Match the amplifier’s output rating at the speaker’s impedance, such as four or eight ohms, and choose an amplifier whose power is appropriate for the speaker’s recommended handling range. For distributed audio systems, verify whether the speakers use a 70- or 100-volt line, then select an amplifier that supports the same high-impedance format and provides enough channel capacity for the connected speakers.

Choose a two-channel amplifier for stereo audio or to power two speaker channels, and choose a multi-channel amplifier when one compact unit needs to serve several speakers, zones, or audio sources. Choose a single-channel amplifier for a dedicated application, such as powering a subwoofer, supporting paging audio, or driving a mono, 70- or 100-volt speaker system.

When connecting a small amplifier to a TV or audio source, look for the inputs your system uses, such as analog RCA, optical Toslink, balanced or unbalanced audio, and Bluetooth. For control-system integration, useful options include infrared learning, a hard-wired IR input, RS-232, TCP/IP, or audio-sensing power control, depending on the installation.

Yes, some small amplifiers support both low-impedance speakers, such as four- or eight-ohm systems, and high-impedance systems using 70- or 100-volt lines. Check the amplifier’s specifications for selectable output modes, then match the setting to the speaker system before installation.