SONOS

SONOS AMPG1US1, Amp 250W Stereo Power Amplifier (Each) - Black

Russound

Russound P125, 2 Channels (125W), Dual Source Amplifier - Black

Nippon America

Nipponamerica SPA-140SEL 4-Way Dual-Source, Impedance-Matching Speaker Selector with Zone Volume Controls.

WIIM

WIIM PRO PLUS, Multiroom Streamer Preamplifier with Voice Remote

Yamaha

Yamaha XDA-AMP5400RKBL, Multi-Room Amplifier (4 Zone, 8 Channel). (Each)

Nippon America

Nipponamerica SPA-160SEL 6-Way Dual-Source, Impedance-Matching Speaker Selector with Zone Volume Controls.

Russound

Russound MBX-AMP Streaming zone amplifier with Wi-Fi and Bluetooth

WIIM

WIIM Amp Ultra Music Streamer & Amplifier, 3.5 Touchscreen, Space Gray

Russound

Russound MCA-66, C-Series Controller 6 Source / 6 Zone Controller

Yamaha

Yamaha A-S301, Stereo Integrated Amplifier 2-Channels, (Black)

WIIM

WIIM AMP, Multiroom Streamer Amplifier, 60w per Channel, Silver

SONOS

SONOS PORT1US1, Port Versatile Streaming Component (Each) - Black