Moseskill Studio

[Soundman2020]

my understanding is that this space does NOT need a bass trap due to the design. Can I validate?

In the front wall, no, but you still need plenty of bass trapping in the rest of the room. It's a small room, so modes will be a problem, and therefore bass trapping is needed. If you follow John's design for your speaker soffits, then some of that trapping will be in the form of hangers, under the soffits. The rest can go at the back.

The ratio is supposed to be one of the good ones, but those numbers sure do look awfully close to multiples. Is there something I'm missing here?

It's fine. It passes all the critical tests, the Bonello graph looks good, the modal distribution looks good. All green!

3. You can see the angled board on which will be placed a slot wall moving from the soffits to the side wall. There's currently an opening from the wide end of that angle into the open area behind the soffits. Do I need to close that off? Does it matter one way or the other?

Yes you do, and yes it does! Slot walls are Helmholtz resonators, and that implies that the cavity must be sealed air-tight, and must have the correct depth. So you do need a rigid, solid, air-tight back panel on those.

- Stuart -

[Johnnie]

Thanks Stuart!

The validation is very helpful. Re: the slot walls... Uggh... feeling silly. Getting so focused on the soffits I'm forgetting to pay much attention to the slots themselves. I haven't even thought in terms of their depth yet and that's effect on the frequencies. Appreciate the reminders.

[Soundman2020]

[Johnnie]

my understanding is that this space does NOT need a bass trap due to the design. Can I validate?

In the front wall, no, but you still need plenty of bass trapping in the rest of the room. It's a small room, so modes will be a problem, and therefore bass trapping is needed. If you follow John's design for your speaker soffits, then some of that trapping will be in the form of hangers, under the soffits. The rest can go at the back.

Sorry if that question wasn't clear. I meant it only in regards to the recording area and not to the control room. I definitely plan on doing usual bass traps in the back corners, Absorption on back wall, the first reflection points, the slot walls on the sides of the listening position, and the bass hangars in the soffits as regards the control room. I was really thinking in terms of the recording room which I've tried to adapt from John's "small studio" design. I really want to get that window in there, to improve visibility for a possible eventual expansion into the larger space. If I can get the window in there I can do without a windowed door, but you can see how little extra corner space would be available. The treatment plan for the recording area would (hopefully) be the slotted inside out walls on the two walls with angles, and fabric panel inside out walls on the two remaining walls. Ceiling would depend on what's happening in the room after that.

[Johnnie]

Also, here's one of the links I was referring to that made the claim that steel didn't significantly impact isolation in a double wall assembly, but only in a single wall assembly. Just under number 3.

http://www.stcratings.com/assemblies.html

[Soundman2020]

Also, here's one of the links I was referring to that made the claim that steel didn't significantly impact isolation in a double wall assembly,

Ahhh! Steel STUDS! We are talking about steel studs! I was thinking about sheet steel as a leaf, not as studs. As in a tin shed, shipping container, etc.

OK, so, for metal studs: Yes. Not much advantage. Take a look at IR-761 to get the full truth. Compare the following pages, to see the difference:

Wood --- Metal
P317 vs. P352
P331 vs. P355
P345 vs. P359
P350 vs. P363

Based on that, wood actually looks better! HOWEVER: those are not really "apples to apples" comparisons, since the metal stud tests were done with less insulation in the cavity (65mm instead of 90 mm), 24"OC spacing (instead of 16"OC), a smaller empty air gap (16mm vs 25mm) and even worse, cross bracing was used to tie the studs together. So in a true "apples to apples" comparison, the metal would work out pretty much the same, or maybe with a slight advantage.

So yea, that's true: there's not much in it for metal studs compared to wood studs. They both work about the same.

- Stuart -

[Johnnie]

May I please be moved over to construction? I'm planning to go with the current smaller form, and most of my questions are starting to gravitate towards construction type issues. I'll also be starting plinking away at the outer shell before long. Mine's going to be yet one more of those slow go-ers, but hey! At least it's starting.

[Soundman2020]

May I please be moved over to construction?

Sure! .... Done!


- Stuart -

[Johnnie]

MosesKill 3.jpg

It's funny... I thought I was just gonna go with that... and now I'm second guessing myself. Starting to think about something like this instead.

Edit: BTW, I know I haven't correctly doubled that one wall to the lobby. The plan is ofc to double that.

[Soundman2020]

I thought I was just gonna go with that... and now I'm second guessing myself.

Happens to me all the time!

- Stuart -