Okay my 2c here too...
In home studios, in my experience, the number one problem is always clean power and avoiding interference from fluorescent lights etc. That's what really screws up the sounds and S/N ratio/causes problems. Solution: make sure you have as little gear behind that fuse as possible, definitely no coffee makers/any thermost controlled devices, A/C units, fridges, etc. but only music gear. Also use shielded/protected power strips/extension cords only.
2nd biggest problem is actually the gear itself; using a better soundcard than mediocre can boost your s/n ratio by 20-30db easy. Also using sub-par external gear like Behringer mixers etc. can wreak havoc with your sound. Always use a bare minimum of devices to get the signal to the DAW, in monitoring it's not _so_ important. But really, use a minimum of stuff, and use quality stuff only, and you may be surprised.
3rd biggest problem is the reflection from large hard surfaces, usually windows, if present, or way too confined space/small speakers that make it impossible to hear the low end correctly when mixing.
But in reality, IMO, the actual sonic response of the room and it's 'acousticity' only becomes an issue when using hypersensitive mics and far-miking drums and acoustic instruments. Really, I wouldn't sweat about it at all. These days it's usual to record everything like vocals in small booths and/or use shield screens to eliminate all reflections so you get no extra space in sound.
Of course acoustics can be important in big studios and getting that grand piano to sound just right, but if you're recording vocals, guitars etc. the acoustics are the very LAST thing you ever need to worry about. My suggestion: when all the power etc. issues are fine and you get a -90db S/N according to your DAW metering, then worry about it - and IMO the best thing you could do is add some very heavy curtains on the walls/over windows, wherever you can. My space has heavy curtains right behind my back, closing the recording space into a small box surrounded by curtains; that kills all the reflections but lets the bass sounds travel thru OK.
So...my view is that pondering about acoustics of the space is absolutely the last thing to worry about. Just make sure you have some soft sofas etc. there to soak up reflections and not a lot of bare walls/windows > heavy curtains. You'll be better than a-OK for acoustics needs. Again, I'm sorry if someone feels I'm being forward dissing good efforts to build good acoustics, but it's just that in reality it ain't important; actually it's just plain dumb to spend too much effort in it in most cases, and chances are you end up actually just making the room sound more unnatural than what you started with. Enough damping and a room big enough for bass frequencies to actually sound is good enough. I know platinum-selling rock albums recorded in log cabins or studio coffee rooms - and you'd never know that from the sounds.
(btw get a couple long mic cables and try recording in a tiled washroom for acoustic guitars too
p.s. 2 one thing that people also put too much weight on is 'just the right mic'; sure, I too have good AKG414 etc. mics but, in real life, I might just as well record a vocal using a '57 and it sounds just as damned good...a proper pop screen and correct distances etc. are more important than the best possible mic in a home studio, trust me on that one. You don't _need_ a top end mic unless you have top-end mic pres and and compressors and know how to coax the best out of that mic anyway.
I am hanging these on the walls and the ceiling. They are 3 inches thick (Rockwool).
