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Please check my new topic in the acoustic forum http://www.johnlsayers.com/phpBB2/viewtopic.php?t=10467 this thread is dead, do not replay in this page please. Overview: Finished converted 2 car garage for Drums/ band Rehearsals/Tracking Isolation is good enough. Goals 1) Reverberation time at about 0.5 sec. 2) Diminishing the intensity of early reflections uniformly all around the room. 3) About 85% to 100% coverage for acoustic treatment. (sorry I don't like any flat hard drywall around me) it's kind like small and loud in here.... Questions: 1) I would like to achieve the goals above but I need to keep it very simple.. it's just a garage, how? 2) (see images), the last layer of drywall toward the studio, (walls only), does it help for Isolation ? absorb some extra bass frequencies? or it worsen mode and resonances and should be removed to match the ceiling? Options: 1) I'm open to modifying the interior shape/dimension of the room if suggested as an acoustical treatment. Construction details: See images, "The density of the high density rigid mineral wool is 0.61 x sqf. (the formula is 0.61 x 12 divided 5/8" thickness.)" rigid acoustic tile material. Here just an example of the the RT60 and absorption coefficients of the materials, however I never measured the reverberation time or tested the material. 5/8 Drywall on 2x4 studs 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 0.29, 0.11, 0.05, 0.05, 0.07, 0.09 concrete floor, 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 0.02 0.01 0.01 0.01 0.02 0.01 Rigid high density mineral wool (acoustical tile material) mounted without airspace : (NRC 0.45) 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 0.08 0.27 0.75 0. 83 0.71 0.62 Reverberation time of the room originally, without mineral wool: 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 0.45 sec 1.0 sec 1.7 sec 2.0 sec 1.6 sec 1.4 sec. Reverberation time with mineral wool exposed on the ceiling and behind the additional 5/8 drywall ( see images): 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 0.45 sec 0.8 sec 0.7 sec 0.6sec 0.5sec 0.5sec Budget: Is low, I need to keep things simple, I already have some constructions and acoustic material that is usable. I can afford about $400.00.

I didn't forget, but yor project is complicated and I haven't finished suggestions. I'm working on it. Arthur Noxon www.tubetrap.com

Walls: You have a triple leaf. Do not put any insulation between the two layers of drywall. Do put insulation in the cavity. Roof: Put insulation in the cavity. Andre

arthur noxon wrote:

I didn't forget, but yor project is complicated and I haven't finished suggestions. I'm working on it. Arthur Noxon, www.tubetrap.com

Thank you Mr Noxon, I'm building some sonotubes in the main time :wink:

AVare wrote:

Walls: You have a triple leaf. Do not put any insulation between the two layers of drywall. Do put insulation in the cavity. Roof: Put insulation in the cavity. Andre

thanks Andre, sorry probably my description is confusing... construction is already done. This are my existing walls, yea .. an unconventional triple leaf I know. more picks... my door