Question: what is the difference between a 2 ohm speaker and a 4-ohm speaker?
Answer: 2 or 4 Ohm refers to the nominal impedance. However, a 4 Ohm speaker can vary its impedance from 2,5 to 30-40 Ohm. ... The practical difference, between these two impedances, 2 or 4 Ohm, means if you have an amplifier and fix the volume control to a given volume, the 2 Ohm speaker will draw more energy from the amplifier.