The Klipsch KA-1000-THX is a Class D subwoofer amplifier custom-matched to the Klipsch KW-120-THX subwoofer, delivering 500 watts RMS into 8 ohms — or up to 1,000 watts into 4 ohms when driving a pair of subwoofers for full THX Ultra2® certified output.
The Klipsch KA-1000-THX is a dedicated Class D subwoofer amplifier, custom-matched to Klipsch’s KW-120-THX passive subwoofer. It’s built for installers and home theater enthusiasts who need high-impact, low-distortion bass output and the flexibility to drive a second subwoofer when a single sub isn’t enough for the room.
The KA-1000-THX delivers 500 watts (mono) RMS into an 8-ohm load, and up to 1,000 watts into 4 ohms when driving two KW-120-THX subwoofers in parallel — the configuration required for full THX Ultra2® certified performance in larger rooms. A massive toroidal power supply transformer backs up the Class D output stage for consistent delivery under demanding bass content.
A continuously variable 40–120Hz low-pass crossover, defeatable THX and boundary-gain compensation switches, adjustable phase control from 0 to 180 degrees, and a signal-sensing auto on/off mode make the KA-1000-THX straightforward to integrate and tune during a professional installation. Two gold-plated RCA line-level/LFE inputs and two pass-through RCA outputs are included alongside two professional SpeakOn NL2 speaker outputs.
I’d invite you to book an appointment at our Ottawa showroom to talk through whether a single or dual KW-120-THX subwoofer setup, powered by the KA-1000-THX, is right for your room. Our team can help plan the crossover and gain settings as part of a full THX Ultra2® installation.
It is custom-matched and recommended specifically for the Klipsch KW-120-THX subwoofer, using professional SpeakOn NL2 connections rather than standard binding posts.
The KA-1000-THX is rated at 500 watts RMS into an 8-ohm load; wiring two KW-120-THX subwoofers in a 4-ohm configuration allows the same amplifier to deliver up to 1,000 watts total, which is the setup required for full THX Ultra2® certified dual-subwoofer performance.
This is a legacy/discontinued item. Klipsch’s published warranty categories don’t list this exact product, so please contact us and we’ll confirm the current applicable warranty term before you buy.
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