2'x4' panels.. other sizes effective?

  • Thread starter Thread starter ecstasteve
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Ethan Winer said:
Hopefully not too much information:

Acoustics FAQ
RealTraps Articles
RealTraps Videos

Enjoy! :D

--Ethan
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Seen them all Ethan. hahaha. I know how it works, but was asking why placing flat on the wall in the corner works. It wouldn't really work as good as across the corner, or superchunks. Only 4" compared to about 16"(including air-gap) for across, or 12" for superchunk. It takes up more of the wall at the corner though. Anyway, i think my drawing explained ok. Was it correct(but basic)?
 
2 panels intersecting in the corner still allows much of the benefit - it just doesn't reach as low as effectively.

Bryan
 
pandamonk said:
was asking why placing flat on the wall in the corner works.
Click to expand...

It works simply because you're putting absorption in the corner where bass collects. As Bryan said, it may not work as well as straddling or filling a corner. It works even better flat on the walls with an air space. With an air space, I imagine two panels will be even better than one panel straddling the same corner because there's more total absorbing surface. Of course, I know you know all this! :D

--Ethan
 
Ethan Winer said:
It works simply because you're putting absorption in the corner where bass collects. As Bryan said, it may not work as well as straddling or filling a corner. It works even better flat on the walls with an air space. With an air space, I imagine two panels will be even better than one panel straddling the same corner because there's more total absorbing surface. Of course, I know you know all this! :D

--Ethan
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Wouldn't it have to be a reasonable air-space though, like 4" or more to equal straddeling/filling?

Glad you know i know :p:D
 
Pretty much - yes. 4" with a 4" gap starts to take up a lot of space, actually more than just making chunks or straddling a panel.

Bryan
 
pandamonk said:
Wouldn't it have to be a reasonable air-space though, like 4" or more to equal straddeling/filling?
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Yes, and the photo below shows a new arrangement we offer for hinged MiniTraps and MondoTraps so people don't have to straddle corners or mount things permanently. It works very well with a 4-inch gap as shown.

--Ethan

mini-ficus.jpg
 
703 foil backing?

so I have my 2" 703 and some cool indian tapestries to cover it with..

the 703 I got does not have the foil backing i have seen on some peoples panels or was that the thicker 4" 703 or 705? .. should i add a thin sheet of plywood or fiberboard to enhance any absorbtion on the backside (to avoid reflections if mounted on the face) or should i be ok with just 2 layers of 2" raw 703?
 
ecstasteve said:
so I have my 2" 703 and some cool indian tapestries to cover it with..

the 703 I got does not have the foil backing i have seen on some peoples panels or was that the thicker 4" 703 or 705? .. should i add a thin sheet of plywood or fiberboard to enhance any absorbtion on the backside (to avoid reflections if mounted on the face) or should i be ok with just 2 layers of 2" raw 703?
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Don't have plywood/fiberboard on the back. It doesn't allow you to space the material out from the wall and improve its effectiveness.
 
pandamonk said:
Don't have plywood/fiberboard on the back. It doesn't allow you to space the material out from the wall and improve its effectiveness.
Click to expand...

i meant on the back of the 4" deep frame which would still get spaced out from the wall when i mount them. still the same thing? I ask because some of the bass traps that are shown on ethan's site are built with plywood backs but they are mounted directly to the wall in his examples i think.

thanks for all the advice from everyone who has responded!
 
No plywood backs at all. If you do, then any spacing behind will do no good.

Bryan
 
ecstasteve said:
i meant on the back of the 4" deep frame which would still get spaced out from the wall when i mount them. still the same thing? I ask because some of the bass traps that are shown on ethan's site are built with plywood backs but they are mounted directly to the wall in his examples i think.

thanks for all the advice from everyone who has responded!
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I know what you meant. That's what i was replying to. If you have a reflective bit on the back, then no matter how far you space it from a wall, your maximum depth of absorption is 4". With no back/fabric back you can space it as far as you want.

Ethan has plywood backed panels? Only if you are mounting directly on the wall would you use plywood, but even then there is no point.
 
well i've made 2 traps so far and just propping them up in a couple of corners has made a HUGE difference in the clarity of bass in the room (it's a weird "L" shape). the long arm of the "L" is 6.5' x 17' and the short arm is basically a 6' x 9' box tacked on to the long arm (165 sq. ft. total). It's a little room in the basement that was originally the laundry room/office space in the townhouse i purchased.

My console is tucked in at the end of the long arm of the "L" (hence my concern with the space taken up by the traps in my original post) and i will have traps straddling the 2 corners and the ceiling at my console and one behind me on the right at other end of the long arm. I can't put any more corner traps up due to door placement and where the stairs from the basement to the main level cut into one corner of the room. I also picked up a couple of cheapo Auralex Rooominator kits on sale at gtr center for 130 clams each to help tame reflections.

It's just a home project studio for me and my buds that never gave up playing so I am doing what I can to make it is as fun to be in as possible and get better gtr and vocal home recordings than i could in my last crappy apartment (we run bass direct and have a Roland cheapo electric kit for "quiet" drumming). Since it's my house i get to play through real amps hahaha although i have a vox digiblab for extra quiet jams and late night inebriated idea fests.

It doubles as my hang out room with an extra 50" plasma and sound system so the xbox360 will be slamming in here too ;).

I'll post some pics in the "show us your studio" thread in a couple of weeks when i've got it all set up. It's starting to come together though and it will definitely be the best place I've ever had personally to jam since the glory days of sweaty rehearsal spaces ;)

thanks again for all the help.
 
No in-room tests yet Rick, but soon. The plan is to compare traps with one straddling each corner versus two in each corner like this.

--Ethan
 
Thanks Ethan. Say, doesn't this test show what a plain panel of 4"703 straddled across the corner gives you in Sabines per running foot?
http://forum.studiotips.com/viewtopic.php?t=536

Also, Scott says in his disclaimer for this test, there are NO STANDARDS for testing across corners(at least at the time of his posting the thread). So what do you use as a "standard" Ethan?:confused:

fitZ:)
 
RICK FITZPATRICK said:
doesn't this test show what a plain panel of 4"703 straddled across the corner gives you in Sabines per running foot?
Click to expand...

The problem with that test is they didn't have enough material to ensure the results are not down in the noise. A lab's reverb room is very large, and they tested only two panels. The standard for lab tests demands at least 60 square feet of surface. That test falls far short of the mark. Much more here:

Alternative Test Methods for Acoustic Treatment Products

--Ethan
 
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