DCR is DC (direct current, or zero Hz) resistance. There is no such term as ohm resistance. If specified as resistance, it is DCR. If specified as impedance, a much bigger can of worms opens. To vastly over simplify, impedance is effective resistance at a specified frequency, an impedance curve is specified at enough points to allow a curve to be drawn between. Impedance is higher than DCR, which is why an 8 Ohm speaker measures less on DC multimeter. 8 Ohm would be "nominal" generally a mean figure. Not to be confused with Sports Illustrated models, who have mean figures of their own.







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