It is crucial to match your speaker impedance (ohms) with your amplifier’s output impedance. Speaker impedance varies with frequency, so it is possible to approach dangerous conditions for your amplifier with an incorrect impedance load. A lot of amplifiers have multiple taps to accept various cabinet/speaker impedances. On a solid-state amplifier, you gain power by lower speaker impedance. On a tube amplifier, you can safely connect a variety of different cabinets or speaker configurations. Plus, the various taps on a tube amplifier may give you a subtle difference in sonic quality. We recommend that you never connect a different speaker or cabinet impedance than what is listed on your amplifier without checking with the manufacturer to determine if it is safe.