Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site angband.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore!decvax!genrad!teddy!panda!talcott!harvard!seismo!ut-sally!mordor!angband!sjc From: sjc@angband.UUCP (Steve Correll) Newsgroups: net.audio Subject: Re: Speaker fusing (particularly with CDs) Message-ID: <37@angband.UUCP> Date: Thu, 10-Jan-85 23:33:17 EST Article-I.D.: angband.37 Posted: Thu Jan 10 23:33:17 1985 Date-Received: Sun, 13-Jan-85 07:50:08 EST Distribution: net Organization: S-1 Project, LLNL Lines: 17 Speaker fuses need not degrade an audio system if one places them inside the power-amplifier feedback loop, immediately after the output transistors; I believe Heathkit used to do this. (The negative feedback used in audio amplifiers reduces not just the nonlinearity but also the output impedance. The impedance of a fuse is much less than the value of the emitter resistor used in many transistor output stages to stabilize the bias, and a fuse is probably much more nearly linear than the output transistors themselves.) I'm a little foggy with regard to tube amplifiers, but I believe the same trick might be made to work. Apropos the comment about a Sanyo CD player not being very shock-resistant, is it actually less immune than the usual turntable? -- --Steve Correll sjc@s1-c.ARPA, ...!decvax!decwrl!mordor!sjc, or ...!ucbvax!dual!mordor!sjc