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Re: PS... That was a good link

Hi all,

Note that one can actually design a vented box with group delay equal to - or lower than - a sealed box over the audible range. Additionally, note that since group delay is a derivative WRT frequency, the lower in frequency you play the higher the group delay - sealed OR ported.

Sealed boxes are easy to use, and quite effective; however, there are many benefits to ported boxes that really should not be dismissed out-of-hand. Lower distortion, lower extension, equivalent group delay (from an audible standpoint - below the threshold of audiblity), and a few other benefits mean a properly ported box can be even more effective.

NOTE: we don't espouse vented or sealed, but rather a proper design for a given application. We have finished products and kits implementing both approaches, and drivers suited to both applications.

Dan Wiggins
Adire Audio

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