Amazon.com: Klipsch Reference R-121SW 12” Front-Firing Subwoofer with revamped Spun-Copper thermoformed crystalline Polymer woofers and an All-Digital Amplifier for Premium Sound in Black : Electronics
Klipsch® KA-1000-THX Subwoofer Amplifier | Primetime Audio Video
Klipsch KA-1000-THX Subwoofer Amplifier 1016569 B&H Photo Video