overtones/droning

  • Thread starter Thread starter Amped
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You'll probably end up trapping all 4 corners and at least half the ceiling vault, with some patches here and there along the walls, before you're happy. Clap your hands every so often to check for flutter, you might wanna look at some of the angled slat absorbers like Laptoppop did... Steve
 
"Whats the ideal thickness of the 703 for this application?" -

About 6 feet... :=)

OK, maybe only 4 feet... Seriously, the thicker the absorbent the more absorption - the DENSER the absorbent the more low frequency absorption per unit thickness - the further the absorbent is spaced away from a boundary (wall) the lower the frequencies that will be absorbed - practically, a couple of 2" layers across the corners (4" thick total) should get most of it done. Using a corner varies the distance between absorbent and boundary, so will broaden out the range of frequencies affected by the trap. This is why the wider you can make the front angled absorbent, the deeper bass will be affected.

Keep in mind, though, that this is NOT the way to control really DEEP bass - it's a 1/4 wavelength formula, so optimum absorption for 30 hZ, for example, would have the absorbent placed 9.4 FEET away from the wall (wavelength(in feet) = 1130/frequency, = 1130/30, which is 37.66 feet, /4=9.416 feet. (Thought I was kidding about the 6 feet thing, din'cha?)

For those reasons, low bass is better handled by panel traps (similar to Ethan's) or slat resonators (tricky to build for those low freqs or the areas behind splayed walls/sloped ceilings, where there's some depth to play with.

With your room dimension ratios, you're gonna need a fair amount of treatment before you're really happy with the sound - what I'd do is just go buy at least 30 2'x4' pieces of 2" 703, and start playing with them starting with the areas we've already talked about... Steve
 
Amped,

Steve has given you some excellent advice here (not that i would expect any less of him).

You can construct some pretty decent deep bass traps using Ethan's DIY bass trap designs.

Let us know how things move along.

Rod
 
Oh, BTW Jim, don't let the "newbie" label fool you - Rod is only a "newbie" HERE - trust me, if he gives you advice you should listen. (Specially the part about how wonderful Steve is :=))

Rod, good to see ya here, buddy - hope everything's well with you, got that turkey fattened up yet? ... Steve
 
knightfly said:
Oh, BTW Jim, don't let the "newbie" label fool you - Rod is only a "newbie" HERE - trust me, if he gives you advice you should listen. (Specially the part about how wonderful Steve is :=))

Rod, good to see ya here, buddy - hope everything's well with you, got that turkey fattened up yet? ... Steve
Click to expand...

Thanks Steve for the warm welcome.

Turkeys sitting and begging to be eaten, I hope this holiday season is nothing shy of fantastic for you and yours.

Sincerely,

Rod
 
Rod, thank you - and right back at'cha - I'm sure ours will be, both kids doing well in their own businesses, and two wonderful grandkids from our son (second one, a girl, just this year) - we are truly blessed, and Thanksgiving seems a particularly appropriate holiday.

Jim, and everyone else reading this - I hope you all have a happy and safe holiday season - remember, flaming desserts and dry Christmas trees are NOT a good combination no matter how many times you've seen it on America's Funniest Videos... Steve
 
Steve, yeah, Im aware of Rods credentials, Ive read his advice in other forums as well. After doing a little more research, I think Im goint to go with 705 (4") in the corners and clouds and 2" 703 for wall treatment. Ive also read some interesting articles on panel traps, I could actually build panel traps for the corners fairly simply, the thing is they wont be air tight so I dont know if it would be worth the effort.
I would also like to extend a warm holiday greeting to you and your family Steve, and a tremendous thank you for all your patience and invaluable information youve gracioucly provided me throuout this endevour... And to all.....
Ill be deep frying my bird,,,, you?
Later guys,
Jim
 
Jim, your plan should get you there - just remember, if it sounds good, it IS good (but it has to sound good where the MIC or your EARS are...)

If you can't make panel traps airtight, then you can't make panel traps. Not saying that the result wouldn't do SOMETHING, just that I've no idea WHAT that would be -

You're entirely welcome - I've used your experience a few times in convincing others to not deviate from recommendations by linking to your "quiet zone" thread, so everybody wins...

"Ill be deep frying my bird,,,, you?" - Nah, this is Oregon - freakin' rain makes the hot oil spatter too much, so double-bagged and roasted is probably it - deep fryer is great during nice weather though, I could almost eat a whole bird by myself done that way.

Don't forget when placing 703 on walls, that a 2" air gap behind it is nearly as good as putting up 4" stuff - you get an extra octave lower absorption "free" ... Steve
 
Hey Steve,
I have "black" moving blankets hanging in the room about 1" from the walls, rounding out the corners,, would it be acceptable to put the 2" 703 behind the blankets at an angle to hide it in the corners? Or would you consider the blankets too thick to allow for proper sound penetration to the 703. Im having some difficulty finding material with the correct dimentions to fully cover the 703 panels.
gobble gobble
Jim
 
Jim, the blankets won't hurt low absorption at all, and might help highs a bit - we can get into this more after the holidays, unfortunately I "get" to work all 4 days.

To everyone here, please have a happy and SAFE holiday... Steve
 
Well, after a few days of experimenting, I think I have my problem at least partialy solved. 16 pieces of 2" 703 FRK, 2 vertical in each corner, 3 behind the drums, 3 on one wall, two on the other centered at four feet. What a freeking difference! The nasty overtones are all but gone and theres zero droning from the bass drum. Im planning on gettin 6 more for the clouds and spot treatment where needed. Itll be interesting to here when the clouds are installed. Ill probably put the facing out on the clouds for a little more brightness. That 703 is amazing stuff. If youre having similar problems in your room, this is the way to go.
Steve, ya know, working on a holiday is a crime punishable by massive beer consumption on off days dontya?
Jim
 
"working on a holiday is a crime punishable by massive beer consumption on off days " -

And I plan on taking my punishment like a sponge... :=)

BTW, if you start finding that all your 703 treatments are taking too much of the highs (cymbals don't shimmer, etc) you can cover it with 1-2 mil poly - puts some highs back without affecting much else, plus does a good job of keeping the pesky little fibers in their rightful place... Steve
 
I havent really noticed any problems in the high/mids,,,,,,,,,,,,,yet, of course I havent tried recording the room lately. Im hoping I have enough exposed smooth surfaces to offset the 703, but, if the problem arises, Ill surely take you up on the poly advise.
Im just really amazed at the difference the 703 made even without the clouds.
Have a cold one on me and toast to inspiration!
Later.
 
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