Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site harvard.ARPA 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