General Specifications
Description Reference Dual-Monaural Preamplifier
Frequency Response 10Hz – 40kHz (±0.2dB)
Frequency Response (Phono) ±1dB (RIAA response)
Input Impedance Input Impedance (line-level) 100k ohms -- Input Impedance (phono) Resistive 3.3Ω, 5.0Ω, 7.7Ω, 10Ω, 33Ω, 50Ω, 77Ω, 100Ω, 330Ω, 47kΩ, (user-selectable) Capacitive 50pF, 100pF, 150pF, 200pF, 250pF, 300pF, 350pF, 0.01μF (user-selectable)
Height 8.75" (22.2 cm) - Control = 3.25" (8.2 cm); Audio = 5.5" (14 cm)
Width 17.25" (43.8 cm)
Depth 13" (33 cm)
Weight 60 lb (27 kg) Control = 25 lb (11 kg); Audio = 35 lb (16 kg)
Phono Inputs Input Overload (phono) >100mV @1kHz (40dB gain); >10mV @1kHz (60dB gain)
Communication and Control Volume Control Range 80.0dB
Analog Audio Inputs 3 balanced (female XLR) stereo inputs; 4 single-ended (Mark Levinson-RCA) stereo inputs
Analog Audio Outputs 1 balanced (male XLR) stereo main output; 1 single-ended (Mark Levinson-RCA) stereo main output; 2 single-ended (Mark Levinson-RCA) stereo record outputs
Maximum Output Level 16V – balanced (XLR) connectors; 8V – unbalanced (RCA) connectors
Signal-to-Noise Ratio Residual Noise < 120dB (20Hz – 20kHz, input terminated,balanced)
Gain Gain (line-level stage) 0dB, +6dB, +12dB, or +18dB (user-selectable) -- Gain (phono stage) +40dB, +60dB @1kHz (user-selectable) -- Gain Resolution 1.0dB increments up to 23.0dB on display (–57dB to –80dB); 0.1dB increments above 23.0dB on display (0dB to –57dB)
Output Impedance 20 ohms – balanced (XLR) connectors; 10 ohms – unbalanced (RCA) connectors
Power Requirements Operating Voltage 100V – 240VAC, 50Hz/60Hz
Audio Specifications
Description Reference Dual-Monaural Preamplifier
Frequency Response 10Hz – 40kHz (±0.2dB)
Frequency Response (Phono) ±1dB (RIAA response)
Input Impedance Input Impedance (line-level) 100k ohms -- Input Impedance (phono) Resistive 3.3Ω, 5.0Ω, 7.7Ω, 10Ω, 33Ω, 50Ω, 77Ω, 100Ω, 330Ω, 47kΩ, (user-selectable) Capacitive 50pF, 100pF, 150pF, 200pF, 250pF, 300pF, 350pF, 0.01μF (user-selectable)
Height 8.75" (22.2 cm) - Control = 3.25" (8.2 cm); Audio = 5.5" (14 cm)
Width 17.25" (43.8 cm)
Depth 13" (33 cm)
Weight 60 lb (27 kg) Control = 25 lb (11 kg); Audio = 35 lb (16 kg)
Phono Inputs Input Overload (phono) >100mV @1kHz (40dB gain); >10mV @1kHz (60dB gain)
Communication and Control Volume Control Range 80.0dB
Analog Audio Inputs 3 balanced (female XLR) stereo inputs; 4 single-ended (Mark Levinson-RCA) stereo inputs
Analog Audio Outputs 1 balanced (male XLR) stereo main output; 1 single-ended (Mark Levinson-RCA) stereo main output; 2 single-ended (Mark Levinson-RCA) stereo record outputs
Maximum Output Level 16V – balanced (XLR) connectors; 8V – unbalanced (RCA) connectors
Signal-to-Noise Ratio Residual Noise < 120dB (20Hz – 20kHz, input terminated,balanced)
Gain Gain (line-level stage) 0dB, +6dB, +12dB, or +18dB (user-selectable) -- Gain (phono stage) +40dB, +60dB @1kHz (user-selectable) -- Gain Resolution 1.0dB increments up to 23.0dB on display (–57dB to –80dB); 0.1dB increments above 23.0dB on display (0dB to –57dB)
Output Impedance 20 ohms – balanced (XLR) connectors; 10 ohms – unbalanced (RCA) connectors
Power Requirements Operating Voltage 100V – 240VAC, 50Hz/60Hz

Mark Levinson No.52 Reference Preamplifier (demo, condition 8/10)

Description	Reference Dual-Monaural Preamplifier
Frequency Response	10Hz – 40kHz (±0.2dB)
Frequency Response (Phono)	±1dB (RIAA response)
Input Impedance	Input Impedance (line-level) 100k ohms -- Input Impedance (phono) Resistive 3.3Ω, 5.0Ω, 7.7Ω, 10Ω, 33Ω, 50Ω, 77Ω, 100Ω, 330Ω, 47kΩ, (user-selectable) Capacitive 50pF, 100pF, 150pF, 200pF, 250pF, 300pF, 350pF, 0.01μF (user-selectable)
Height	8.75" (22.2 cm) - Control = 3.25" (8.2 cm); Audio = 5.5" (14 cm)
Width	17.25" (43.8 cm)
Depth	13" (33 cm)
Weight	60 lb (27 kg) Control = 25 lb (11 kg); Audio = 35 lb (16 kg)
Phono Inputs	Input Overload (phono) >100mV @1kHz (40dB gain); >10mV @1kHz (60dB gain)
Communication and Control	Volume Control Range 80.0dB
Analog Audio Inputs	3 balanced (female XLR) stereo inputs; 4 single-ended (Mark Levinson-RCA) stereo inputs
Analog Audio Outputs	1 balanced (male XLR) stereo main output; 1 single-ended (Mark Levinson-RCA) stereo main output; 2 single-ended (Mark Levinson-RCA) stereo record outputs
Maximum Output Level	16V – balanced (XLR) connectors; 8V – unbalanced (RCA) connectors
Signal-to-Noise Ratio	Residual Noise < 120dB (20Hz – 20kHz, input terminated,balanced)
Gain	Gain (line-level stage) 0dB, +6dB, +12dB, or +18dB (user-selectable) -- Gain (phono stage) +40dB, +60dB @1kHz (user-selectable) -- Gain Resolution 1.0dB increments up to 23.0dB on display (–57dB to –80dB); 0.1dB increments above 23.0dB on display (0dB to –57dB)
Output Impedance	20 ohms – balanced (XLR) connectors; 10 ohms – unbalanced (RCA) connectors
Power Requirements	Operating Voltage 100V – 240VAC, 50Hz/60Hz