I saw in an older review of a speaker where they had lined the bottom of the box with shredded cardboard to break up standing waves with the different heights and angles to bounce the waves in different directions and at slightly different lengths.
I did a lot of searching but didn't find anything like that mentioned elsewhere; so, I'm guessing it isn't a good idea but I was still curious.
I did a lot of searching but didn't find anything like that mentioned elsewhere; so, I'm guessing it isn't a good idea but I was still curious.
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Shredded cardboard is better than nothing I guess, but probably not by much.
The best stuffing material commonly available is glass fiber insulation. I put it in mesh laundry bags to contain the hazardous flyaway fibers. Next best is poly fluff or cotton batting.
The best location for any of this stuffing is suspended in the middle of the box, preferably behind the driver (but not too close) to absorb transmission of reflected energy back through the cone. Middle of the box is where the standing waves have maximum velocity (not sure if velocity is the precise term) Velocity is zero right at the cabinet wall.
This is a different concept than damping material on the walls, which is effective but should be used in conjunction with adequate bracing.
Just my 2 cents...
The best stuffing material commonly available is glass fiber insulation. I put it in mesh laundry bags to contain the hazardous flyaway fibers. Next best is poly fluff or cotton batting.
The best location for any of this stuffing is suspended in the middle of the box, preferably behind the driver (but not too close) to absorb transmission of reflected energy back through the cone. Middle of the box is where the standing waves have maximum velocity (not sure if velocity is the precise term) Velocity is zero right at the cabinet wall.
This is a different concept than damping material on the walls, which is effective but should be used in conjunction with adequate bracing.
Just my 2 cents...
I figured if it was a good idea it would be popular. I can't find the review again but it was for some Decware speakers and it was so old that I had to pull it up in the wayback machine.
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We recycle tons of it at work so I thought maybe 🙂
It looks like it should bounce things in different directions some and have slightly different heights so it isn't the same frequency bouncing back and forth.
It would be interesting to see measurements with and without.
It looks like it should bounce things in different directions some and have slightly different heights so it isn't the same frequency bouncing back and forth.
It would be interesting to see measurements with and without.