OSD MX880 4-zone, 8-channel multi-room power amplifier at Crutchfield
OSD Audio AMP60 25W Compact Stereo Power Amplifier with Bass, Treble Control - Walmart.com
OSD Workshop/Outdoor Sound System Package (Black speakers) Stereo audio system with Bluetooth® and Wi-Fi streaming amplifier and pair of outdoor speakers at Crutchfield
OSD Audio Nero Stream WRA Class D 100W IP64 Outdoor Wireless Amplifier | Whole House Audio
Amazon.com: OSD Audio SMP200 Class D Digital Subwoofer Amplifier Rated 200W Max : Electronics
Amazon.com: OSD Outdoor Amplifier WiFi Bluetooth Streaming Class D (100W x 2) Stereo Amp, Free iOS/Android app, EQ Adjustment IP64 Nero Stream WRA : Electronics