Seriously, probably around STC 40-42. It would be nice if two STC 33 items made for STC 66, but alas...
John, a very basic imperial test would be put a ghetto blaster in the control room, SLM at the doors, crank it to 90 dB with both doors open, close one door, measure, close the other door, ditto...
I did this once with a blaster and a refrigerator to see how good the magnetic seals were (I think I ended up testing the frig walls instead, worked out to 37 dB difference between door open, door closed)... Steve
Soooo, when a Musician dies, do they hear the white noise at the end of the tunnel??!? Hmmmm...
Well, I can verify that 2 sliders really do the trick. We've had ours installed the last few weeks, and the work great. About the only thing they won't stop is the really low end on a bass drum. Don't get me wrong, they'll knock the bass down significantly, but you're still gonna get some transfer.
I have strongly been considering using John`s ideas of sliding doors between my booths and my control room. I like the potential sight lines they offer.
What kind of doors are you all using? Are they standard sliding glass doors that one could get at home depot or are they super expensive acoustical doors?
I have strongly been considering using John`s ideas of sliding doors between my booths and my control room. I like the potential sight lines they offer.
What kind of doors are you all using? Are they standard sliding glass doors that one could get at home depot or are they super expensive acoustical doors?
check your door manufacturers locally - you may find that whilst they don't carry any acoustic doors in stock they may have one in the range. The doors at left bank were exactly that and were made in Brisbane to our size specs and transported down to us (70 miles or so)
My doors got put thru the stress-today. I had a friend of mine from a local death-metal act come out and wail on the kit... while the rest of his band stood in the control room and watched me close the sliders.... They were picking thier jaws up from the floor because they couldn't belive the difference. There was some VERY minor leakage, but overall, I'm totally blown away by the isolation... and these weren't even acoustic sliders. Hell, we picked one up off of a "damaged" rack and got a $200 discount... turns out it was just missing a handle. I love it when things get ecenomical!
wow...so I can really get away with solid "normal" sliding doors? Life is good...especially since my drum booth is not even connected to my control room...it is on the far end of the studio. Also...the other booths that will be connected are primarily for vox, and horns/strings
I can vouch for the effectiveness of garden variety doors as well. Mine are separated by a pretty good offset air space (20 - 36 inches); but the effect is pretty stunning.
wouldn't part of the problem be the STC rating of each individual door, not the rating of them combined?
Sure if you are only trying to reduce sound transmission between recording space and control room, but if you have a room inside a room, to reduce sound transmission to neighbours, wouldn't the doors become your weakest link?
ie you only need to build your walls to the same quality as your doors. If you built a wall with say, 2 layers of 16mm plasterboard and some green glue, much of this expense would be wasted as soon as you added sliding doors with an STC of 33 or similar? I am assuming this standard twin leaf design plus green glue offers at least 33 on its own. am I wrong?
I can't find anywhere that can tell me the stc of 16mm plasterboard, GG, 16mm plasterboard, alone. it all has another layer, maybe with an air gap.
