Multi-purpose Music/Home Theater/Recording Studio

[goodwater]

No, it's the space above the two storage that I'm going to fill with Rockwool for using as bass traps.

The soffits are filled with wool but closed with 5/8 drywall to soundproof the air ducts.

Stef

[gullfo]

if you use a silencer on the wall penetrations for the supply and return, you don't need to soundproof the ducts. and if they're flex duct, even better. the soffits (if they were soft) would absorb a lot, and adding some hard plates etc along the sides and/or bottom to keep things from being completely flat, you would get a really good benefit...

even hard ducts, fully damped, would be ok. the key for the air system is low velocity and low noise vents. silencers for penetration between spaces to attenuate inter-room sound transfers.

[goodwater]

Here's how the ducts are installed:

In the left soffit, there's the return grille preceded by approximately 3 feet of acoustical flex and approximately 2 feet of hard duct at the wall outlet.

In the right soffit, there are 3 supply grilles (blue = hard, green = flex). At the wall exit, there is a Y then 3 feet of acoustic flex before the first grille. The hard duct continues about 4 feet to the second Y then about 6 feet of flex before the second grille. The hard duct continues about 5 feet then about 8 feet of flex before the third grille.

duct4.JPG (47 KiB) Viewed 2 times

duct4.JPG (47 KiB) Viewed 2 times

Acoustic flexible ducts are used here to reduce the velocity (and therefore the noise) before reaching the grilles.
I filled the soffits with fiberglass.

Source of the post the soffits (if they were soft) would absorb a lot

Q1: Are you saying I should cover the front of the soffits with fabric (the side where the grilles are) instead of drywall?
(For the bottom, I need to use drywall to support the recessed lights and drivers)

Source of the post and adding some hard plates etc along the sides and/or bottom to keep things from being completely flat

Q2: Are you saying I should put drywall only where there is a grill or light, and put fabric for the rest of the soffits?

Stef