The McIntosh MA9000 is a powerhouse integrated amplifier delivering 300 watts per channel into 2, 4, or 8-ohm speakers using patented Autoformer technology. It features a comprehensive suite of 10 analogue and 6 digital inputs, an 8-band equalizer, and the upgradeable DA1 Digital Audio Module. McIntosh +4 Core Performance Specs Power Output: 300 Watts per channel into 2, 4, or 8 Ohms. Total Harmonic Distortion (THD): 0.005% maximum from 20Hz to 20kHz. Dynamic Headroom: 1.8dB. Frequency Response: 20Hz to 20kHz (+0, -0.5dB) and 10Hz to 100kHz (+0, -3dB). Signal to Noise Ratio: 98dB for High Level inputs; 114dB for the Power Amp input. McIntosh +5 Connectivity and Audio Support The unit is designed to be a central hub for all audio sources, including high-resolution digital files and vinyl. Analogue Inputs: Includes 2 Balanced (XLR), 6 Unbalanced (RCA), 1 Moving Coil (MC) phono, and 1 Moving Magnet (MM) phono input. Digital Module (DA1): Houses 2 Coaxial, 2 Optical, 1 USB, and 1 proprietary MCT input for McIntosh SACD/CD transports. Hi-Res Support: The USB input supports PCM up to 32-bit/384kHz, DSD256, and DXD 384kHz. Coaxial and optical inputs support up to 24-bit/192kHz. Headphone Output: Features a 1/4" High Drive jack with Headphone Crossfeed Director (HXD) to improve soundstage depth. McIntosh +6 Physical and Build Details Dimensions: 44.5cm wide x 24cm high x 55.88cm deep (including connectors). Weight: 101 lbs (45.8 kg) net; 134 lbs (60.8 kg) in the shipping carton. Aesthetic Features: Signature blue power meters, black glass front panel, and McIntosh Monogrammed Heatsinks. Tone Control: A discrete, 8-band analog equalizer centered at 25Hz, 50Hz, 100Hz, 200Hz, 400Hz, 1kHz, 2.5kHz, and 10kHz. McIntosh +5 Protective Technologies Power Guard: A real-time circuit that monitors the sound wave and adjusts it to prevent clipping and speaker damage. Sentry Monitor: A fuse-less short-circuit protection system that disengages the output stage before current exceeds safe levels. Thermal Protection: Built-in circuits and Monogrammed Heatsinks manage heat to maintain performance without warm-up lag.