Control Room moving (design)

Hi, I'm moving to second phase of control room moving process. (Construction thread is here) First of all my thank yous to Glenn and Stuart for their absolutely helping inputs since the first post. Construction has not started yet. I need to finalize the design to be able to order materials and pinpoint where exterior meets interior. Side wall sawtooth resonators: Should I alternate RW (40 kg/m³) and glass wool (22 kg/m³) [RW front, GW back] or go with one type only? - I want to use the inset on front-left as a flush mic closet. Any downsides with it? - I couldn't angle more and go deeper because of space considerations, therefore I think they're not going to be easily tuned. Besides, here's Bassman:

Bassman wrote:

One common misconception about slats is that the various spacing gives you discrete frequencies of absorption (spearate resonators). This is only true if the cavity behind EACH slat is sealed. If the space behind multiple slats is not partitioned off, the effect of various slat spacing is moving the center frequency of the whole slat panel, not the individual slats. Take the average slat spacing for the whole panel to calculate where the panel is tuned. Of course, wool inside and behind the slats widens the absorption bandwidth of the entire panel as well. The really GOOD thing about the various spacing is a better diffusion of upper frequencies as they bounce off the slats. Bottom line is that unless you are partitioning the resonator, don't bother with a calc as it would be an estimate of center frequency at best. Just vary the spacing in some fashion, perhaps even a decorative one, and you should be good. -ashley

- Slats are 10cm below ceiling. I'm planning to install color changing led stripes between. Anyone tried a similar approach? How is the result? Is 10cm more than enough? Rear wall absorber: This vertical design is from Glenn's reply to a post which I can't recall now. It's also similar to Vakis' though John recommended 30cm depth at top. Mine is about 60cm. I'm concerned about the (small room) bass build up , so trying to spare as much space for superchunks. Is it practical? Right wall absorber: RW (RW+Glass wool)filled absorber, 10cm depth, 7.5cm spaced from wall. Right wall, rear corner absorber: RW (RW+Glass wool?) filled absorber, 18.5cm depth, flush mounted to wall, housing light switches. Left wall absorber: RW+GW filled, alternating depth (4 to 26cm), flush mounted. Front superchunks: Smaller panels in front of corner traps is for lighting. I'm looking for a similar result like this"Panic Room" idea. Front clouds: RW filled. Depth (19cm) is approximate. Rear clouds: Depth (10cm) and size are approximate. Will decide after room analysis. Floor:First choice is hardfloor, there's also wood textured vinyl floorings from Gerflor which can be seen here. We're considering vinyl since it's easier to clean. Any drawbacks vs laminated hardfloor? Monitor position: I'm almost at exact %38, but not troubled with being close to %50 anymore.

gulfo wrote:

you might have to sit in that position in the room and make treatments on the side walls and ceiling to accommodate the listener. it's very close to 50% of the room length.

The big problem is monitor's vertical position. The woofer is almost at exact %50 right now. (Desk's top is a little higher than the sketch). I know it's a bad bad thing and the only solution is moving monitors vertically (lower, in my situation). Actually, I was considering lowering the PMCs anyway to position acoustic center of monitors to ear height. It seems that a desk modification is inevitable. Panic Room photo is also a good example for Control 24 desks. Here's the .skp file (Sorry, I couldn't fill up all resonator, traps with RW to show in the sketch) Looking forward to hear about your ideas. Thank you.

you can go with one rigid type of insulation the resonators as they're not very deep. the slats will tend toward the overall center frequency. as a general rule the top and bottom slats should be the largest size used and should tend to have the smallers slats and wider slots towards the middle as this will affect the mid-HF more near your ears and more LF absorption near the top and bottom wall corners. the front corner traps i'd go with the 4" (100mm) rigid and then the pink stuff behind it. or better yet build hangers in lieu of the pink stuff - cellouse fiber board (Homasote) and light insulation wrapped around it and hung roughly floor to ceiling and spaced about 6" (150mm) apart. the closet idea should be OK remember the slat assembly will be heavy and needs good hinges. the vinyl linoleum floor should be fine. you want to decouple those speakers from the desk, maybe some of the speaker pads with the steel plates which angle them down slightly. i don't see any concerns with the lighting concepts.

Thank you Glenn, I've revised the drawing and adding pics and skp. Did I get it right on slat width and spacings? In another thread:

gulfo wrote:

If not homasote, then some other low density fiber board should be ok.

I will go for fiberboard then, no homasote in Turkey.

the closet idea should be OK remember the slat assembly will be heavy and needs good hinges.

Sure. I'll tell the drywall guys to put an extra bar for hinges.

you want to decouple those speakers from the desk, maybe some of the speaker pads with the steel plates which angle them down slightly

I have Auralex Mopads under NS10Ms like this I can use them under PMCs like this. Or consider getting a new pair of RX7 from Primacoustic.

i'd go with the hangers and the RX7 pads.

Can I expect similar performance from hangers like superchunks? Like here http://forum.studiotips.com/viewtopic.php?f=8&t=536.

a slight change to your hanger design - line the cavity with 4" (100mm) rigid insulation, and put a layer of 4" (100mm) rigid insulation across the front, and then the hangers inside.

Did I get it wrong? There's no place left for a hanger if all dimensions are 10cm.

ok :D then i think you have the answer...

Got it. Go for superchunk ; )

I don't have min. 3m front-back distance so I know that the way to go is broadband traps, not diffusors. However I need to give the room a better look so here are the back trap alternatives. I'd like to go with the 3rd one if those slats do no harm (remember, there are no calculations with placement, just a decorative cover for rockwools behind). (Depth is 15cm max.) What do you think? Thank you.

i would go with #2 because of the symmetry and overall absorption. #3 is artistic but might not be as effective and your sound is more important... choose some nice lighting effects and/or vary the slats on the #2 model to make it more interesting.