Bass & Gypsum Board walls

mcp · 13th September 2003, 05:12 AM

Has anyone experienced odd bass reproduction in rooms with walls constructed with Gypsum Boards? The lower frq sounds muddled. Put the same speakers in brick walls or glass walls, muddleness disappears. Could it be that the Gypsum Board walls are flexing?

Da5id4Vz · 13th September 2003, 05:24 AM

Dry wall definitely reacts with low frequency sound. Single sheet per side construction is also prone to reradiating. Filling the cavity with insulation doesn’t do much do dampen LF reradiating.

Thicker sheets of drywall help, closer spacing on the studs, heavier gage studs if they are metal, and duplicate layers of sheet rock all help immensely.

For a couple of projects I worked on Architects and Acousticians recommended 3 layers of gypsum screwed and glued with staggered seems. That was just for the inside of the rooms.

-Dave

mcp · 13th September 2003, 05:37 AM

Thanks for your insight Dave. I thought my ears were playing tricks on me. I brought this up because many years ago, I did some installation work in board rooms of corporations and this was what I encountered. My friends thought I was "nutty".

13th September 2003, 05:12 AM	#1
mcp diyAudio Member Join Date: Jul 2002 Location: Vacation Land	Bass & Gypsum Board walls Has anyone experienced odd bass reproduction in rooms with walls constructed with Gypsum Boards? The lower frq sounds muddled. Put the same speakers in brick walls or glass walls, muddleness disappears. Could it be that the Gypsum Board walls are flexing? __________________ Michael Chua

13th September 2003, 05:37 AM	#3
mcp diyAudio Member Join Date: Jul 2002 Location: Vacation Land	Thanks for your insight Dave. I thought my ears were playing tricks on me. I brought this up because many years ago, I did some installation work in board rooms of corporations and this was what I encountered. My friends thought I was "nutty". __________________ Michael Chua

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13th September 2003, 05:24 AM	#2
Da5id4Vz diyAudio Member Join Date: Feb 2003 Location: lost in america...	Dry wall definitely reacts with low frequency sound. Single sheet per side construction is also prone to reradiating. Filling the cavity with insulation doesn’t do much do dampen LF reradiating. Thicker sheets of drywall help, closer spacing on the studs, heavier gage studs if they are metal, and duplicate layers of sheet rock all help immensely. For a couple of projects I worked on Architects and Acousticians recommended 3 layers of gypsum screwed and glued with staggered seems. That was just for the inside of the rooms. -Dave

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