Speaker Asylum

General speaker questions for audio and home theater.

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RE: Any of you heard the Vapor Audio Cirrus or Breeze?

Posted by villastrangiato on August 16, 2012 at 07:58:18:
Schumacher said: "Your citing the post at PE about helmholtz tuning is mystifying. I'll leave it to the readers to decide who and who does not have an understanding of the process."

For anyone with 20/20 vision, the maximum SPL curve in the link above showed the purple (standard bass reflex tuning) having a deeper bass extension (F3) than the green curve (so called "assisted bass reflex tuning"). Evidently, Mr. Schumacher either doesn't have 20/20 vision or he has a significant reading comprehension deficit.
For those who aren't technically inclined, most bass reflex tuning designs place the tuning frequency of the box at or very near the woofer's resonant frequency to counteract the woofers uncontrolled motion at that frequency and maximize acoustic output. What Schumacher was trying to support as a design theory is neither optimal nor commonplace in the industry as evidenced by most of the test measurements one can readily find on speakers reviewed by John Atkinson of Stereophile. The standard BR tuning produces lower woofer excursion for the same output, deeper bass extension, and consumes less amplifier power in the process over the useful operating frequency range of the driver. This particular example is what distinguishes DIY wannabees from actual loudspeaker engineers who possess adequate training and experience.