GIK Vicoustic and others

I’ve been a GIK customer for several years. As expressed to others on the Gon, they had QC issues pre pandemic. For instance, poor build quality; peeling surfaces; sloppy folding of fabrics; and rectangular enclosures with obtuse angles. They were responsive to my complaints, and the replacements met expectations. I’d recommend them if your expectations are lowered for speed and quality. 

As well stated above, you are doomed without sufficient bass trapping. That’s where the $ needs to go first. All 4 corners 12-16” diameter for the lowest fundamentals and to tame the standing waves, eliminate nulls. 

If you are handy and want to DIY some acoustic panels here is an excellent video:

IMO if you have a limited budget for listening room sound treatment you will be better off spending your funds on in-room treatments (absorbers, diffusers, bass traps) than on extra layers of drywall and insulation. I've heard several standard construction listening rooms that sound great, including mine, and if you sell your house someday you will not not recover the audio related construction expense.

@ei001h 

"why double dry wall if you’re already using rock wool ? Where did you instal spray foam ? Why is glue important?"

I live in a quiet  neighborhood, but there are still neighbors with leave blowers, chain saws etc and the ever present AC compressors.
So I double studded the room which left enough room for spray foam (do not do this your self) and rockwool.  Then double "Quiet Rock" dry wall with green glue in the middle. Makes for rather wide window sills!

To answer your questions directly: I made the room as sound-proof as possible.
The spray foam and rock wool are admittedly overkill, but I had to have some insulation as it's an above ground room on a slab.

Order of events was: double framing then spray foam then rockwool then Quiet Rock then Green glue then quiet rock.

Green Glue may or may not be important to you...my system can easily overload the room so I'm throwing the kitchen sink at SOUND PROOFING.  Not to be confused with acoustic treatments. 

To be clear: my goal was to make the room impervious to external noise, and secondarily to music escaping.  The room is dead quiet which IMO will raise the level of any set-up you end-up with.  

You're on the right path.

Regards,
barts

@8th-note 

I agree with your sentiment...but this is not a one-size-fits-all arrangement.
This (essentially) is what we signed up for!  If the listening room doesn't require
aggressive SOUND-PROOFING then your good.

If external noise invasion is not present (it's virtually not in my case) and there's no issue with music escaping into the internal environ you are good to go and your advice should be heeded.

Regards,
barts