Foam inside Panasonic speaker enclosure

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Werewolfbox

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Hello,
I just started getting into actually opening up some of these old boxes in order to fix them.
The fear is slowly fading away. Right now im working on Panasonic RX-CT900. I got the main console working ok and both tape decks are good to go,
but I need some help with identifying some foam inside the speaker enclosures. the actual driver needs to be refoamed which I think i can handle but there is a layer of foam that is behind the driver that I want to replace because its old and crumbling. I have attached a photo for reference.
What is this foam called? where is the best place to get it?

IMG_8085.JPG

Any advice/help would be greatly appreciated!

S.
 
floyd

floyd

Boomus Fidelis
I think the foam is placed there as a baffle over the speaker I guess it's to break up the sound waves coming from the back of the speaker because they can cause distortion.
 
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Werewolfbox

New Member
floyd said:
I think the foam is placed there as a baffle over the speaker I guess it's to break up the sound waves coming from the back of the speaker because they can cause distortion.
Click to expand...
Im sure youre correct. Now I need to know what type of foam it is.
 
Reli

Reli

Boomus Fidelis
Just search ebay for acoustic foam, acoustic fiber, or acoustic padding. That model is not a very powerful one, so I wouldn't use thick material because it can muffle the midrange a bit.
 
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floyd

floyd

Boomus Fidelis
Basically the purpose of this foam is the break up the back sound wave from the speaker because otherwise it would just echo through the box until it resonates itself out. You really only need this if the walls of the Box are really thin and will resonate with the sound this cuts down on the resonance. You can lightly stuff the box with polyfill and they will do the exact same thing. Pillow stuffing works great in a pinch lol.
 
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Reli

Reli

Boomus Fidelis
If the walls are really thin and make a cheap hollow noise when I knock on them, I stick some Dynamat on the inside walls. It reduces the shitty-sounding mid-bass and makes deep bass more noticeable. Actually I use RockMat from Ebay, because it's cheaper than Dynamat. But you don't want to completely cover the walls with it, because that can reduce the volume by completely eliminating resonance. You only want to partly eliminate it. In my opinion at least.
 
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Reli

Reli

Boomus Fidelis
Oh by the way....Anything would be better than this ridiculous piece of styrofoam I found inside a Lasonic LPC-82. And yes I was the first person inside, the screws made a popping noise


IMG_8999.jpg
 
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floyd

floyd

Boomus Fidelis
Reli said:
Oh by the way....Anything would be better than this ridiculous piece of styrofoam I found inside a Lasonic LPC-82. And yes I was the first person inside, the screws made a popping noise


View attachment 55227
Click to expand...
That is strange because Lasonic usually doesn't put any kind of stuffing in their speaker boxes.
 
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