ᐅ Home Theater in Basement – Soundproofing

Lignotrend is definitely the luxury option here.
A proper floor construction combined with a drywall stud frame and a suspended/sprung ceiling will also work well.
Create about a 100 mm (4 inches) cavity at the exterior walls using either a timber or metal stud frame, insulate it with mineral wool, and then apply triple-layer sheathing. For the best results, use a mixed sheathing approach with Knauf Diamant 12.5 mm (0.5 inches) on the outside. Do something similar on the ceiling, additionally suspended or mounted on a spring rail system, depending on how much space you have above.
Room acoustics will also likely become a factor, so you may need to optimize the reverberation times as well.

MayrCh schrieb:

A proper floor construction combined with a drywall stud frame and a suspended/sprung ceiling will certainly work as well.

I have underfloor heating, and the entire basement is covered with tiles and skirting boards.
What exactly do you mean by the floor construction? I have to consider that the door opens inward and has a steel frame cast into the concrete.

MayrCh schrieb:

Create about a 100 mm (4 inch) cavity at the exterior walls using a wooden or metal stud frame, insulate it with mineral wool, then apply triple-layer drywall, for the best result use a combination including 12.5 mm (0.5 inch) Knauf Diamant boards on the outside.

Won’t the structure-borne sound be transmitted through the stud frame again? I suppose it won’t help much against bass frequencies?

MayrCh schrieb:

Something similar for the ceiling, additionally suspended or mounted on spring rails, depending on how much space you have above.

The room height is 2.4 m (7.9 ft).

MayrCh schrieb:

Room acoustics will definitely become an issue, you might need to optimize the reverberation times as well.

Sure, the detailed measurement and adjustment with absorbers and diffusers will come afterwards, but the absorbers can already be planned for the early reflections.

Kellerkino schrieb:
Isn’t structure-borne noise transmitted through the stud frame?

The stud frame must, of course, not create a direct structure-borne noise bridge to the exterior wall; otherwise, all efforts are wasted. You are essentially building a multi-layered wall. Ideally, it should have no structure-borne noise bridges and be connected using permanently elastic materials.

Kellerkino schrieb:
I have underfloor heating, and the entire basement is fitted with tiles and baseboards.

Is the screed laid continuously at the door or separated by a joint? Is this joint also permanently elastic in the tiles? Horizontal structure-borne noise transmission through the floor is generally less significant.

The screed and the tiles are permanently elastically separated from the entrance area... lucky break.

How do you build a wooden structure that has no vibration-transmitting connection to the wall?

I always think of the black rubber mats that are placed under a washing machine.

Kellerkino schrieb:
How do you build a timber frame structure that does not have a vibration-transmitting connection to the wall?

How do you install a drywall partition?

MayrCh schrieb:
How do you build a drywall partition?

I've never done it before. There's always a first time, and it shouldn't be that difficult.