Flutter Echo - Argh.

seamus james · 29th August 2008, 05:33 AM

Uploads weren't working so I put a picture of what I'm working with on my website instead. Here it is: http://www.fredandlunchbox.com/images/stitch.jpg

I'm kind of winging it in terms of treatment. I've read some stuff on here, looked at some other web sites (including Glenn's), and now I'm trying to flatten my room out. Right now, I have two 2'x2'x4" high density foam panels behind my monitors (which are sitting at the 38% mark), as well as a bunch of 3" auarlex wedges on the two other walls at early reflection points. I don't have anything on the back wall yet (I was thinking bass traps/diffusors).

Problem is, I have a pretty solid flutter echo when I turn everything off and clap. It seems like it's coming from the wall behind my mixer. I used to have a bad one on the left wall (see picture below), but when I put up the foam, that seemed to help. Any ideas?

I know, I need bass traps. I'm looking for mineral wool/fiberglass in my area. I'm planning on trapping the back corners and the ceiling/wall corners around the whole room. (Incidentally, I found 2lb compressed fiberglass for real cheap - if I doubled it up, would it work?). Will it affect the flutter?

peeder · 29th August 2008, 05:55 AM

I found the Auralex TFusors work well on flutter echo for relatively cheap. Even the QFusors work quite well although not as deep into the low mids (though they are fragile).

Absorption will work but it will deaden the room unnaturally at some point.

You will get flutter any time there are parallel smooth refelective surfaces to bounce between in a smallish space. Bust em up!

Glenn Kuras · 29th August 2008, 11:33 AM

Quote:

Problem is, I have a pretty solid flutter echo when I turn everything off and clap. It seems like it's coming from the wall behind my mixer. I used to have a bad one on the left wall (see picture below), but when I put up the foam, that seemed to help. Any ideas?

In that area you can use diffusion or absorption to tame it. I would though, play a clap though the monitors and see what you hear from the mix spot. That would be the way to hear is going on during monitoring.

All and all though I would focus on the bass trapping first. That is the biggest problem right now.

Quote:

I found 2lb compressed fiberglass for real cheap - if I doubled it up, would it work?). Will it affect the flutter?

Sure just make it about 2" thick.

Glenn

andrebrito · 29th August 2008, 12:21 PM

Place more absorption/diffusion on the ceiling and back wall

seamus james · 29th August 2008, 03:29 PM

Sweet. Thanks for the help guys. I think I'll build some QRD's this weekend and see if that helps.

andrebrito · 29th August 2008, 06:33 PM

Sure it will ! Depending on the number of QRDs used of course

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29th August 2008, 05:33 AM	#1
seamus james Gear Head Join Date: Apr 2008 Posts: 34	Flutter Echo - Argh. Uploads weren't working so I put a picture of what I'm working with on my website instead. Here it is: http://www.fredandlunchbox.com/images/stitch.jpg I'm kind of winging it in terms of treatment. I've read some stuff on here, looked at some other web sites (including Glenn's), and now I'm trying to flatten my room out. Right now, I have two 2'x2'x4" high density foam panels behind my monitors (which are sitting at the 38% mark), as well as a bunch of 3" auarlex wedges on the two other walls at early reflection points. I don't have anything on the back wall yet (I was thinking bass traps/diffusors). Problem is, I have a pretty solid flutter echo when I turn everything off and clap. It seems like it's coming from the wall behind my mixer. I used to have a bad one on the left wall (see picture below), but when I put up the foam, that seemed to help. Any ideas? I know, I need bass traps. I'm looking for mineral wool/fiberglass in my area. I'm planning on trapping the back corners and the ceiling/wall corners around the whole room. (Incidentally, I found 2lb compressed fiberglass for real cheap - if I doubled it up, would it work?). Will it affect the flutter?

29th August 2008, 12:21 PM	#4
andrebrito Gear addict Join Date: Jan 2007 Location: London Posts: 344	Place more absorption/diffusion on the ceiling and back wall __________________ Studio Design, Home Cinema/Studios Assistance, Large Room Acoustics projects - UK and Portugal. Online Consulting for the rest of the world We also sell acoustical diffusers at affordable prices, starting at 70 € / piece each ! http://www.onlineacoustics.com Music - http://www.myspace.com/spinous

29th August 2008, 06:33 PM	#6
andrebrito Gear addict Join Date: Jan 2007 Location: London Posts: 344	Sure it will ! Depending on the number of QRDs used of course __________________ Studio Design, Home Cinema/Studios Assistance, Large Room Acoustics projects - UK and Portugal. Online Consulting for the rest of the world We also sell acoustical diffusers at affordable prices, starting at 70 € / piece each ! http://www.onlineacoustics.com Music - http://www.myspace.com/spinous

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29th August 2008, 05:55 AM	#2
peeder Lives for gear Join Date: Aug 2006 Location: No longer participating here. Posts: 6,742	I found the Auralex TFusors work well on flutter echo for relatively cheap. Even the QFusors work quite well although not as deep into the low mids (though they are fragile). Absorption will work but it will deaden the room unnaturally at some point. You will get flutter any time there are parallel smooth refelective surfaces to bounce between in a smallish space. Bust em up!

29th August 2008, 03:29 PM	#5
seamus james Gear Head Join Date: Apr 2008 Posts: 34	Sweet. Thanks for the help guys. I think I'll build some QRD's this weekend and see if that helps.