wall buzzing @~56hz

b05q · 7th April 2008, 11:52 PM

OK. so i'm in a horrible room, 11' x 11' x 8' in an old house (built in the 60s maybe). but hey, at least i've got a room, it could be worse.

so i've stuffed a couple of 12-packs of 703 in there (actually i've got 2 sheets left):

2 - 4'x2'x6" traps behind the monitors
2 - 4'x2'x4" traps centered on the rear wall
front corners have 7' of superchunks (17"x24" triangles), so 42 triangles - i actually added a foot to each side since the photos
rear corners have 1' of superchunks, 6 triangles on the top.

also since the photos i've boarded and sealed up the window pretty good, with MDF (at least 3 layers of 1/2" board everywhere) and 'weather stripping' foam tape.

i've also sealed the door on the left side of the rear wall (not the one next to the window, that goes to a closet), except for the bottom, need to get my hands on a hack saw to trim the door-bottom thing i got for it.

and there's auralex on the side walls at the early reflection points.

the room sounds WAY better. there are still peaks at ~55 and ~110 hz (i guess that's the standing freq?) but they aren't as pronounced, and the nasty, phasy junk in the valleys above and below them are gone.

the thing is, a strong tone at 55-56 hz makes the wall behind the speakers buzz. like a poorly made box for a sub in a car. if i put my hand on the wall it stops, and it take a few seconds to get going again after removing my hand.

is there anything i can do to reduce these vibrations?

my hunch is this is more of a sound-proofing type problem than an acoustical treatment deal, but i've got 2 more sheets of 703, i was planning to make a standard 4'x2'x4" trap and hang it on the frontwall-ceiling edge, should i do something else with these?

as always, thanks to the experts on here who help noobians like me.

Ethan Winer · 8th April 2008, 07:51 PM

I'm not much of a construction guy, but I have to think gluing a second layer of sheet rock to the existing sheet rock will solve this or at least help.

--Ethan

b05q · 9th April 2008, 03:09 AM

yeah, was afraid the answer was going to be along those lines. it's only noticeable when a sine-like bass sound, down there in the 50s, is the dominant element of the mix, and i crank it to 11.

so i guess i'll just have to go easy on the ear-bleeding, probably for the best anyway. (not my house being one of many reasons).

Disjointed · 9th April 2008, 02:07 PM

the buzzing is most likely caused by laziness/cheapness... ;) (not on your part)

chances are the original contractor/homeowner - whoever put the drywall up, slacked

ive been in houses where they only attached the drywall at top and bottom, and left the middle floating.... sounds like you have a similar situation..

id recommend adding more screws to the drywall- find the studs and especially in the areas where your hand will stop the buzzing, add more screws.. patch, paint..

cheap easy should work fix

gl

Glenn Kuras · 9th April 2008, 06:23 PM

Quote:

Originally Posted by Disjointed

the buzzing is most likely caused by laziness/cheapness... ;) (not on your part)

chances are the original contractor/homeowner - whoever put the drywall up, slacked

ive been in houses where they only attached the drywall at top and bottom, and left the middle floating.... sounds like you have a similar situation..

id recommend adding more screws to the drywall- find the studs and especially in the areas where your hand will stop the buzzing, add more screws.. patch, paint..

cheap easy should work fix

gl

Yea with Disjointed on this one. Seeing how you are from Atlanta I am not surprised to hear about workmanship like this.
Got to love those Atlanta home builders.

Glenn

dykstraster@gmai · 9th April 2008, 06:32 PM

If more screws don't work, maybe filling the stud cavities with spray insulation? I'd think screws would do it though.

b05q · 10th April 2008, 08:59 PM

that's exactly what it feels like when i press my hand on it, like i'm pushing the middle in. and then that's why it takes a second for it to return, the drywall is slow to unbend.

i'll try putting some screws in.

thanks fellas!

b05q · 10th April 2008, 09:02 PM

Quote:

Originally Posted by Glenn Kuras

Yea with Disjointed on this one. Seeing how you are from Atlanta I am not surprised to hear about workmanship like this.
Got to love those Atlanta home builders.

yeah, right. this house is a total POS.

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7th April 2008, 11:52 PM	#1
b05q Gear Head Join Date: Feb 2008 Location: TRAPLANTA Posts: 41	wall buzzing @~56hz OK. so i'm in a horrible room, 11' x 11' x 8' in an old house (built in the 60s maybe). but hey, at least i've got a room, it could be worse. so i've stuffed a couple of 12-packs of 703 in there (actually i've got 2 sheets left): 2 - 4'x2'x6" traps behind the monitors 2 - 4'x2'x4" traps centered on the rear wall front corners have 7' of superchunks (17"x24" triangles), so 42 triangles - i actually added a foot to each side since the photos rear corners have 1' of superchunks, 6 triangles on the top. also since the photos i've boarded and sealed up the window pretty good, with MDF (at least 3 layers of 1/2" board everywhere) and 'weather stripping' foam tape. i've also sealed the door on the left side of the rear wall (not the one next to the window, that goes to a closet), except for the bottom, need to get my hands on a hack saw to trim the door-bottom thing i got for it. and there's auralex on the side walls at the early reflection points. the room sounds WAY better. there are still peaks at ~55 and ~110 hz (i guess that's the standing freq?) but they aren't as pronounced, and the nasty, phasy junk in the valleys above and below them are gone. the thing is, a strong tone at 55-56 hz makes the wall behind the speakers buzz. like a poorly made box for a sub in a car. if i put my hand on the wall it stops, and it take a few seconds to get going again after removing my hand. is there anything i can do to reduce these vibrations? my hunch is this is more of a sound-proofing type problem than an acoustical treatment deal, but i've got 2 more sheets of 703, i was planning to make a standard 4'x2'x4" trap and hang it on the frontwall-ceiling edge, should i do something else with these? as always, thanks to the experts on here who help noobians like me. Attached Thumbnails

8th April 2008, 07:51 PM	#2
Ethan Winer Lives for gear Join Date: Oct 2002 Location: New Milford, CT, USA Posts: 4,834	I'm not much of a construction guy, but I have to think gluing a second layer of sheet rock to the existing sheet rock will solve this or at least help. --Ethan __________________ www.realtraps.com The acoustic treatment experts ----------------------- Amazing Telecaster guitar video

9th April 2008, 06:32 PM	#6
dykstraster@gmai Lives for gear Join Date: Jan 2008 Location: Midwest Posts: 899	If more screws don't work, maybe filling the stud cavities with spray insulation? I'd think screws would do it though. __________________ "phantom power doesn't make your voice sound spooky" ME http://www.myspace.com/dykstra MY BAND http://www.myspace.com/revisiontext OUR STUDIO http://www.gearslutz.com/board/bass-...-progress.html

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9th April 2008, 03:09 AM	#3
b05q Gear Head Join Date: Feb 2008 Location: TRAPLANTA Posts: 41	yeah, was afraid the answer was going to be along those lines. it's only noticeable when a sine-like bass sound, down there in the 50s, is the dominant element of the mix, and i crank it to 11. so i guess i'll just have to go easy on the ear-bleeding, probably for the best anyway. (not my house being one of many reasons).

9th April 2008, 02:07 PM	#4
Disjointed Gear addict Join Date: Nov 2006 Location: right behind you!! Posts: 356	the buzzing is most likely caused by laziness/cheapness... ;) (not on your part) chances are the original contractor/homeowner - whoever put the drywall up, slacked ive been in houses where they only attached the drywall at top and bottom, and left the middle floating.... sounds like you have a similar situation.. id recommend adding more screws to the drywall- find the studs and especially in the areas where your hand will stop the buzzing, add more screws.. patch, paint.. cheap easy should work fix gl

10th April 2008, 08:59 PM	#7
b05q Gear Head Join Date: Feb 2008 Location: TRAPLANTA Posts: 41	that's exactly what it feels like when i press my hand on it, like i'm pushing the middle in. and then that's why it takes a second for it to return, the drywall is slow to unbend. i'll try putting some screws in. thanks fellas!