Sansui MOSFET Class A | Duo Stage NF Circuit Quad/Stereo Channel QRX-3000 Amplifier w/ Phono Stage SOLD

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RARE FIND at THIS CONDITION! Limited Production Globally 🤩
这样完美的稀有珍品！限量生产🤩  

NOW ONLY RM SOLD! 🤯 You CAN HAVE IT on your HIFI Rack!🤩 SHOW IT OFF ~
现在只需 RM SOLD🤯！ 你就可以拥有它，放在你的音响架子上🤩！炫一炫它〜
CONDITION 品像: 7.5/10 = Great | 很好

Pure Class A Fully Discrete Phono Stage & Input Stage 
Pure Japan Craftmanship using Local Voltage 220V~240V
Real Wood Chassis w/ Silver Knobs & Face Plate
纯Class A全分立唱头放大器和输入阶段
纯正日本工艺，使用本地电压220V~240V  
实木机箱，配银色旋钮和面板

QS Barrio Matrix Circuit - QS Barrio 矩阵电路
Phase Discriminator - 相位鉴别器
Dual-Gate MOS FET - 双门MOS场效应晶体管
2-Stage Direct NF Circuit - 二级直流噪声抑制电路
Ceramic Filter with Four Elements - 四元素陶瓷滤波器

The Sansui QRX-3000 delivers a warm, rich, and engaging sound signature characteristic of vintage Sansui gear, with excellent separation and clarity in both 2-channel and 4-channel modes. Its balanced mids, detailed highs, and deep, controlled bass make it versatile for various music genres and suitable for both casual and critical listening. While its power output may be modest by modern standards, it performs exceptionally well in small to medium-sized rooms when paired with well-matched speakers. Proper restoration or servicing may be required to unlock its full potential, ensuring an authentic and immersive listening experience.

Sansui QRX-3000 展现了典型的复古Sansui音质，音色温暖丰富，2声道和4声道模式下均具备出色的分离度和清晰度。中音平衡，高音细腻，低音深沉且控制良好，适用于各种音乐风格，适合休闲和严谨的聆听需求。尽管其功率输出相较现代标准略显不足，但与匹配的音箱搭配使用时，在小到中型房间内表现出色。若经过适当的修复或保养，将能释放其全部潜力，带来真实且沉浸的聆听体验。
~ Reviewers from Audio Forums

SOUND QUALITY REVIEW（音色评测）:🤩
- Warm, rich sound typical of vintage Sansui equipment.  
- Excellent separation and clarity in both 2-channel and 4-channel modes.  
- Balanced mids, detailed highs, and deep, well-controlled bass.  
- Performs well with a variety of music genres.  
- Smooth and engaging listening experience, especially for analog sources.  
- Suitable for both casual and critical listening.  
- Slightly limited power output by modern standards but sufficient for small to medium-sized rooms.  
- Requires well-matched speakers to fully showcase its capabilities.  

- 温暖、丰富的声音，典型的Sansui复古设备音质。  
- 在2声道和4声道模式下均具备出色的分离度和清晰度。  
- 中音平衡，高音细腻，低音深沉且控制良好。  
- 适用于多种音乐风格。  
- 平滑且令人愉悦的聆听体验，尤其适合模拟音源。  
- 适合休闲和严谨的聆听需求。  
- 功率输出相较现代标准略有限，但足以满足小到中型房间使用。  
- 需要与匹配的音箱搭配使用，才能充分展现其性能。  
- 由于年代久远，可能需要修复或保养以达到最佳性能。  

DESIGN & TECHNOLOGY 设计与科技:
- Incorporates the Sansui QS Regular Matrix System with QS Vario-Matrix and QS Synthesizer for full 4-channel audio capabilities.  
- Features a QS Barrio Matrix Circuit that enhances sound separation, clarity, and natural sound field generation through real-time control of matrix coefficients.  
- Uses phase discrimination technology to detect and adjust signal phases for improved audio separation and directional clarity.  
- Integrated 100-watt 4-channel stereo amplifier for powerful performance.  
- Equipped with an FM/AM 4-channel stereo tuner featuring dual-gate MOS FET, a 3-row varicon, and ceramic filters for high sensitivity and selectivity.  
- 2-stage direct NF circuit in the equalizer amplifier enhances sound quality and reduces distortion.  
- Constant voltage circuit in the power supply ensures stability and reliability.  
- Includes various 4-channel control functions and effects for customizable playback.  
- Functional design with tone control, loudness switch, balance control, and high/low filters.  
- Versatile headphone jack allows separate use for front and rear channels.  
- Equipped with a precision tuning knob, tape monitor switch, FM muting, and selector switches for enhanced user experience.

- 集成了Sansui QS常规矩阵系统，配备QS可变矩阵和QS合成器，实现完整的4声道音频功能。  
- 配备QS Barrio矩阵电路，通过实时控制矩阵系数，增强了声音分离度、清晰度和自然声场的生成。  
- 采用相位鉴别技术检测并调整信号相位，以改善音频分离度和方向性清晰度。  
- 内置100瓦4声道立体声功放，提供强劲性能。  
- 配备FM/AM 4声道立体声调谐器，采用双栅MOS FET、三排变量电容器和陶瓷滤波器，实现高灵敏度和高选择性。  
- 均衡放大器中采用两级直接负反馈电路，提高音质并减少失真。  
- 电源采用恒压电路，确保稳定性和可靠性。  
- 包含多种4声道控制功能和效果，可实现个性化播放。  
- 具备音调控制、响度开关、平衡控制及高/低滤波器等功能性设计。  
- 多功能耳机插孔支持前后声道独立使用。  
- 配备精密调谐旋钮、磁带监听开关、FM静音及选择开关，提升用户体验。  

SPECIFICATIONS 规格:🧾
- Type: 4-channel receiver  
- Synthesizer Unit: Synthesizer / decoder with Sansui QS Regular Matrix Circuit (built-in QS Barrio matrix circuit)  
- Pre-Main Amplifier Section:  
  - Music power (IHF, 1 kHz): 100W (4 Ω)  
  - Effective power:  
    - 15W/15W/15W/15W (8 Ω, each channel operation, 1 kHz)  
    - 8W + 8W + 8W + 8W (8 Ω, 4 ch operation, 20 Hz to 20 kHz)  
  - Total harmonic distortion factor (at rated output): Not more than 0.5%  
  - Intermodulation distortion factor (at rated output): 0.5% or less (70 Hz : 7 kHz = 4 : 1 SMPTE)  
  - Power Band Width (IHF): 20 Hz to 30 kHz  
  - Frequency characteristic: 30 Hz to 30 kHz  
  - Input Sensitivity / Impedance: Phono - 2.5mV/50k Ω (1 kHz at rated output)  
  - Phono maximum allowable input: 100 mV (total harmonic distortion rate 0.5% or less)  
  - Hum and noise (IHF): Phono - 70 dB or more  
- FM Tuner Section:  
  - Sensitivity (IHF): 2.5 μV  
  - Selectivity: 50 dB or more  
  - Total harmonic distortion factor:  
    - Mono: 0.5%  
    - Stereo: 0.8%  
  - Signal-to-noise ratio:  
    - Mono: 60 dB or more  
  - Stereo separation: 35 dB or more (1 kHz)  
  - Capture Ratio (IHF): 2.5 dB or less  
  - Image rejection: 45 dB or more  
- AM Tuner Section:  
  - Sensitivity: 50 dB/m (bar antenna)  
  - Selectivity: 25 dB or more  
- General:  
  - Semiconductor used:  
    - Transistor: 88  
    - Diode: 50 pcs  
    - FET: 3  
    - IC: 1  
    - Zener diode: 1 unit  
  - Power consumption:  
    - 62W (rated)  
    - 110 VA (max)  
  - External dimensions: Width 505 mm x Height 140 mm x Depth 330 mm  
  - Weight: 11.5 kg  

REFERENCES 根据:🫡
1.https://www.hifiengine.com/manual_library/sansui/qrx-3000.shtml

🤩Can HELP U do 我们可以帮您:
HiFi Setup & Configuration 组装与设置
HiFi System Matching & Pairing 整体搭配
HiFi Tweaking 调音

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🤩Deal Method 交易方式选择：
Option 选择 1: OPEN TO NEGO TIPIS!!! 开放商谈微扣价钱   (BUT NO LOWBALLER 腰砍价勿谈 )
Option 选择 2: OPEN for SWAP & TRADE IN 开放兑换和以旧换新   
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DISCLAIMER 免责声明: 
1. After Audition U LIKE THEN U BOUGHT, No DING DONG here & there, NO EXCUSING Don't like this or that afterwards. (Please be Considerate WE ARE BUSINESS)
2. After Purchase NO REFUND / RETURN. (TRADE IN BACK ALLOWED with Discussed Price)
3. No Compensation AFTER the day unit SOLD, take it home WITHIN THE DAY and TEST ON THE SPOT IMMEDIATELY.
4. NO WARRANTY AS DEFAULT for 2nd Second Products (UNLESS we STATED & VERIFIED in the Description)

1. 试听满意后再购买，买回家自己搭配好好慢慢玩，成交后没必要绕一大圈说不喜欢这个那个。（拜托了解与考虑做生意的角度）
2. 购买后不退货/不退款（允许以商定的价格以旧换新）。
3. 产品售出当天不再提供补偿，请当天提货并立即拿回家开机测试。
4. 二手产品默认无保修（除非我们在描述中明确说明并核实）。