Mark Levinson No.5302 Dual Monaural Amplifier The No.53 is not a class-D amplifier. While the original rationale for the class-D technology was its efficiency-lightweight, cool-running amps that could produce a great deal of power-the No.53 is big and heavy, resembling the No.33-and it runs warm even at idle. It weighs 135 lbs, with claimed outputs of 500W RMS into 8 ohms or 1000W into 4 ohms, 20Hz-20kHz, at no more than 0.1% total harmonic distortion. Product Highlights: Frequency Response: Within ±0.1dB from 10Hz to 20kHz Input Impedance: 100 kΩ (balanced); 50 kΩ (unbalanced) Height: 20.87 in (530mm) Width: 8.42 in (214mm) Depth: 20.4 in (518mm) Weight: Net weight: 135 lb (61.3kg); Shipping weight: 165 lb (75kg) Communication and Control: Two Link2 ports (one input and one output); One Ethernet port; One 3.5mm mono (tip/sleeve) mini plug trigger input, 3-12Vdc; One 3.5mm mono tip/sleeve) mini plug trigger output, 3-12Vdc; 3-Pin IEC standard power connector Inputs: One balanced XLR in