Mark Levinson No523 Dual-Mono Preamplifier

The Mark Levinson® № 523 preamplifier is a six-input dual-monaural preamplifier featuring Pure Path circuit design, class-A Pure Phono stage, and configurable balanced, unbalanced, and class-A Main Drive headphone outputs.

Features

• Pure Path discrete, direct coupled, fully balanced, dual-monaural signal path
• Discrete, balanced R-2R Ladder volume control for precision and performance
• Class-A Pure Phono stage with physically separated channels for MC and MM
• Class-A Main Drive Headphone output for up to 32-ohm headphones using main circuit
• Six analog line-level and phono inputs; balanced, single-ended, and headphone outputs
• Selectable fourth-order, 80 Hz high-pass filter allows seamless integration of subwoofers
• Designed and handcrafted in the USA

Specifications

Line stage gain: 13.5 dB balanced, 7.5 dB single-ended 
Input impedance: >45 kΩ
Output impedance: <80 Ω single-ended, <160 Ω balanced
Maximum input level, normal gain setting: >10 V RMS, single-ended, >15 V RMS, balanced
Maximum output level: >11 V RMS single-ended, >22 V RMS balanced
Headphone output impedance: selectable, <3 Ω or 75 Ω
Infrasonic filter: Defeatable, 15 Hz, 2nd order (12 dB/octave)

Moving magnet mode
Input resistance: 47 kΩ
Input capacitance: Selectable; 50, 100, 150, 200, or 680 pF
Gain: 40 dB @ 1 kHz

Moving coil mode
Input resistance: selectable; 20, 33, 50, 66, 100, 200, 330, 500, 1000, or 47 kΩ
Input capacitance: 50 pF
Gain: Selectable; 50, 60, or 70 dB @ 1 kHz

Analog inputs: 2 balanced (XLR), 3 single-ended (RCA) line, 1 single-ended (RCA) phono w/ ground
Analog outputs: 1 balanced (XLR); 1 pair single-ended (RCA), 1 headphone (¼”, 6.3mm TS)
Control connectors: Ethernet (RJ45), RS-232 (RJ12), Trigger In and Out, IR In, USB-A, Mini USB

Dimensions (HWD): 3.75" x 17.25" x 18"

Weight: 39 lb