cut triangles and fill the entire corner.

In my opinion, the treatments should help, but you may never get rid of the dips. I had a SMS-1 also, but sold it as I found that with proper sub placement, and ordering multiple subs placed around the room, you get great reponse and don't need the SMS-1.

I should have my new Denon 3808 soon, then I can start experimenting with Audyssey.
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M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
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#257477 - 04/19/09 04:58 PM Re: Room Treatments [Re: SirQuack]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13311
Loc: Iowa
I have 6 sheets of 703 left over, but I"m sure you don't live near Iowa. \:\)
_________________________
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana

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#257515 - 04/20/09 07:26 AM Re: Room Treatments [Re: gtpsuper]
davidsch Offline
aficionado

Registered: 06/02/03
Posts: 678
Loc: Houston, Texas
 Originally Posted By: gtpsuper
... so I was looking at the Owens Corning 705 FRK and thinking about doing 48"X24"X2" panels.


I am no expert on room treatments, but from what I have read you will need panels thicker than 2" to treat problems in the 50 -70 hz range. I would go with 4" panels and/or corner traps.

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#257521 - 04/20/09 10:07 AM Re: Room Treatments [Re: davidsch]
gtpsuper Offline
old hand

Registered: 04/11/09
Posts: 80
yeah i found some 48x24x4 panels of 703 fairly cheap, 24" wide is kind of large for wall to ceiling so I was going to cut it to 48x16x4. Then do the same for the front corners. I was going to get the sms 1 eq because i'm very limited as to were I can put the sub only the 2 front corners will work, the other corner I tried seem to be a giant null totally, sub sounded like it was in another room. So the panels and the audessy should help I hope.

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#257522 - 04/20/09 10:09 AM Re: Room Treatments [Re: gtpsuper]
alan Offline
connoisseur

Registered: 01/29/02
Posts: 3178
Loc: Toronto/New York/Dwight
Hi gtpsuper,

As Sir Quack has pointed out, probably the most cost-effective solution for getting much smoother distribution of deep bass throughout a room to most listening seats, without the severe nulls and peaks common to most rooms used with a single subwoofer, is to use two subwoofers carefully placed.

I'd also point out that a home theater is NOT a recording studio control room, and that setting up panels to absorb the first reflections will considerably reduce the spaciousness of the front main speakers--their ability to image beyond the boundaries of the speakers. Lateral reflections in concert halls (and outdoors) are what cue our ears and brain to the "size" of the front image, and absorbing those first reflections will reduce the apparent width of the musical source.

There may be exceptions if you have an extremely "live" and reflective space with too many bare surfaces, but generally, despite the wrong advice doled out by "room treatment" vendors and manufacturers, you do not want to absorb lateral first reflections from the front speakers.

Regards,

Alan
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Axiom Resident Expert

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