523· Amplifiers
Six-input dual-monaural preamplifier with a class-A phono stage for MM and MC cartridges, a balanced R-2R ladder volume control and a class-A headphone output. Aimed at analog-focused hi-fi systems that want balanced and single-ended outputs and network control.
- Class-A phono stage for MM and MC cartridges
- Balanced R-2R ladder volume control
- Class-A headphone output on front panel
- 2 XLR + 3 RCA line inputs, plus RCA phono
- XLR and RCA outputs; selectable 80 Hz subwoofer high-pass filter
- Ethernet, RS-232, USB, 12V trigger and IR control
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The № 523 is a line preamplifier built around a discrete, direct-coupled, fully balanced, dual-monaural signal path. Volume is set by a balanced R-2R resistor ladder with analog switches instead of a potentiometer. The chassis is 6063-T5 extruded aluminum, and the unit is designed and assembled in the USA.
A discrete, op-amp-free class-A phono stage sits in its own steel enclosure with separated channels. The MM section has fixed 40 dB gain and five capacitance settings. The MC section offers three gain settings and ten resistive loading values. A defeatable 15 Hz infrasonic filter is included. The front-panel 1/4-inch headphone output runs from the main output circuit in class A, with selectable output impedance, and is specified for headphones up to 32 ohms.
There are two balanced XLR and three RCA line inputs plus the RCA phono input. Outputs are balanced XLR, RCA and the headphone jack. A selectable 80 Hz fourth-order high-pass filter helps integrate one or two subwoofers. Control and integration options include Ethernet/IP, RS-232, USB, 12V triggers, an IR input and a metal remote control.
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Specifications
- Brand
- Mark Levinson
- Model
- 523
- Category
- Hi-fi and home audio › Amplifiers
Inputs
- Analog inputs
- 2 balanced (XLR), 3 single-ended (RCA) line, 1 single-ended (RCA) phono w/ ground
- Input impedance
- >45kΩ
- Maximum input level
- >10VRMS single-ended, >15VRMS balanced
Outputs
- Analog outputs
- 1 balanced (XLR); 1 pair single-ended (RCA), 1 headphone (¼", 6.3mm TS)
- Output impedance
- <80Ω single ended, <160Ω balanced
- Maximum output level
- >11VRMS single ended, >22VRMS balanced
- Headphone output impedance
- selectable; <3Ω or 75Ω
- Headphone THD+N, 20Hz to 20kHz, 2V RMS
- <0.03% @ 30Ω, <0.01% @ 300Ω
Audio
- Line stage gain, normal setting
- 13.5dB balanced; 7.5dB single-ended
- Line stage frequency response, 20Hz to 20kHz
- ±0.02dB
- Line stage frequency response, 0.4Hz to 370Hz
- +0.1 / -3dB
- THD+N @ 1kHz
- <0.003%
- Signal-to-noise ratio
- >115dB @ 1kHz
- Crosstalk @ 1kHz
- <-107dB
- RIAA frequency response
- 20Hz to 20kHz, ±0.3dB
- Infrasonic filter
- Defeatable, 15Hz, 2nd order (12dB/octave)
Phono stage
- MM input capacitance
- Selectable; 50, 100, 150, 200, or 680pF
- MM gain
- 40dB @ 1kHz
- MM THD+N
- <0.03%
- MC input resistance
- selectable; 20, 33, 50, 66, 100, 200, 330, 500, 1000, or 47kΩ
- MC gain
- Selectable; 50, 60, or 70dB @ 1kHz
Connectivity
- Control connectors
- Ethernet (RJ45), RS-232 (RJ12), Trigger In and Out, IR In, USB-A, Mini USB
Power
- Mains voltage
- 100VAC, 115VAC, or 230VAC, factory set
- Power consumption
- 0.4W Green Standby, 5W Power Save, 67W Normal Standby, 70W On, idle
Physical
- Dimensions (with feet)
- Height 3.75” (10.2cm), Width 17.25” (43.8cm), Depth 18” (45.7cm)
- Net weight
- 39 lbs (17.7kg)
- Shipping weight
- 58 lbs (26.3kg)
In the box
- Remote control
- Brushed aluminum remote included