Zähl HM1 Reference Desktop Headphone Amplifier


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Title Description
Line Inputs Balanced – Impedance 20KΩ – max. level +23d
Unbalanced – Impedance 20KΩ – max. level +23dBu
Line Outputs Balanced – Impedance 47Ω – max. level +23dBu
Unbalanced – Impedance 47Ω – max. level +23dBu
Headphones Output Impedance Class A = 0,8Ω
Class A & Servo 0,045Ω
max. level +23,5dBu (+/-16,5V)
Output Power per Side RMS 4W/30Ω; 7W/15Ω
Peak 7,6W/30Ω; 11W/15Ω; 12W/10Ω (18W for 1,5ms)
Frequency Response 10Hz ... 30kHz -/+0,05dB
1Hz ... 500kHz better than -3dB at Headphones Output @ +6dBu
Gain Line/Line – 0dB – +15dB switchable on rear panel
Line/Headphones – +6dB – +15dB switchable on rear panel
Noise 20Hz ... 20kHz flat RMS / A or B active
XLR/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 / 240V
Power Consumption – typ. 40W, max. 60W
HM1 Headphone Amplifier Weight and Dimensions WxHxD approx. 225 x 90 x 300mm
approx. 5kg
Additional Specifications
Title Description
HM1 Power Supply (HMP1) Weight and Dimensions WxHxD approx. 170 x 60 x 185mm
approx. 1,2kg

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