A 4 ohm subwoofer has an impedance of 4 ohms, which is obviously higher than the 2 ohm sub. The higher resistance in a 4 ohm subwoofer means the bass reproduction won’t be as loud vs a 2 ohm subwoofer made with similar specifications. However, versus a 2-ohm sub, a 4-ohm subwoofer consumes less power from the amplifier, and the bass.
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