Since I wasn't able to find a discussion thread on this amplifier I thought I'd create this thread to talk about it.
Reference Amplifier with unprecedented transparency and precision, attention to detail and massive power performance. Rich feature set for both high-end enthusiasts and professional users. Designed and manufactured in Germany.

Inputs/Outputs
Line Inputs balanced – Impedance 20KΩ – max. level +23dBuLine Outputs balanced – Impedance 47Ω – max. level +23dBu
transformer-like behaviour: hot or cold may be connected to ground without loss
Line Inputs unbalanced – Impedance 20KΩ – max. level +23dBu
Line Outputs unbalanced – Impedance 47Ω – max. level +23dBu
Headphones Output
Impedance Class A 0,8Ω, Class A & Servo 0,045Ωmax. level +23,5dBu (+/-16,5V)
Output Power per Side
RMS 4W/30Ω; 7W/15ΩPeak 7,6W/30Ω; 11W/15Ω; 12W/10Ω (18W for 1,5ms)
Frequency Response
10Hz ... 30kHz -/+0,05dB1Hz ... 500kHz better than -3dB at Headphones Output @ +6dBu
Gain
Line/Line – 0dB – +15dB switchable on rear panelLine/Headphones – +6dB – +15dB switchable on rear panel
Noise
20Hz ... 20kHz flat RMS / A or B activeXLR/RCA Output -102dBu
Headphones Output -97dBu
Headphones Output THD (Total Harmonic Distortion)
Class A 0,07% – Class A & Servo 0,0005%(typ. @ +20dBu/7,75Veff / 30Ω load / 2W RMS)
Power Supply
Mains Voltage – AC 50-60Hz, switchable 100V / 110V / 120V / 220V / 230V / 240VPower Consumption – typ. 40W, max. 60W
Measures and Weights
HM1: WxHxD approx. 225 x 90 x 300mm, approx. 5kgHMP1 (Mains Adapter): WxHxC approx. 170 x 60 x 185mm, approx. 1,2kg
More infos at: https://hm1.zaehl.com/en/
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