And here is the final state of my studio with the following treatment in place
(All treatment with RW45 Rockwool)
Rear Wall: Covered to 30cm depth
Rear Wall / Ceiling Corner: Superchunk 30cm edges
Front Wall / Side Corners: Superchunks 60cm edges
Front Wall / Ceiling Corner: Superchunk 60cm edges
Side Wall First Reflection Points: 20cm thick panels
Front Wall Between Speakers: 10cm thick panel
Cloud 1: 36mm MDF, hanging at 15° Covered with 10cm RW45
Cloud 2: 36mm MDF, hanging at 30° Covered with 10cm RW45
(Both clouds ray-traced to send energy to rear wall)
Here are some Sketchup drawings for a visual idea.
I've made some of the panels transparent so you can see what's going on more clearly:
Studio copy.jpg
Complete Studio 2 copy.jpg
Complete Studio 3 copy.jpg
Complete Studio 4 copy.jpg
Here is the MDAT for the studio above, as shown in the diagrams.
https://www.dropbox.com/s/5nu9rvxqwhi3c ... .mdat?dl=0
Here's the full Waterfall for the studio: (1/48)
Full Waterfall All treatment in place.jpg
And here it is smoothed to 1/6
Full Waterfall Smooth All treatment in place.jpg
It's come a long way since I started. Thanks so much to Stu, and Greg for their help here, and to the board in general for the hundreds of previous posts that I've read trying to research this. It's been a lot of work and learning. This was an empty garage three months ago.
I'm onto my last challenges, I think.
99hz null
I feel like I've exhausted my knowledge here, and the biggest hurdle I'm still stuck with is the 99hz null.
Waterfall All treatment in place.jpg
Having apparently deduced that it's not floor-reflection, (see post above) I really don't know where to go with that. If it's rear wall, I've already maxed out the space with RW45 that I possibly can fill. Any ideas welcome.
Impulse
Impulse All Treatment In Place.jpg
This seems to be ok-ish, if I've understood Stuart's previous posts on this correctly.
I can see that I've got two very quick reflections creeping up to -15dbfs, at 1.05ms and 2ms. I'm guessing those are off my desk, as I've treated all the reflection points on the wall I think.
There were far more reflections above the -20dbfs mark in previous REW tests, and the side panels and cloud have seen those off.
Decay Times
My next job, before I cover all the rockwool with fabric, is to put some surfaces up to reflect some energy back into the room. I can hear audibly that it is a little dead in here when I listen to music.
Here's the RT60, zoomed in to 500ms. The blue (I think? - I'm colourblind) line is T30, the other one is T20.
RT60 All Treatment In Place.jpg
It's not going to win awards I think, but it's a lot better than it was previously.
So before I start covering stuff in plastic, where's my point of attack here? I'm wary of shooting for every little deviation in the graph and ending up with diminishing returns.
I seem to have a lot of messiness around 150 - 1000hz.
According to the equation that I've found in Stu's posts previously (F = 90 / m) I'm going to need plastic thicker than 6 mil to get anywhere close to this.
Three questions:
1) I'm guessing I'll need wood, not plastic to reflect back some 150-1000hz into the room. I guess the equation still remains the same? I've got some thin boarding I could use - I could weigh that and work out if it is going to reflect the right sort of frequencies.
2) Higher up this thread, Stu recommended around 180 - 200ms decay for my size room. I seem to be getting that, or thereabouts for everything over 1khz. Is it worth my getting some thin plastic drop cloth on the back wall and trying to get those high frequencies reflecting a bit more, or are they looking ok? Subjectively, the room sounds a little dead in the high end to my ears, but that may be because I'm used to less-treated rooms
3) If I put in wood panelling that works out according to F = 90 / m to reflect 500hz (for example) then does it also reflect all frequencies above that too? Like a high shelf on an EQ? Or would it reflect mainly 500hz, and some either side, like a bell curve EQ?
I think that's enough for this monster post for now. If I think of anything else that's scrambling my brain I'll post again.
Cheers!
Owen