Cardboard for open baffle

onform · 28th February 2011, 11:29 AM

This is not your average cardboard mind! It is very strong and rigid but still very light. I'm going to give it a go anyway just wondered what you guy's thought?

picowallspeaker · 28th February 2011, 12:00 PM

You can give it a try as long as you already have it. I have a cardboard mind !
But it's a well constrained layer damping...

onform · 28th February 2011, 12:23 PM

You have a cardboard
Mind

What have you used to damp yours and how large is it?

picowallspeaker · 28th February 2011, 12:41 PM

Skull being very tough

And I am an 'heavy smoker' , so many bitumen foils in the inside ,bracing...OH it's an OB

vibrational modes should be stopped at their raising ,but steel + cardboard is not very clever . Some wooden frame may be unnecessary... So you loose the benefits of having some light material such CB ,I might say it could be useful in 3D applications such as little boxes where speaker's motor is not very powerful ...in the 1-5 W range ...and cabinet construction and geometry allows not having large surfaces free to vibrate.

mor2bz · 28th February 2011, 01:40 PM

the reason OB sound better is not because the baffle doesn't vibrate
as much as a box. It does, and that is the source of some of the bass.

the best speaker i ever made was from a bicycle box with one side cut out
so it was a panel with 6" wings on all sides, hung from a ceiling. the driver
was fitted in a wood baffle that was screwed and glued to the box.
driver was a Moth Cicada. sounded unreal, just wouldn't get very loud.

picowallspeaker · 28th February 2011, 02:31 PM

As I said ,I'm a cardboard guy too . If you want to control the inertial mass
of the 'speaker holder (box or OB) ' and don't want to obtain random results ,it
is better to do a constrained layer damping ,even with a steel foil . I use PVC for external finish ,although it is pretty sound transparent , and bitumen foils on the inside . As in architecture ,structure of a building must have solid bases.
Otherwise ,you'll end with a colorado sound

Hey ! I know someone in Boulder and Hygiene BTW

thefamilybassman · 28th February 2011, 02:44 PM

I've found that cardboard is a perfect material for prototype building before cutting away at my MDF. My last design (camping/festival hifi based on ls3/5a's) left the side/top/bottom more resonant than the drivers themselves!

onform · 28th February 2011, 04:48 PM

The pieces I'm going to use are pre folded so I will have wings. The wings are of equal dimensions to the front baffle. I know that it is double ply and it's 15mm thick and very rigid! If I get the exact dimensions tomorrow would someone be able to run them through a program to find the optimum placement? Also any advice on OB design would be great! Oh btw I'm going to use the alpair7's.

Also I have another piece roughly 150cm sq and 35mm thick!! Do you think and OB sub is a good idea? I don't have a huge living room!

PKNJ · 2nd March 2011, 12:58 AM

I used cardboard to extend the size of an OB speaker. The cheap, normal corrugated cardboard they make boxes from. Worked quite well to demonstrate the principle. At the low levels I was generating, resonance wasn't the problem.

Try it out. No big loss if it doesn't work!

onform · 2nd March 2011, 04:56 AM

I brought the pieces home and placed them in my living room. I don't think an OB set up is quite suited to my room size!! Lol

28th February 2011, 11:29 AM	#1
onform diyAudio Member Join Date: Apr 2008	Cardboard for open baffle This is not your average cardboard mind! It is very strong and rigid but still very light. I'm going to give it a go anyway just wondered what you guy's thought?

2nd March 2011, 12:58 AM	#9
PKNJ diyAudio Member Join Date: Oct 2008	Go Right Ahead! I used cardboard to extend the size of an OB speaker. The cheap, normal corrugated cardboard they make boxes from. Worked quite well to demonstrate the principle. At the low levels I was generating, resonance wasn't the problem. Try it out. No big loss if it doesn't work!

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28th February 2011, 12:00 PM	#2
picowallspeaker diyAudio Member Join Date: Apr 2007	You can give it a try as long as you already have it. I have a cardboard mind ! But it's a well constrained layer damping...

28th February 2011, 12:23 PM	#3
onform diyAudio Member Join Date: Apr 2008	You have a cardboard Mind What have you used to damp yours and how large is it?

28th February 2011, 12:41 PM	#4
picowallspeaker diyAudio Member Join Date: Apr 2007	Skull being very tough And I am an 'heavy smoker' , so many bitumen foils in the inside ,bracing...OH it's an OB vibrational modes should be stopped at their raising ,but steel + cardboard is not very clever . Some wooden frame may be unnecessary... So you loose the benefits of having some light material such CB ,I might say it could be useful in 3D applications such as little boxes where speaker's motor is not very powerful ...in the 1-5 W range ...and cabinet construction and geometry allows not having large surfaces free to vibrate.

28th February 2011, 01:40 PM	#5
mor2bz diyAudio Member Join Date: May 2005 Location: colorado	the reason OB sound better is not because the baffle doesn't vibrate as much as a box. It does, and that is the source of some of the bass. the best speaker i ever made was from a bicycle box with one side cut out so it was a panel with 6" wings on all sides, hung from a ceiling. the driver was fitted in a wood baffle that was screwed and glued to the box. driver was a Moth Cicada. sounded unreal, just wouldn't get very loud.

28th February 2011, 02:31 PM	#6
picowallspeaker diyAudio Member Join Date: Apr 2007	As I said ,I'm a cardboard guy too . If you want to control the inertial mass of the 'speaker holder (box or OB) ' and don't want to obtain random results ,it is better to do a constrained layer damping ,even with a steel foil . I use PVC for external finish ,although it is pretty sound transparent , and bitumen foils on the inside . As in architecture ,structure of a building must have solid bases. Otherwise ,you'll end with a colorado sound Hey ! I know someone in Boulder and Hygiene BTW

28th February 2011, 02:44 PM	#7
thefamilybassman diyAudio Member Join Date: Feb 2011 Location: Cardiff	I've found that cardboard is a perfect material for prototype building before cutting away at my MDF. My last design (camping/festival hifi based on ls3/5a's) left the side/top/bottom more resonant than the drivers themselves!

28th February 2011, 04:48 PM	#8
onform diyAudio Member Join Date: Apr 2008	The pieces I'm going to use are pre folded so I will have wings. The wings are of equal dimensions to the front baffle. I know that it is double ply and it's 15mm thick and very rigid! If I get the exact dimensions tomorrow would someone be able to run them through a program to find the optimum placement? Also any advice on OB design would be great! Oh btw I'm going to use the alpair7's. Also I have another piece roughly 150cm sq and 35mm thick!! Do you think and OB sub is a good idea? I don't have a huge living room!

2nd March 2011, 04:56 AM	#10
onform diyAudio Member Join Date: Apr 2008	I brought the pieces home and placed them in my living room. I don't think an OB set up is quite suited to my room size!! Lol

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