№ 523

Dual-Monaural Preamplifier with Phono Stage

驚異的なサウンドクオリティ、最新鋭のインダストリアルデザインも兼ね備えたデュアルモノラル・プリアンプ

伝統の音をさらに磨き上げたクラスAフォノアンプによるアナログディスク再生を実現。高品位アナログ入力に加え、最高水準の音質でのヘッドフォン再生にも対応。オーディオファンの理想に近づき、音楽ファンの希望に応える、マークレビンソンの新世代プリアンプです。

特長

№523 Feature 01

高純度かつハイスピードな信号処理を可能にする伝統のデュアルモノラル・フルバランス設計

マークレビンソン・プリアンプの伝統である回路のシンメトリカル・レイアウトおよびデュアルモノラル構成によるフルバランス設計を継承しています。入力信号は、アンバランス信号も入力直後にインプットステージにおいてバランス化され、後続回路へ伝送。この高度なフルバランス・オペレーション技術により、すべての入力ソースにおける高いコモンモード・ノイズリダクション効果を獲得しています。

№523 Feature 02

Pure Path回路設計

両チャンネルのオーディオ回路のパーツや信号伝送ラインを左右対称に配置するデュアルモノラル構成とすることで、信号処理におけるわずかな劣化やノイズの発生要因をも排除。最先端の素材・素子の採用、シグナルパスの最適化も図ることで、プリアンプの使命である音楽信号の高純度かつハイスピードな伝送を極めて高いレベルで実現しています。

№523 Feature 03

クラスAアンプによる最高音質でのヘッドフォン再生

No523ではマークレビンソン・プリアンプ初のヘッドフォン端子を装備しています。メインオーディオ回路を用いたクラスAアンプによる最高水準の音質でのヘッドフォンによる音楽鑑賞を楽しむことができます。

№523 Additional Feature 01

超精密R-2Rラダー型ステップアッテネータ―・ボリューム

プリアンプの主要機能であり音質への影響度も大きいボリュームコントロール部には、リファレンスプリアンプ譲りのR-2Rラダー型ソリッドステート・ステップアッテネーター・ボリュームを採用しています。超高精度ラダー抵抗とローノイズ・アナログスイッチを組み合わせることにより、信号純度を確保しながら、レベル調整における帯域幅を最大限まで拡大。さらに、左右チャンネル間の音量のマッチング精度を高め、主要調整範囲において0.1dBステップでの微細な音量調整を可能にしています。

№523 Additional Feature 02

アルミニウムIRリモートコントローラー

付属のリモコンも重厚且つ堅牢なアルミニウムを贅沢に使用しています。

№523 Additional Feature 03

妥協のないデザイン

マークレビンソンのアンプづくりの大きな特徴が用いているパーツ群のグレードの高さ。No523においても、音質はもちろんのこと、信頼性、耐久性など様々な点において厳しい基準をクリアしたものを採用。

仕様

ハイライト

高純度かつハイスピードな信号処理を可能にする伝統のデュアルモノラル・フルバランス設計
超精密R-2Rラダー型ステップアッテネータ―・ボリューム
アナログディスクの魅力を最大限に引き出す完全ディスクリート・クラスAフォノイコライザー内蔵
クラスAアンプによる最高音質でのヘッドフォン再生

入力

アナログ入力端子|XLRバランス×2ペア/RCAアンバランス×3ペア/フォノ(MM/MC)×1ペア

出力

アナログ出力端子|プリアウト:XLRバランス×1ペア/RCAアンバランス×1ペア ヘッドホン(φ6.3mm標準)×1

コントロール端子

RS-232 ポート ×1、IR インプット (⅛”/3.5mm ミニジャック) ×1、12V DC トリガーインプット (⅛”/3.5mm ミニジャック) ×1/アウトプット x 2
待ち望んだサウンドに満たされる時間

待ち望んだサウンドに満たされる時間

マークレビンソンを体感しませんか。

№ 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Hero № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Front № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Back № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Detailshot 1 № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Detailshot 2 № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Detailshot 3 № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Detailshot 4 № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Detailshot 5 № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Detailshot 6 № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Detailshot 7 № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Detailshot 8 № 523 - Black - Dual-Monaural Preamplifier for Analog Sources - Detailshot 9

№ 523

NO523

デュアルモノラル・プリアンプ


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.

販売店検索

Detailed Analog Audio

The № 523 includes a high-performance Pure Phono module that’s housed in its own steel enclosure to reduce noise and deliver outstanding performance. Your favorite vinyl albums will never sound better.

Pure Path Circuit Design

Our proprietary approach to circuit design delivers uncompromising musical purity and an engaging listening experience. By using discrete components carefully selected for their precise function, the № 523 delivers unmatched sound quality that captures the nuances of every note.

High-Performance Headphone Output

Unleash all the performance your headphones can deliver. The № 523’s Main Drive headphone output has enough current capability to drive headphones directly, without a separate amp. Enjoy an incredibly detailed personal listening experience — and lose yourself completely in the music.

Details at Any Volume

Mark Levinson’s innovative R-2R ladder volume control provides balanced and consistent sound. Discern subtle details in your music, even at low volume.

Premium Remote Included

Easily control the № 523 with the matching brushed aluminum remote control.

Luxurious Design

Made with lavish materials and meticulously designed, the № 523 exudes elegance and style.

№ 523

The Mark Levinson № 523 is the definitive preamplifier for the analog music lover. Six line-level analog and phono inputs travel through the Mark Levinson proprietary Pure Path discrete, direct-coupled, fully balanced, dual-monaural signal path for breathtaking purity and performance. With precision control including a discrete, balanced R-2R Ladder volume control, class-A Pure Phono stage, and class-A Main Drive Headphone output, the № 523 preamplifier delivers an uncompromising performance regardless of analog source. Housed in a 6000-series aluminum chassis, like all Mark Levinson equipment, the № 523 is designed and handcrafted in the USA.

Mark Levinson Pure Path Circuit Design

Since 1972, Mark Levinson has been dedicated to the uncompromising art of sound, with the guiding principle of musical purity above all else. To achieve that goal like never before, Mark Levinson engineers scoured company archives, ultimately developing a circuit-design philosophy called Pure Path. On a conceptual level, its hallmark principles include a discrete, direct-coupled, fully balanced, dual-monaural signal path that delivers unrestricted, uncompromised sonic purity.

Far from merely arranging high quality components in an intelligent manner, Pure Path is the meeting of science and art: Mark Levinson engineers are tasked to create the best possible measured AND subjective performance. To quote Albert Einstein: “Everything should be made as simple as possible, but not simpler.”

Pure Path highlights in the № 523 include Folded Cascodes, an R-2R Ladder volume control, the class-A Pure Phono stage, and class-A Main Drive Headphone amplifier output.

Analog Mastery: The Folded Cascode

Mark Levinson components are designed around a Pure Path amplifier circuit concept that makes heavy use of a circuit design element called a cascode. Originally created for improving the bandwidth of vacuum tube circuits in radios, Mark Levinson engineers deploy cascodes in Pure Path circuit designs to both improve bandwidth and enhance linearity. A cascode combines two transistors so that they operate as a single composite device that functions like a single transistor, using the wanted characteristics of each component transistor, and rejecting the unwanted characteristics.

Mark Levinson engineers began their design of the preamp gain stage with pairs of JFETs (junction field-effect transistors), chosen for their low noise and high gain. JFETs achieve these characteristics in part by being large, and with their large size comes nonlinear gain – or distortion. To mitigate this, BJTs (bipolar junction transistors) were added to the circuit. The BJTs exhibit very low input impedance and very high output impedance, which translates to excellent bandwidth and linearity. By creating a cascode of the JFETs and BJTs, they created a design with the best characteristics of both sets of devices.

Engineers than connected the output of the cascode to another transistor of the opposite “gender.” Current flows through it in the opposite direction to “turn around” the direction of the signal current. This special connection is called a Folded Cascode and it is a hallmark of the Pure Path circuit: high gain with low noise, wide bandwidth, and excellent linearity.

Superior Volume Control: The R-2R Ladder

The basis of many volume controls is the venerable analog potentiometer – a device with a number of performance drawbacks. The mechanical connection wears out, creating scratching or crackling noises; it is nearly impossible to manufacture an identically performing pair, and mismatches in a stereo pair can cause level imbalances between the two channels; and due to their varied reaction to parasitic capacitances at different volume settings, the sound changes depending on where the volume is set. Rather than attempting to improve upon this flawed design, Mark Levinson engineers abandoned it. Instead, they employed a complex circuit architecture called an R-2R Ladder.

In the R-2R Ladder, a string of resistors, all with identical resistance (R), form the side of the ladder, with another set of resistors forming the rungs, all identically with double the resistance (2R). This unique circuit takes whatever current appears at its input and successively divides it in half at each “rung” of the ladder. Different combinations of “rung” currents can then be selected and added together, precisely delivering nearly any output current, and thereby, volume setting.

An R-2R Ladder is a highly accurate device. The currents through the rungs are determined by fixed resistors, capable of very tight tolerances, able to be closely matched to one another in value. Analog switches “steer” the currents, are precision devices, and have no mechanical contacts to wear out. In short, the R-2R Ladder solves all the problems inherent to potentiometer-based volume controls. That’s why it is a cornerstone of Mark Levinson Pure Path design philosophy.

Military Grade Components

All Mark Levinson equipment employs electronic components carefully chosen for their specific task. Gain-stage JFET pairs have high gain, low noise, low distortion, and because they are encapsulated in the same package, the two devices operate under nearly identical conditions. Capacitors used in critical filtering locations are film types, noted for their consistent performance regardless of temperature and frequency. Finally, resistors in critical gain-setting and feedback locations use tantalum nitride thin-film elements. An extremely costly material, tantalum nitride typically finds use in sensitive military equipment because it is unusually stable with respect to temperature, exhibits very low noise, and is unaffected by magnetic fields. In fine audio equipment, those characteristics make the sound even more revealing and effortless, free of the low-level nonlinearities caused by lesser resistive materials as they heat and cool under dynamic conditions. Housed in an aircraft-grade 6063-T5 extruded aluminum chassis, the № 523 features extremely high build precision, to exceedingly low tolerances.

Pure Phono: Class A for a Classic Medium

Preamplifying from turntable to line level can a difficult task, and it is an area where some equipment makers skimp on components and design. The № 526 and № 523 preamplifiers introduce a new Mark Levinson phono stage, Pure Phono, itself following Pure Path design principles including discrete design, free of op amps. The Pure Phono stage operates exclusively in class A throughout, employing tantalum nitride thin-film resistors polypropylene capacitors with punishingly low tolerances. The Pure Phono stage also contains physically separated channels and balanced inputs for purity.

The Pure Phono stage offers a fixed-gain MM section with five capacitive cartridge-loading settings, and an MC section with three gain settings and 10 resistive cartridge-loading settings. And an ultrasonic filter intelligently compensates for rumble and warping.

Completing the Signal Path

The № 523 offers five line-level analog inputs: two balanced (XLR), three single-ended (RCA), in addition to the Pure Phono (RCA with grounding pin) input. The preamplifier delivers its signal to balanced (XLR) and single-ended (RCA) stereo outputs, as well as a 1/4-inch (6.3mm) Main Drive Headphone output integrated into the front panel metalwork – a first for Mark Levinson.

The Main Drive Headphone amplifier circuit drives up to 32-ohm headphones in class A by employing the main output circuit rather than a secondary signal path: a perfect example of reducing clutter in the circuit design.

A selectable fourth-order, 80 Hz high-pass filter enables seamless integration of a single or dual subwoofers for full-range performance with a wide range of loudspeaker setups.

System-integration connectivity includes Ethernet/IP control, RS-232, USB for monitoring and configuration via web page, plus 12V triggers and an IR input. An included machined metal remote delivers the robust feel and precise control befitting of a component of the preamplifier’s caliber.

Designed and Handcrafted in the USA

Like all Mark Levinson equipment, the № 523 is proudly designed and handcrafted in the USA. A dedicated Engineering Center of Excellence in Shelton, CT houses Mark Levinson engineering and product development, just a state away from small-batch production at Mack Technologies in Westford, MA by a team of craftsmen who bring all Mark Levinson equipment to life.

  • ハイライト&仕様
  • マニュアルダウンロード

№ 523 ハイライト

  • 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

仕様一覧

Line Stage Gain, Normal Gain 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 (2VRMS Single-Ended or 4VRMS Balanced Output) <0.003%
Signal-to-Noise Ratio (REF. To 2VRMS Single-Ended or 4VRMS Balanced, Max Vol.) >115dB @ 1kHz
Crosstalk @ 1KHz <-107dB
Channel Separation Below Noise Floor (>115dB @ 1KHz)
Input Impedance >45kΩ
Output Impedance <80Ω single ended, <160Ω balanced
Maximum Input Level, Normal Gain Setting >10VRMS, single ended, >15VRMS, balanced
Maximum Output Level >11VRMS single ended, >22VRMS balanced
Headphone Output Impedance selectable; <3Ω or 75Ω
Headphone Maximum Output, Low Impedance Setting, 300Ω, 20Hz TO 20KHz, <0.1% THD
Headphone THD+N, 20Hz TO 20KHz, 2V RMS <0.03% @ 30Ω, <0.01% @ 300Ω
RIAA Frequency Response 20Hz to 20kHz, ±0.3dB
Infrasonic Filter Defeatable, 15Hz, 2nd order (12dB/octave)
Moving Magnet Mode, Input Resistance 47 47kΩ
Moving Magnet Mode, Input Capacitance Selectable; 50, 100, 150, 200, or 680pF
Moving Magnet Mode, Gain 40dB @ 1kHz
Moving Magnet Mode, THD+N, 20Hz to 20KHz, 2VRMS Output <0.03%
Moving Coil Mode, Input Resistance selectable; 20, 33, 50, 66, 100, 200, 330, 500, 1000, or 47kΩ
Moving Coil Mode, Input Capacitance 50pF
Moving Coil Mode, Gain Selectable; 50, 60, or 70dB @ 1kHz
Moving Coil Mode, THD+N, 20Hz to 20KHz, 2VRMS Output <0.02%, 50 or 60dB settings, <0.04, 70db setting
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
Mains Voltage 100VAC, 115VAC, or 230VAC, factory set
Power Consumption 0.4W Green Standby, 5W Power Save, 67W Normal Standby, 70W On, idle
Dimensions Height (with feet) 3.75” (10.2cm) Height (without feet) 3.25” (8.9cm) Width 17.25” (43.8cm) Depth 18” (45.7cm)
Net weight 39 lbs (17.7kg)
Shipping weight 58 lbs (26.3kg)

オーディオ仕様

Line Stage Gain, Normal Gain 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 (2VRMS Single-Ended or 4VRMS Balanced Output) <0.003%
Signal-to-Noise Ratio (REF. To 2VRMS Single-Ended or 4VRMS Balanced, Max Vol.) >115dB @ 1kHz
Crosstalk @ 1KHz <-107dB
Channel Separation Below Noise Floor (>115dB @ 1KHz)
Input Impedance >45kΩ
Output Impedance <80Ω single ended, <160Ω balanced
Maximum Input Level, Normal Gain Setting >10VRMS, single ended, >15VRMS, balanced
Maximum Output Level >11VRMS single ended, >22VRMS balanced
Headphone Output Impedance selectable; <3Ω or 75Ω
Headphone Maximum Output, Low Impedance Setting, 300Ω, 20Hz TO 20KHz, <0.1% THD
Headphone THD+N, 20Hz TO 20KHz, 2V RMS <0.03% @ 30Ω, <0.01% @ 300Ω
RIAA Frequency Response 20Hz to 20kHz, ±0.3dB
Infrasonic Filter Defeatable, 15Hz, 2nd order (12dB/octave)
Moving Magnet Mode, Input Resistance 47 47kΩ
Moving Magnet Mode, Input Capacitance Selectable; 50, 100, 150, 200, or 680pF
Moving Magnet Mode, Gain 40dB @ 1kHz
Moving Magnet Mode, THD+N, 20Hz to 20KHz, 2VRMS Output <0.03%
Moving Coil Mode, Input Resistance selectable; 20, 33, 50, 66, 100, 200, 330, 500, 1000, or 47kΩ
Moving Coil Mode, Input Capacitance 50pF
Moving Coil Mode, Gain Selectable; 50, 60, or 70dB @ 1kHz
Moving Coil Mode, THD+N, 20Hz to 20KHz, 2VRMS Output <0.02%, 50 or 60dB settings, <0.04, 70db setting
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
Mains Voltage 100VAC, 115VAC, or 230VAC, factory set
Power Consumption 0.4W Green Standby, 5W Power Save, 67W Normal Standby, 70W On, idle
Dimensions Height (with feet) 3.75” (10.2cm) Height (without feet) 3.25” (8.9cm) Width 17.25” (43.8cm) Depth 18” (45.7cm)
Net weight 39 lbs (17.7kg)
Shipping weight 58 lbs (26.3kg)

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