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Just bought a Polk CSi30 center speaker and the manual states its impedance as 'Nominal 4 Ohms' though on the website its listed as 8 Ohms, will hooking up a multimeter to it tell me for sure what ohms the speaker is? It lists the CSi20 and CSi40 models as 4 ohm speakers as well.


I'm using Polk R15's (8 ohms) all around and wanted a matched center speaker, will running just a single 4 ohm speaker still be a bad idea on a receiver that's more suited for 8 ohm speakers?
 

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It depends on the receiver. Having a 4 Ohm center with 8 Ohm mains isn't a problem. Most speaker's resistance varies anyway, so it's not a big thing.


Ideally, your receiver should be rated for 4 Ohm speakers. If not, it should at least be capable of driving to 4 Ohms. You can learn this from the manufacturer or here in the receivers/amps area asking if others run lower resistance speakers with the same model receiver.


Michael
 

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It won't be a "bad idea" as long as the receiver is capable of driving a four ohm load. Hooking up an ohm meter will indeed tell you the impedence of the speaker. As far as whether the speakers are matched...the impedance does not matter so long as the drivers are constructed with similar materials and they "sound" the same...ie same tonal balance, similar tweeter construction, etc. The receiver should have adjustments to overcome the impedance differences and balance out the volume of the centers vs. the other speakers...remember...anytime you cut the impedance in half on a speaker, a perfect ampifier with a rock solid power supply will double the power output, resulting in an overall volume increase of only 3 Db. 3 Db should be easy to overcome with the receiver adjustment.


Best Regards,


DiMora
 
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