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In Reply to: Beard Audio posted by miknwv on April 2, 2007 at 10:55:26:
Simply plug a cabel into them
Check them with an ohm meter
(youll be reading dc resistance)If they are less then 4ohms with a meter then they are 4ohm
If they read less then 8ohms and more then 6ohms they are 8ohm
Remember this is the DC resistance your reading but it works
Follow Ups:
It is impossible to measure DCR in a circuit with capacitors, and the DCR is no accurate representation of the complex impedence of a speaker. I have worked with speakers that are "8 ohms" with a DCR at the terminals of 7ohms, and when you test them with Leap you can see they drop as low as 2.8 ohms!!! Very scary.Some speakers present a more complex load than others, tis' the nature of the beast. Though a well designed speaker should have a well- controled impedance curve.
At a pawn shop with speakers like that, I would be careful all-around. PLay them soft for a while, then gradually increase the volume as you go monitoring the heat of the amp. If it is a PA/Pro amp, it likely has short and thermal protection anyway.
Mike "use your ears" Z
Im talking "average" impedance and yes the method with a VOM
does workIf you read 7ohms that loudspeaker is an 8ohm loudspeaker
Were not looking an impedance curve throughout the spectrum
He is looking at a way to get an average
sweet, thanks. i contacted the company, they havent heard of 'em for over 27 years, so these 15's are really really old, lol. im just gonna get a PA and put about 200 watts to 'em and use them til they blow.ever heard of messing up a PA because of too much impedance?
Not at allIn fact with more impedance the amp has to dump less current
and thus the amp will run stable
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