Rear woofer loading?

Mos Fetish · 28th November 2003, 10:16 PM

From another post:

"I do have some thoughts on side firing woofers. GRollins stated that side firing woofer could keep the frontal width smaller and is obviously true. The performance suffers as the proximity of the two sides increases, requiring more sophisticated defraction baffling within the enclosure (such as BMW's matrix system) to prevent rear woofer loading. This is where deeper is better."

If it's true that a woofer's performance can suffer due to it being too close to the back interior wall of the box, then what are the tolerances involved?

Anyone

Mos

Ron E · 29th November 2003, 12:31 AM

The woofer is loaded by the "springiness" of the air in the enclosure, not the proximity of the back wall.

The proximity of the back wall (or more generally the opposing wall) only affects the frequency of the first resonant frequency. Shorter distances mean higher frequencies, and that's a good thing in general for woofers; regardless, the waves will be greatly absorbed by damping material...

I wouldn't worry about it.

sreten · 29th November 2003, 01:50 PM

Just add B&W's matrix system has nothing to do with 'diffraction'
or 'diffraction baffling', its a bracing system for the cabinet.

Deeper is better only applies to the backwave of bass/midrange units, which you cannot side mount, you can only side mount
bass units with a front mounted midrange unit.

As Ron E said, its not an issue with woofers.

28th November 2003, 10:16 PM	#1
Mos Fetish diyAudio Member Join Date: Feb 2003 Location: New Zealand	Rear woofer loading? From another post: "I do have some thoughts on side firing woofers. GRollins stated that side firing woofer could keep the frontal width smaller and is obviously true. The performance suffers as the proximity of the two sides increases, requiring more sophisticated defraction baffling within the enclosure (such as BMW's matrix system) to prevent rear woofer loading. This is where deeper is better." If it's true that a woofer's performance can suffer due to it being too close to the back interior wall of the box, then what are the tolerances involved? Anyone Mos

29th November 2003, 12:31 AM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	The woofer is loaded by the "springiness" of the air in the enclosure, not the proximity of the back wall. The proximity of the back wall (or more generally the opposing wall) only affects the frequency of the first resonant frequency. Shorter distances mean higher frequencies, and that's a good thing in general for woofers; regardless, the waves will be greatly absorbed by damping material... I wouldn't worry about it. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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29th November 2003, 01:50 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Just add B&W's matrix system has nothing to do with 'diffraction' or 'diffraction baffling', its a bracing system for the cabinet. Deeper is better only applies to the backwave of bass/midrange units, which you cannot side mount, you can only side mount bass units with a front mounted midrange unit. As Ron E said, its not an issue with woofers.

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