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My speaker has a range of impedance, rather than a single value - why?


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#1 of 3 evs25

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Posted December 23 2011 - 11:54 AM

My speakers (eltax symphony 6.2) say on the back that their impedance is '4-8 ohms'. Why does it give a range rather than a single value? Is it something to do with them being bi-wirable? Maybe it means '4 ohms if you bi-wire them, 8 if you don't'? I'm asking because my amplifier (Rotel RA820) says speaker impedance should be 8ohms or greater, and I want to know if it will work with these speakers. Apologies if this is a silly question, I'm new to this! All replies would be much appreciated.

#2 of 3 Robert_J

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Posted December 24 2011 - 08:14 AM

Resistance is a constant number. Impedance varies by frequency. Speaker manufacturers just take the lowest impedance and give that number. Basically, your speakers are 4 ohms.

#3 of 3 evs25

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Posted December 26 2011 - 11:28 AM

Great, thanks for the answer!