HD Amps vs FM Acoustics LTD FM 1811-MKII
The FM 1811-MKII's power @ 8ω is 500W against the HD Amps's 250W, its signal-to-noise 115 dB against 110 dB, and its thd 0.005% against 0.030%. Both share power @ 4ω (1.0kW).
AI-generated product photo — not official manufacturer imagery.
AmplifiersPower Amplifiers
Estimated price (community-sourced)
$39,995 - $112,500
Around — community and catalog average, updates slowly
About the HD Amps
The Nagra HD AMP is a Swiss-built mono solid-state power amplifier in the HD Line, designed for ultimate high-end systems and capable of driving very demanding loudspeakers with high power and control. It uses a minimalist MOSFET output stage (only six MOSFETs per channel) and a very large linear power supply to deliver up to 250 W RMS into 8 ohms and as much as 1000 W into lower impedances, with around 30 W operating in pure Class A for enhanced musicality. The HD AMP includes Nagra's iconic front-panel Modulometer to monitor output level and status, along with LED indicators for protection and fault conditions such as overheating or saturation.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 250W @ 8Ω
- Power @ 4Ω
- 1.0kW @ 4Ω
- Amplifier Class
- A
- Minimum Impedance
- 4Ω
- Input Sensitivity
- 1.0V RMS
- Input Impedance
- 88Ω
Analog Output
Analog signal output specifications
- THD
- 0.030%
- SNR
- 110 dB
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- XLR, RCA
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 238 × 644 × 542 mm (W × H × D)
- Weight
- 56 kg (123 lbs)
Key Specifications
Power: 250W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions