AVS Special Member
Join Date: Dec 2007
Location: Southern California
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You need to realize that every speaker system has a different impedance at each frequency.
To really see what the impedance of a particular speaker system looks like, you need to find a published graph of their impedance vs frequency.
It is very common for speakers to have an impedance between 3 and 5 ohms at some frequency below 100 Hz, and then go up to as high as 20 ohms or so at some higher frequency.
Your receiver will no doubt handle TWO speakers that go down to 4 ohms, but if you try to run 5 speakers with impedance that low, the receiver power supply will not be able to supply enough current to drive them all at higher volumes.
The speaker manufacturer should be able to supply you with a graph of impedance vs frequency for your speaker system model.