Posted by Martin [ 64.12.116.65 ] on April 09, 2005 at 13:31:13:

In Reply to: Re: First Impressions posted by manualblock on April 09, 2005 at 12:36:43:

David is a nice guy and I have bought several pairs of drivers from him. Very enthusiastic about his products and he has taken a lot of criticism for his positions. He is very upfront about his beliefs. But, I definitely do not agree with David.

If you look at the 8" full range drivers he sells, they do have a lot in common. Typically they have a fs between 50 and 60 Hz, a Qts between 0.20 and 0.35, and a Mms between 10 and 15 gm (so the Vas values are also close). This includes the Lowthers and the Fostex drivers. If you put any one of these drivers in a ported enclosure tuned to say 55 Hz, the final performance of the drivers will be close. The enclosure only reinforces the bass below 100 Hz. The amount of bass produced will be a function of the Qts, low Qts will have weaker bass output. His enclosure will work under the right conditions but they are probably (maybe I could claim definitely) not optimum.

Martin

• Quarter Wavelength Loudspeaker Design

Replies:

• Re: First Impressions - akhilesh 13:53:47 04/13/05 (0)
• Enclosure Size and Tuning - FredT 20:28:21 04/09/05 (4)
  • Re: First Impressions - ronbrady 00:33:04 04/10/05 (1)
    • Re: First Impressions - FredT 04:42:54 04/10/05 (0)
  • Re: Enclosure Size and Tuning - Martin 20:52:23 04/09/05 (1)
    • Toe-In - FredT 05:20:24 04/10/05 (0)
• Re: First Impressions - Wayne Parham 14:29:10 04/09/05 (1)
  • Re: First Impressions - manualblock 15:30:17 04/09/05 (0)