The Marantz Model 50 is the flagship integrated amplifier in Marantz’s 50 series, sitting above the CD 50n network CD player as the centrepiece of a pure analogue stereo system. Succeeding the long-running PM6007, the Model 50 marks a significant step forward in Marantz’s approach to two-channel amplification, moving to a current feedback topology with custom HDAM SA3 modules — a technology previously reserved for Marantz’s higher-end models.
Amplifier Design
At the heart of the Model 50 is a Class A/B amplifier delivering 70 watts per channel into 8 ohms, rising to 100 watts into 4 ohms. The current feedback topology, paired with Marantz’s proprietary HDAM SA3 (Hyper Dynamic Amplifier Module) circuits, provides exceptional current delivery with total harmonic distortion of just 0.02% and a damping factor of 100. This architecture was specifically selected by the Marantz Sound Master for its ability to combine authority with musical nuance.
Power Supply
The Model 50 employs a toroidal power transformer — a relatively unusual choice for Marantz at this price point — paired with a linear drive power supply. A triple-layer bottom plate provides additional isolation from mechanical vibration, contributing to the amplifier’s low noise floor.
Inputs and Connectivity
As a purely analogue design, the Model 50 forgoes digital inputs entirely. It offers six analogue inputs: four line-level connections (CD, Tuner, Line, Recorder), a dedicated moving magnet phono stage, and a power amplifier direct input for use with an external preamplifier. The built-in MM phono stage uses a new circuit design without distortion-inducing coupling capacitors, with RIAA deviation of ±0.5 dB across 20 Hz to 20 kHz.
Outputs and Flexibility
The Model 50 features a stereo preamplifier output and a dedicated subwoofer output (220 mV), allowing it to serve as the hub of a more complex system. Marantz’s SPKT-1+ speaker terminals support A/B speaker switching, enabling two pairs of loudspeakers to be connected simultaneously. A front-panel headphone output is also included.
Design and Build
The Model 50 continues Marantz’s signature aesthetic with symmetrical front-panel layout, a low-noise OLED display, and tactile rotary controls. The amplifier weighs 14.2 kg and measures 442 × 431 × 130 mm (W×D×H). It is available in Black and Silver Gold finishes.
| Amplifier Type | Class A/B with Current Feedback Topology |
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| Power Output (8Ω) | 70W per channel |
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| Power Output (4Ω) | 100W per channel |
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| Total Harmonic Distortion | 0.02% |
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| Frequency Response | 5 Hz – 100 kHz (±3 dB) |
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| Damping Factor | 100 |
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| S/N Ratio (CD/Line) | 113 dB (IHF-A) |
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| S/N Ratio (Phono MM) | 87 dB (IHF-A) |
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| Input Sensitivity (CD/Line) | 185 mV / 16 kΩ |
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| Input Sensitivity (Phono MM) | 1.4 mV / 47 kΩ |
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| RIAA Deviation | ±0.5 dB (20 Hz – 20 kHz) |
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| Audio Inputs | 6 (CD, Tuner, Line, Recorder, Phono MM, Power Amp In) |
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| Pre Out | 1.5 V |
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| Subwoofer Out | 220 mV |
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| Speaker Terminals | Marantz SPKT-1+ (A/B switching) |
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| Headphone Output | Yes |
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| Tone Control | Bass ±10 dB (50 Hz), Treble ±10 dB (15 kHz) |
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| Power Consumption | 220W (0.3W standby) |
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| Dimensions (W×D×H) | 442 × 431 × 130 mm |
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| Weight | 14.2 kg |
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| Also Available As | Black |
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