Acoustics
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Improving Acoustics In Your Listening Room Tips on identifying and resolving acoustic problems. Article By Malcolm J. Gomes

Improving Acoustics In Your Listening Room Tips on identifying and resolving acoustic problems. Article By Malcolm J. Gomes | Acoustics | Scoop.it
Improving Acoustics In Your Listening Room Tips on identifying and resolving acoustic problems. Article By Malcolm J. Gomes
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Subwoofer Group Delay

"Here we see that group delay peaks at 6.13 ms . This is over 4 times better than the vented case, and over 5 times better than the passive radiator case. Given that a sealed box is a second order system, and as such does not exhibit a rapid fall-off on the low end (nor the attendant 360 degree phase wrap of the vented or passive radiator systems), the overall group delay will be considerably lower."

 

"Ranking strictly in terms of group delay, we see that:

1. Sealed boxes are best
2. Vented boxes are second
3. Passive radiator boxes are third"

 

http://stereointegrity.com/docs/SIGroupDelay.pdf

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A Simple No-Fuss Subwoofer Set-up Routine

Steven Stone shows you how he sets up a subwoofer without getting technical...
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DP_woofer_room

The intent here is only to show that  through 
correct placement of two monopole woofers, with one woofer is connected with inverted polarity, the woofer system (i.e. the summed response form both sources) fails to excite at least the same room modes as dipole woofer system aligned with a room axis. Thus, such a configuration should therefore yield bass response which sounds subjectively similar to dipole a dipole woofer system while avoiding the complexity of dipole equalization and the need for high excursion woofers.

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