You can't simply use an ohm meter to determine impedance. The difference between a resistance measurement and Impedance measurement is that impedance includes the effects of capacitance, (resistance to change of voltage), and inductance, (resistance to change of current), when an alternating voltage or current is applied to circuit. In general, speakers designed for home use are 8 ohms. Car speakers are usually 4 ohms so they can draw more current at the limited 12 volts available. Good power amps start off with built in inverters/voltage doublers to et more voltage/power. Dennis
-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of Ben McCafferty Sent: Tuesday, January 28, 2003 7:37 PM To: vanagon@GERRY.VANAGON.COM Subject: NVC: measuring impedance of a speaker? Hi out there, Any of you stereo buffs: I need to determine if my home speakers are 4 or 8 ohms, so I can set my receiver properly. Unfortunately, there is no marking on the case or actual speaker anywhere, except "75 watts, magnetically shielded, design for t.v." I have a fairly sophisticated digital multimeter, but it only goes down to 200 ohms for resistance. Is there another way I can determine what I've got? If it helps, they are from Rock Solid Sounds, Worthing, England, Made in Taiwan. Thanks in advance, bmc :) Ben McCafferty ben@volkscafe.com Volks Cafe 1823 Soquel Avenue Santa Cruz, CA 95062 831-426-1244 http://www.volkscafe.com |
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