still, you have to watch out not to blow them out and also your receiver.
If resistance is too low, it means the receiver has to drive twice as much current with any given power rating.
If these were high power rating speakers, the first to blow out would probably have been the receiver (i.e., you'd have to drive the volume very high and the high current requirement would cause either severe distortions or the receiver would overheat and blow itself out).
However, with such a low power rating, it's likely someone will accidentally put too much current through and cause the speakers to blow themselves out. Usually, the way to resolve this is to limit the maximum volume on these speakers so it's in the safety area.
However, since you have two sets of speakers, most receivers will not let you set two different volume ratings...
So, if you're planning to do this and drive the speakers through your receiver, you'd have to prepare yourself for the possibility that you'd one day blow them out because you left the volume on too high.
The difference is that impedance is AC and resistance is DC. What you are measuring with a DVM is the resistance (impedance at 0Hz DC). The impedance may vary over frequency. For this guy's plan to connect to the lower power amplifer in the plasma (not a receiver) a 16ohm speaker would work, but wouldn't be as efficient as an 8ohm - so the volume may not be great. But try it, it shouldn't harm anything, and see if its good enough.
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