The AMP II-S continues the development of Nagra’s Series II family, bringing technologies refined through our HD and Reference electronics to a stereo power amplifier dedicated to musical authenticity. Designed as the natural partner to the PREAMP II-S, it also finds its place in a wide variety of high-end systems.
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Building on the acclaimed Classic AMP, the AMP II-S preserves the natural tonal balance, three-dimensional imaging and effortless musicality that defined its predecessor. More than a decade of additional engineering experience takes these qualities further, revealing greater detail, more precise spatial definition and increased dynamic authority.
At its heart is a new linear power supply built around a custom-made 800 VA potted transformer. Its generous energy reserves and increased voltage headroom give music room to breathe, from the finest instrumental textures to the full impact of an orchestral crescendo. The amplifier delivers 120 W rms per channel into 8 ohms, with the first 10 W operating in Class A. A single pair of MOSFET output transistors per channel preserves the simplicity of the output stage.
A new input board derived from the Reference AMP improves channel separation and spatial precision. Carefully revised circuit layouts, selected internal wiring and optically isolated controls further enhance transparency and clarity.
Equal attention has been paid to mechanical construction. A massive CNC-machined heatsink provides exceptional thermal inertia while minimizing unwanted vibrations. A dedicated transformer suspension further reduces the transmission of mechanical vibrations, supporting the amplifier’s refined musical presentation.
On the front panel, the iconic Modulometer™ reflects Nagra’s recording heritage and creates a distinctive visual connection with the music.
From delicate phrasing to demanding musical peaks, the AMP II-S combines control, openness and ease. A deeper, more articulate bass foundation supports a spacious and revealing presentation, bringing the listener closer to the performance.
Technical specification
ELECTRONICS
| Output power: | 120 W RMS into 8 Ω per channel |
| Input sensitivity: | 1V or 2 V RMS – Selectable |
| Gain: | 29.8 dB For 1 V, 23.8 dB at 2 V |
| Bandwidth: | <10 Hz to 75 kHz +0 / -3 dB |
| Crosstalk: | >90 dB |
| Signal-to-noise ratio: | Typically 110 dB A-weighted |
| THD+N: | < 0.05 % At 120 W |
| Input impedance: | >100 kΩ |
| Output impedance: | 60 mΩ |
| Monitoring: | Stereo Modulometer™ Output power in W into 8 Ω Status LED Operating and protection status |
| Protection mode: | Overtemperature Above 60 °C (140 °F) DC protection Above ±2.5 V Short-circuit Clipping Incorrect mains voltage |
| Power supply types: | 100 V / 115 V / 120 V / 230 V / 240 V ±10 % |
| Power consumption: | PMAX 400 W Less than 1 W (in Standby & REMOTE OFF) |
| Mains fuse: FST 5 x 20 mm |
250 V / T 5 A L 100, 115, 120 V 250 V / T 3.15 A L 230, 240 V |
| Operating temperature: | +15°C to +35°C Moderate climate +59°F to +95°F |
| Operating environment: | Indoor only IP30 |
CONNECTIONS
| Input connectors: | XLR Balanced RCA Unbalanced jack 3.5 mm (1/8”) REMOTE IN |
| Output connectors: | Cardas CPBP Rhodium-plated terminals jack 3.5 mm (1/8”) REMOTE OUT |
GENERAL
| Dimensions: | 461 x 280 x 174 mm / 18.15 x 11.02 x 6.85 in Overall
Add 3cm or 1.2 inches with a VFS plate placed under |
| Weight: | 24.5 Kg (54 lbs) |
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