Peter the Greek

I like the idea from a mass perspective. Not sure what a HVAC guy would think regarding maintenance. Regarding the floor. I put down a layer of a product called Angel Step that Acoustica supply. Then chip board on top of that. If I had the space (height) I'd have down a second layer with GG in between. It felt good to walk on - sort of springy

LOL, I suspect you might be right...I've not seen it though.

Regarding multiple walls, see triple leaf effect https://www.soundproofingcompany.com/soundproofing101/triple-leaf-effect/ Can be avoided by having the room layer porous. I used peg board wherever I could if I needed to bring walls out to certain levels. But really no point. Just clip and channel the whole thing, then deal with the bass then....as I say just put a riser trap in...if my old room was big enough, this one Certainly is

Gee.....I found that pretty stale....disappointing really. I dont know why its rated so highly on IMDB (8.4)

We don't watch a lot of TV, but was guttered when The Good Wife finished. I was quite impressed with how well The Good Fight took over, even without Alicia. (Flame suit on) I'd rank the two shows possibly second favourite of all time, behind Breaking Bad

@Silent Screamer Obviously you have two opposing opinions being shared - "all or nothing" v "very minimal or nothing at all" If you're on the fence, I'd suggest you go and find a properly structurally isolated room that has been appropriately treated for bass. I had zero issues in mine and I'm aware of at least two other rooms of SNA members who have similar results. Each does however use a bass trap riser and in the case of PeterM's, a huge (read freaking enormous) ceiling trap and a helmholtz trap in the back. There are solutions to the "stiff walls" issue. Let me put it another way, none of the "world class" theater builders out there do any half measures when it comes to soundproofing, as I keep saying, its about keeping it out as opposed to keeping it in. Go and sit in a low ambient room and just listen to the silence, its a special thing.

@explorer2203 Any progress updates?

Where is the door going? I should say doors, you'll want double communicating fire doors. Or do what I did and have a little isolated "air lock" walk way/hall, with a door at each end

Are they filling that besser block wall with concrete, or just mortar to hold it together. If the latter, it'll flank like a *****. Even if its solid concrete, its not isolated from the rest of the structure. I'd put money on it flanking bass somewhere into the house

It's been years since I looked at it, but I wasn't aware the density of soundchek was higher than firechek? Density is all that matters, the rest is marketing BS. When I looked into it last, BCG's fire rated board was the most dense on the market.

@Tweaky https://www.soundproofingcompany.com/soundproofing101/the-dead-vent/ https://www.soundproofingcompany.com/soundproofing-articles/how-can-i-ventilate-a-sealed-soundproof-room/ Then you need over sized supplies and returns so you can't hear the air flow. 200 fpm at the vent is supposed to be the benchmark

Doesn't work, in fact detracts. Isolation, mass, damping in that order. Spray foam does none of these

@superaaaa any updates? Got things calibrated yet?

Read the website, it explains it all.

Its always an issue. Mass will get you much further....you need to consider what frequencies. STC is > 125hz.....not that hard to stop. Read here https://www.soundproofingcompany.com/soundproofing101/understanding-stc/