Impedance Matching: Ensure that the amplifier’s impedance matches the impedance rating of your speakers. Mismatched impedance can lead to poor sound quality and potential damage to the amplifier or speakers.
When choosing an amp, another thing to keep in mind is the minimum impedance it can handle. Impedance is the current demand a speaker puts on an amplifier, and if your amp can’t handle this demand, it may overheat. Impedance is measured in Ohms, and most speakers are rated between 6-8 ohms. That said, there are also a lot of speakers that can drop as low as 4 ohms.
Because of this, we always recommend you buy a “high-current” amp (most amps made for hi-fi enthusiasts are) that is 4 Ohm capable.