Re: Egg Tray Carton

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monreq

monreq

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Joined 2008
#1
Re: Egg Tray Carton

Hello! I just want to share the effect using egg tray carton. I used it in my DIY bass reflex project for Audio Nirvana Super 8.

Here are the pictures:
An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


I just used carpenter's glue and thumb tacks in installing the egg tray carton for speaker insulation. I chose egg tray carton because it is cheap and I think it is effective.

Here is the video link to give you an idea how it sounds:

YouTube - My Audio Nirvana Super 8 Pointsource Speaker Best Performance Part 1

Thank you.🙂
 
#2
It's only think pulp card so I don't see how it would achieve much apart from minor scattering at HF. It won't mass load the walls and doesn't provide much in the way of absorption. I've read one diy article in the past which specifically said not to use it.

Have you tried with and without, say one speaker with it removed and a track played in mono? (From the YouTube video, I'm guessing the Yamaha amp has a mono switch - something I wish modern amps would include more often.)

Regular wadding or carpet felt will almost certainly be more effective.
 
#4
Colin said:
It's only think pulp card so I don't see how it would achieve much apart from minor scattering at HF. It won't mass load the walls and doesn't provide much in the way of absorption. I've read one diy article in the past which specifically said not to use it.

Have you tried with and without, say one speaker with it removed and a track played in mono? (From the YouTube video, I'm guessing the Yamaha amp has a mono switch - something I wish modern amps would include more often.)

Regular wadding or carpet felt will almost certainly be more effective.
Click to expand...
I tried it before I finalize it. The speaker cabinet without an egg tray carton was not focus (HF, MID, LF)...and has something like a honk sound. But when I use the speaker cabinet with egg tray carton, the overall frequencies were focused and very natural. You can hear it on the video and the sound is very much better on actual listening test.

So, as per experience on egg tray carton, is fine with me. Since I am using an Audio Nirvana Super 8 speaker in bass reflex design cabinet, lots of my friends were amaze with the very cheap egg tray carton for its natural sound reproduction. Also, I don't put too much insulation when I use point source speakers. Too much insulation kills the natural sound reproduction of the speakers. That is why open baffle speaker design has more natural sound reproduction because it has no insulation.

You can try it for yourself with a single driver speaker. Try to experiment it by yourself before you believe others. Good luck.🙂
 
#6
What is the Insulation/Filling For?

The main reason for using insulation in a box is to reduce standing waves. Reflections of sound off walls and features of a box will mix with other waves inside the box. They will add or subtract depending on phase and time delay. This family of standing waves adds to the sound of the box, especially in the midrange region. You don't want the box creating sounds of its own. The standing waves can also excite resonances of the panels, making additional noise.

In summary, the speaker will "think" it is in a slightly bigger box with the insulation. The box without filling will sound louder, but the extra volume is the added coloration caused by the standing waves. Thus, as long as you hear the proper timbre of the vocals and instruments, egg carton is effective. I experimented it with my two friends who are familiar with instruments actual sound. If the sound gives a flat response, then, the insulation is effective.

Thanks for the comments.
 
#10
Lots of years ago... ...who got to eat all the eggs :dead:
Click to expand...

During my "band in the house" phase, we lined the walls with those crate liners.

It worked well.
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+1:up:...though no one ever went outside while we were making noise to check the effect. :scratch1:

However, as it relates to the interior of speakers, You may want to consider the resonances that result from a particular set of internal dimensions...size your casework to avoid them...and brace the larger panels so they don't vibrate.
 
#11
I'd say they could be useful inside the box despite the fact that they steal space inside (so the internal volume could be filled with spray foam ?!) and another layer of felt-polysomething should be added on the ( odd-shaped ) surface ..well ,depending on where they are located and in which kind of box.
 
#12
godfrey said:
Lots of years ago I heard about people covering their walls with egg trays for sound absorbtion.

Not sure how effective it was, but I always wondered who got to eat all the eggs :dead:
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Not very, and a horrible fire hazard. Fortunately we have better materials like treated open cell foam and compressed fiber that actually absorb sound and won't kill you. People used to use cork too; useless, but people still think it works.

Inside a speaker, well I can think of a dozen better materials, but don't knock something if a particular build works.
 
#13
InclinedPlane said:
Will certainly break up 'standing waves'
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Will certainly have no effect on standing waves as there is not sufficient thickness for any meaningful absorption at low frequencies. So, pretty much no absorption under a few hundred Hz and a combination of absorption and reflection above resulting in a jagged response. It may suit a particular speaker if you are very, very lucky. Same applies if used to correct room acoustics.
 
#14
monreq said:
What is the Insulation/Filling For?

The main reason for using insulation in a box is to reduce standing waves.
Click to expand...

I think that the main reason is to reduce cabinet resonances, not standing waves. Although, standing waves can be somewhat of an issue.

The main thing is to convert interior acoustic energy into heat, rather than coupling that acoustic energy into mechanical movement of the cabinet or affecting the woofer's cone.

Extensive testing of materials have been done on this subject and from everything I have read, cardboard has not made the grade.

Rock wool gets high points in this department.
 
#16
godfrey said:
Lots of years ago I heard about people covering their walls with egg trays for sound absorbtion.

Not sure how effective it was, but I always wondered who got to eat all the eggs :dead:
Click to expand...


yes yes many years ago when i was a youngling, i lined the walls of my studio with the stuff. semi-worked until i got good enough building louder speakers, then i was able to turn them into rattling panels. it was like having a snare drum on the walls.
 
#19
I think it's a viable idea, and i've heard of people having done it before to good effect. It could be perfect in a situation where you wanted maximum diffusion with little damping, and it's a lot cheaper than those thingeys fostex sells...🙂
 
#20
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