9-Channel Amplifier Transcendental Performance from Flagship Power Amplifier Rather than simply offering raw power, the PA-MC5501 is engineered to deliver superior dynamic response and outstanding signal purity. Onkyo’s highly efficient push-pull amplification and WRAT suite work to minimize interference, stabilize the voltage, and boost the current across the unit’s electrical system. Components such as the toroidal transformer, large capacitors, and heavy-duty transistors are all designed to handle very high loads. Audiophile-grade parts—such as gold-plated speaker posts and XLR inputs—are used throughout. The result? Instantaneous response to signal gains, extremely low levels of distortion through the dynamic range, and the sort warmth and clarity only a top-shelf analog amplifier can provide. Paired with a matching Onkyo pre-pro unit, the PA-MC5501’s nine channels and bi-amping capability offer extraordinary set-up flexibility to bring you the ultimate in THX® Ultra2™-certified surround sound. FEATURES 220 W/Ch at 6 Ω, 1 kHz, 1 %, 1 Channel Driven, IEC THX® Ultra2™ Certified WRAT (Wide Range Amplifier Technology) Push-Pull Amplification Design with Three-Stage Inverted Darlington Circuitry to Remove Distortion All Discrete Output Stage Circuitry Massive Toroidal Transformer Two Large, Customized, 22,000 μF Capacitors for Effective Power Supply Audio-Tuned Reference Capacitors for Each Channel Large, Custom-Designed Power Transistors to Drive High Currents Low-Impedance Copper Bus Plates for Perfect Ground Potential High-Current, Low-Impedance Circuit Boards with Thick Copper Foil (70 μm) Separate Anti-Vibration Panels Flat, High-Rigidity, Anti-Resonant Chassis Gold-Plated XLR Inputs Machined Solid Brass RCA Inputs Gold-Plated, Color-Coded, Banana Plug-Compatible, Transparent Speaker Posts Multi-Zone Capability (up to Zone 3)* Bi-Amping Capability* 12 V Trigger Input Auto Standby Function Aluminum Front Panel
