my goals are:
best SQ through acoustic treatment
and if possible, prevention of bass from going to the next room.
Howdy:
Suppressing noise transmission througyh the walls and interior room acoustic treatment are roads that by and large never intersect.
For some ideas on how to beef up a cc block wall here is some data - focus on LF transmission as this is typically the defining weakness in your circumstances.
http://irc.nrc-cnrc.gc.ca/pubs/ctus/13_e.html
... and consider flanking paths [doors, windows, HVAC system], Building high isolation walls with standard doors in them doesn't do much good in the end.
guidelines like:
1) treatment on first reflection points ... how thick? (I plan on using 2" thick high density rockwool)
2) if my floors are hardwood on concrete slab ... what do I do with the ceiling? (I can put an area rug and acoustic treatments on the floor hitting the first reflection points)
3) what do I do with the rear wall? full absorption? or only on the first reflection points?
4) front wall ... I read somewhere to put full absorption on the front walls, is this correct?
5) bass trapping ... instead of "superchunk" style of corner treatments, I intend to put 2" thick rockwool 24" width along ALL corners (wall to wall, ceiling to wall, floor to wall - imagine belts horizontally top and bottom of all walls, and vertical lines on all corners) will this make the room too dead?
1) Consider a broadband approach.. us fewer panels, but make thenm all thick. This will yield a more balance absorption curve and help you avoid over treatment. It will also save money.
2) An absorptive element efficient all the way down into the mid-band, as woudl be typically used for early reflection control would make for an odd floor covering [oriental rug over 2" mineral fiber?]. Most folks treat the walls and ceiling for early reflections and don't worry about the floor [early reflections aren't bad - just as the existance of modal resonances isn't bad.. its just that small rooms typically expose a listener to more of these things than one might like. Its about moderation and control, not genocide.
3) Given the room size I might consider a diffusive treatment.. maybe a nice hardwood veneer poly? See the link.. scroll to the bottom:
http://forum.studiotips.com/viewtopic.php?t=48
4) Front wall absorption is found by many to be disproportionally beneficial... but covering every square inch might be a bit overboard, especially if you do a fully absorptive ceiling.
5) 2" thick is too thin... you'll suck the highs out of the room and not even touch the lows if all your treatments are 2"... 4" minimum thickness on panels [if you opt to not do SuperChunks]. In fact make em all 4" - see #1 above.
Good luck.
