In Reply to: RE: Any of you heard the Vapor Audio Cirrus or Breeze? posted by Pete Schumacher on August 16, 2012 at 07:25:43:
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.
Edits: 08/16/12
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Follow Ups
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - villastrangiato 07:58:18 08/16/12 (36)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - Pete Schumacher 11:11:18 08/16/12 (35)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - Spkr_Bldr 21:08:49 08/16/12 (34)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - villastrangiato 21:24:23 08/16/12 (33)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - Spkr_Bldr 21:49:54 08/16/12 (32)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - villastrangiato 05:36:39 08/17/12 (31)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - miyy4u 00:37:16 08/18/12 (29)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - ejk 03:24:13 08/18/12 (28)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - rebbi 20:39:16 08/19/12 (26)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - Spkr_Bldr 08:07:46 08/20/12 (11)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - villastrangiato 16:46:38 08/20/12 (10)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - agisthos 17:10:29 08/28/12 (9)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - villastrangiato 09:13:35 08/30/12 (0)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - toddnkaya 14:03:43 08/29/12 (7)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - rebbi 17:48:35 08/30/12 (6)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - vortrex 16:26:04 08/31/12 (5)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - rebbi 10:56:40 09/01/12 (0)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - saeyedoc 08:51:12 09/01/12 (3)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - vortrex 11:05:25 09/01/12 (2)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - vortrex 11:41:30 12/11/14 (0)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - JP1208 11:20:42 12/11/14 (0)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - villastrangiato 03:30:26 08/20/12 (13)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - rebbi 08:37:12 08/20/12 (12)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - villastrangiato 16:55:36 08/20/12 (11)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - toddnkaya 19:20:02 08/20/12 (7)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - miyy4u 16:00:56 08/21/12 (6)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - Spkr_Bldr 19:51:32 08/21/12 (5)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - miyy4u 21:53:39 08/22/12 (2)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - Pete Schumacher 06:15:28 08/23/12 (1)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - miyy4u 15:27:19 08/23/12 (0)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - villastrangiato 16:16:10 08/22/12 (1)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - rebbi 07:57:20 08/23/12 (0)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - rebbi 18:30:15 08/20/12 (2)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - Spkr_Bldr 20:01:42 08/20/12 (0)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - villastrangiato 19:07:14 08/20/12 (0)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - miyy4u 01:16:05 08/19/12 (0)
- RE: Any of you heard the Vapor Audio Cirrus or Breeze? - Pete Schumacher 07:09:45 08/17/12 (0)