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Path: utzoo!linus!philabs!cmcl2!seismo!harvard!sasaki
From: sasaki@harvard.ARPA (Marty Sasaki)
Newsgroups: net.audio
Subject: table saws, KEF B110, transmission lines
Message-ID: <291@harvard.ARPA>
Date: Wed, 7-Aug-85 12:25:05 EDT
Article-I.D.: harvard.291
Posted: Wed Aug  7 12:25:05 1985
Date-Received: Sat, 10-Aug-85 23:32:19 EDT
Distribution: net
Organization: Harvard Science Center
Lines: 27

If things are set up properly, a table saw is much more accurate than
a hand saw.  I've built jigs and special cutoff boxes that allow
extreme accuracy and very quick cutting.  In any case, always use a
sharp blade on the saw, keep your fingers clear of the blade, and use
some kind of eye protection. Ear protection is also a good idea.

The KEF B110 has been mentioned several times recently as a pretty
good speaker.  I've heard from some folks that there are now better
units that cost less, have flatter response, etc. Does anyone have any
experience with possible replacement drivers?

I'm in the process of building a transmission line enclosure. The
classic wisdom is to make the length of the line equal to one fourth
the wavelength of the driver's resonant frequency. The line is then
stuffed with some kind of damping material. I understand the reasons
for the quarter wavelength length, and the use of damping material.
What I don't understand is why using both works. The length of the
line in all of the articles that I've seen is calculated by the speed
of sound in air, not the speed of sound in the damping material.
Intuition tells me that the length should be calculated by the speed
of sound in the damping material. Help!
-- 
----------------
  Marty Sasaki				net:   sasaki@harvard.{arpa,uucp}
  Havard University Science Center	phone: 617-495-1270
  One Oxford Street
  Cambridge, MA 02138