ok, 70hz = roughly a 16ft waveform, and its destroying my room!

sleeper1400 · 31st March 2010

i have a 70hz build up in a corner.

i of course have my own ideas, but i feel like im in need of "of the top of your head" solutions.

absorption, diffusion, both?

would a 6 pack of 703 solve the issue?

thanks

Bubbagump · 31st March 2010

Diffusion is certainly not what you want. Absorption all the way. A 6 pack of 703 is certainly a move in the right direction, but until you have it installed it will be tough to tell how much it will do. Typically it takes a good amount of mass and surface area coverage to deal with the low end, so don't be surprised if the 2 or 3 traps you can make out of six pieces is just a start.

johndykstra · 31st March 2010

perhaps morebass will come chime in.

What are the room's dimensions?

sleeper1400 · 31st March 2010

Quote:

Originally Posted by Bubbagump

Diffusion is certainly not what you want. Absorption all the way. A 6 pack of 703 is certainly a move in the right direction, but until you have it installed it will be tough to tell how much it will do. Typically it takes a good amount of mass and surface area coverage to deal with the low end, so don't be surprised if the 2 or 3 traps you can make out of six pieces is just a start.

bass
waht about one big corner trap as suggested in Steven P. Helm: DIY Bass Traps

johndykstra · 31st March 2010

with dimensions we can at least figure out what axis is most likely to cause such a mode, and treat the right corners. If it's a height mode, wall corners won't do as much as ceiling/wall corners.

Bubbagump · 31st March 2010

Quote:

Originally Posted by sleeper1400

bass
waht about one big corner trap as suggested in Steven P. Helm: DIY Bass Traps

Again, that is a help... a good starting place. However, you need coverage too. One thick trap is not as effective as many thinner traps. (Though of course lots of thick traps are better than the same number of thinner traps.) I just want to set your expectations here. One trap, be it a panel or super chunk style, likely will not fix everything. Be prepared to put in multiple traps. Though, one trap will help.

Glenn Kuras · 31st March 2010

The simple answer is YES 4", 6" or fill the corner with rigid fiberglass or mineral wool, floor to ceiling will go a long way to solving a problem.

sleeper1400 · 31st March 2010

thanks.

looks like ill give it a try. the increase of 70hz is probably 5 or so Db.

it sounds great actually, but its got to go. so the room will even out.

ciro · 31st March 2010

At least 6" of rockwool/fiberglass or superchunks in the corners will take care of the decay below 80 hz (IME). But peaks or nulls in this frequencie may have other culprits (like untreated ceiling , rear wall...)
For all these places, I´d go for with no less than 6" plus 2" or 4" air gap - the thicker the better)

Ciro

westlake79 · 31st March 2010

I might also recommend a cheap/effective answer - a stack of fiberglass rolls. You can put a curtain in front of them or cover them up with fabric/frame. I just had a significant improvement with this stuff at very low frequencies.

I don't know the dimensions of your room but the rear wall/ceiling corner was a killer for me.

Here's the before and after graph, check out what this stuff did to the severe 70Hz null I had: (green is before traps)

31st March 2010	#1
sleeper1400 Lives for gear Joined: Mar 2008 Location: ypsilanti Posts: 1,255 Thread Starter	ok, 70hz = roughly a 16ft waveform, and its destroying my room! i have a 70hz build up in a corner. i of course have my own ideas, but i feel like im in need of "of the top of your head" solutions. absorption, diffusion, both? would a 6 pack of 703 solve the issue? thanks __________________ Neither the Beatles, nor Stevie Wonder had Protools.... maybe you just suck. .- overheard in a session

31st March 2010	#5
johndykstra Lives for gear Joined: Jan 2008 Location: Midwest Posts: 4,580	with dimensions we can at least figure out what axis is most likely to cause such a mode, and treat the right corners. If it's a height mode, wall corners won't do as much as ceiling/wall corners. __________________ phantom power doesn't make your voice sound spooky

31st March 2010	#7
Glenn Kuras Gear Guru Joined: Jul 2005 Location: Atlanta, GA Posts: 11,995	The simple answer is YES 4", 6" or fill the corner with rigid fiberglass or mineral wool, floor to ceiling will go a long way to solving a problem. __________________ Glenn Kuras GIK Acoustics USA GIK Acoustics Europe 770 986 2789 (USA) +44 (0) 20 7558 8976 (UK) See the NEW Scopus Tuned Trap

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31st March 2010	#2
Bubbagump Gear addict Joined: Mar 2007 Location: Columbus, Ohio Posts: 445	Diffusion is certainly not what you want. Absorption all the way. A 6 pack of 703 is certainly a move in the right direction, but until you have it installed it will be tough to tell how much it will do. Typically it takes a good amount of mass and surface area coverage to deal with the low end, so don't be surprised if the 2 or 3 traps you can make out of six pieces is just a start.

31st March 2010	#9
ciro Lives for gear Joined: Feb 2009 Location: Brasil Posts: 613	At least 6" of rockwool/fiberglass or superchunks in the corners will take care of the decay below 80 hz (IME). But peaks or nulls in this frequencie may have other culprits (like untreated ceiling , rear wall...) For all these places, I´d go for with no less than 6" plus 2" or 4" air gap - the thicker the better) Ciro

31st March 2010	#10
westlake79 Gear interested Joined: Apr 2009 Posts: 9	I might also recommend a cheap/effective answer - a stack of fiberglass rolls. You can put a curtain in front of them or cover them up with fabric/frame. I just had a significant improvement with this stuff at very low frequencies. I don't know the dimensions of your room but the rear wall/ceiling corner was a killer for me. Here's the before and after graph, check out what this stuff did to the severe 70Hz null I had: (green is before traps)