I already have Hann-level soundproofing, and it's not enough.
I listen loud.
I need beefier soundproofing. Budget is unlimited in term of soundproofing. I'm starting from zero. Bare lot.
What I have:
I have 32 subwoofers with 100kW of FP14k's pushing them.
My current room is a dedicated building, 75ft away from the main house, on a 3ft thick reinforced concrete slab.
Room-in-room design consisting of 1inch thick painted cedar, two 5/8's OSB, 2x4 with pink insulation, 1" air gap, 2x4 with SnS, vb
, hat track, soundboard, two layers of 5/8's FR DW with GG.
3.5" average acoustical treatments (SnS and acoustical foam behind AT fabric on all 5 boundaries.)
No windows. Dual exterior doors both with weather stripping.
No ducts/fresh air supply (on purpose).
This is STILL not enough.
This blocks all of the treble, and pretty much all frequencies above 200hz are blocked.
Even some of the bass is blocked.
But I have to keep my SPL to THX level in order to not disturb the entire block.
When I turn it up to half-power my backyard STILL sounds like a train is passing by (all ULF).
Current noisefloor is somewhere around -15 and -6db.
Getting about 115db of attenuation above 200hz, and a whole lot less in the 1-30hz region.
To make your task harder, since I will also have more space in HT v2 I will be making bigger/beefier speakers and subs too, beyond what I already have! (More 24" subs etc.)
Lots and lots of bass!
What I need:
I don't know! (That's why I'm here, asking this...)
All I know, is that it needs to be beefier/more.
As mentioned the soundproofing budget this time will be unlimited because this will be my 2nd and final HT.
I'm thinking 15ft deep underground bunker, 1ft thick concrete on all 6 sides. (12ft height inside.)
Using the entire width of the theater to separate the doors (solid metal bunker doors? 500lbs, 2000lbs? Multi-layer composite?)
Projector-booth/amp-rack/popcorn-maker also contained in this walk way.
This forms the outer shell.
Inner shell: undecided.
Two rows, 5 seats each.
Exact dimensions are undecided but height will be 9-12ft.
Screen size: undecided
I would like fresh air intake/exhaust this time (who wouldn't?
), but I specifically excluded it last time because I already knew that soundproofing would be a limiting factor; and STILL was.
Basically I want to put my system in Hann's garage, but bury it underground, and well away from the house!
Starting from zero/bare lot.
What do I have to do to block 194db of bass?
Soundproofing-budget is unlimited (whatever it takes, I will do!)