Fostex RM-3 Rackmount 20W Speaker System RM-3 B&H Photo Video
1U Rack Mount Speakers RK1007
Auratone 5RMC rack mount monitor — Big "D" Broadcast Exchange
Amazon.com: Pyle 8-Channel Wireless Bluetooth Power Amplifier - 4000W Rack Mount Multi Zone Sound Mixer Audio Home Stereo Receiver Box System w/ RCA, USB, AUX - For Speaker, PA, Theater, Studio/Stage -