yeah - the way to calculate the resistance of a resistor (in this case the speaker) is:
if ita in series, then add up all the resistances. If its in parallel then add up the resistances and devide that number by the total number of resistors.
eg, if you have three speakers, wired in parallel, and each is 2ohms, then the total resistance would be (2+2+2) / 3 or 6/3 which is 2ohms. you could, technically add twenty 2 ohm speakers in parallel to one amp channel, and run them all
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