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Multi-Way Conventional loudspeakers with crossovers

Stuffing "sound signature"
Stuffing "sound signature"
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Old 7th October 2012, 05:39 AM   #1
Remlab is offline Remlab  United States
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Join Date: Apr 2011
Location: Mission Viejo Ca
Default Stuffing "sound signature"

Can a stuffing type have it's own sonic signature? Or does it all just come down to absorption coefficients? In other words, can two completely different materials (High grade acoustic wool felt vs foam for example) loaded in a cabinet in a way that "simulates" the same absorption coefficients(What the back of the diaphragm acoustically"sees" while in the cabinet.) have the potential to sound subjectively different when used in otherwise identical situations?
It's not what you don't know that causes trouble. It's what you do know that just ain't so..Mark Twain

Last edited by Remlab; 7th October 2012 at 06:15 AM.
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Old 7th October 2012, 06:06 AM   #2
Keriwena is offline Keriwena  United States
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Join Date: Feb 2010
Location: in half space
Since the various stuffings affect different frequencies, obviously "yes", but I think it will be overwhelmed by speaker and box signatures. I think any amateur builder who's listened to enough speakers in enough boxes to be able to identify the stuffing used when he walks into the room needs to get a hobby.

That said, I wouldn't doubt someone that said they could see the effects, or even predict the affect, on a graph.

(And yes, for you ESL folks, this is an example of the sometimes subtle difference between "effect" and "affect".)

Oh, except for stuffing a closed box to affect the tuning. Then it's just a matter of the R factor.

Last edited by Keriwena; 7th October 2012 at 06:16 AM. Reason: Forgot something. ;)
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Old 7th October 2012, 06:22 AM   #3
ScottG is offline ScottG  United States
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Join Date: Feb 2003
Location: US
To the extent it damps linear motion of a driver or port/line - yes. A lower freq. absorber tends to be "stiffer", and usually creates less damping of driver or port/line. Something "fluffier" that absorbs at higher freq.s tends to increase damping.

This is most noticeable with low mass, low x-max drivers with low energy absorption surrounds (..often "full-range").

The term: "sucks the life out of the driver" is a direct consequence of this.
perspective is everything

Last edited by ScottG; 7th October 2012 at 06:25 AM.
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