Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site mordor.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!zehntel!dual!mordor!sjc From: sjc@mordor.UUCP (Steve Correll) Newsgroups: net.audio Subject: Re: Wiring Your House for Sound Message-ID: <5131@mordor.UUCP> Date: Thu, 2-Aug-84 18:09:18 EDT Article-I.D.: mordor.5131 Posted: Thu Aug 2 18:09:18 1984 Date-Received: Sat, 4-Aug-84 02:21:22 EDT Organization: S-1 Project, LLNL Lines: 23 W. Mitchell cited one disadvantage of wiring multiple speakers in series. Another, and more drastic, problem with wiring speakers in series occurs when the speakers are different models and therefore do not have identical impedance-vs-frequency characteristics. For example, suppose speakers A and B both present a 4 ohm impedance at 400Hz, but A rises to 6 ohms at 2kHz while B rises to 12 ohms at 2kHz. Then A and B will share the voltage equally at 400Hz, but B will get twice as much as A at 2kHz, and therefore B will sound too bright while A sounds too dull. Nonetheless, AR used to recommend series connection provided the speakers were identical models. I never tried it myself. Running the signal from the preamp through the walls to a separate amplifier at each set of speakers seems sensible compared with searching for exotic kinds of speaker cable. Some preamps can actually drive fairly low impedance loads (the old Dynaco PAT-4, for example) and, if you're nimble with a soldering iron, Signetics NE5534 opamps can supposedly be made to drive 600 ohm loads. --Steve Correll sjc@s1-c.ARPA, ...!decvax!decwrl!mordor!sjc, or ...!ucbvax!dual!mordor!sjc -- --Steve Correll sjc@s1-c.ARPA, ...!decvax!decwrl!mordor!sjc, or ...!ucbvax!dual!mordor!sjc