Match the amplifier’s supported load to the speaker’s nominal impedance, and avoid connecting speakers below the amplifier’s minimum rated impedance; for distributed 70V speakers, use an amplifier with a 70V output. Compare the amplifier’s rated power at that impedance with the speaker’s power-handling specification, allowing reasonable headroom without exceeding the speaker’s rating.

Two-channel amps power two speaker channels, making them suitable for a stereo zone or a left-and-right speaker pair, while multi-channel amps provide four or more channels for multiple zones or larger home theater and whole-home audio systems. Distributed audio amps are designed to send audio across many speakers, often through 70V or hybrid 70V and 8-ohm outputs, with features such as zone routing, signal processing, and network control for commercial, landscape, or multi-room installations.

Choose a 70V amp for passive speakers when a project uses many speakers across zones, such as commercial spaces, outdoor areas, or distributed audio systems. Choose a low-impedance amplifier for conventional eight-ohm or four-ohm speakers, home theater channels, or systems where each speaker connects directly to a dedicated amplifier channel.

Amps for passive speakers may offer multiple channels, zone assignment, and support for 8-ohm, 70V, or hybrid speaker systems, helping integrators scale audio across homes, commercial spaces, and outdoor areas. Common installation features include balanced and unbalanced analog inputs, digital inputs, loop outputs, speaker-level connections, rack-mount designs, and control options such as 12V triggers or network-based configuration, depending on the amplifier.