Description

 

A1-888 8th Gen Hi-Fi Amplifier Board, MJL4281/MJL4302, Class AB, Dual Channel, Short & Thermal Protection

Description:
Built for Audiophiles. 8th Generation Officially Launched
- Our mission is to make top-tier products with excellent sound quality, superior build and first-class service. 
- This final version focuses on sound quality improvement with optimized circuitry, upgraded decoupling capacitors, upgraded front-end signal processing chips, and a modified bridge circuit for easier external wiring installation.
- Sound performance is significantly improved by 30%.
- We also optimized the speaker protection circuit with added output short-circuit protection to better safeguard your expensive speakers, making the amp board more stable and reliable.
- The 8th generation upgrade adds decoupling filter capacitors for lower noise and purer sound.

Six Major Functions
- Bridgeable to mono output
- Upgraded output short-circuit protection
- Adjustable midpoint voltage to 0mV
- Overheat protection
- Intelligent temperature-controlled fan
- Dual-chip audio processing

Premium Components
- Great sound requires high-quality materials.
- We use selected imported audiophile-grade audio components.
- Imported green-shell capacitors: specially designed for HIFI amplifiers, high quality and long lifespan.
- German capacitors for Wima: low loss, high stability, natural sound performance.
- US military-grade resistors: high precision, low loss, non-inductive and durable.
- Imported Japanese differential pair tubes: stable performance, reliable quality, transparent and smooth sound.

With proper matching, it can compete with amplifiers worth over ten thousand yuan.
- Treble: transparent and delicate
- Mid-range: bright and smooth
- Bass: deep and powerful

Five Major Upgrades in Final Version
1. Upgraded chip for significantly improved sound quality
2. Upgraded 0mV midpoint voltage adjustment for better stability
3. Added output short-circuit protection
4. Upgraded bridge switch for external wiring
5. Added decoupling capacitors

Product Upgrade Details
- Upgraded 14-pin audio chip combined with dual differential circuit improves overall sound quality by 30%.
- Sound is transparent, sweet, warm, full, layered with strong and controlled bass.
- Added midpoint voltage adjustment circuit, output midpoint voltage stabilized at 0mV, circuit works in balanced and stable state for outstanding natural sound.
- Safety & Reliability: Upgraded dual relays, high-current output, added output and speaker short-circuit protection to avoid damage from accidental short circuits. Also includes delay protection, overheat protection and overload protection.
- Bridge Output: Newly upgraded one-key bridge switching, convenient and practical. Bridge output power is doubled with strong driving force and more transparent sound. Bridge switch supports external wiring installation.
- Imported power amplifier tubes for ON Semiconductor: 16pcs MJL4302/MJL4281, ensuring high power and excellent sound quality.
- Great circuit with premium materials: carefully designed and tuned by professional audio engineers with years of experience.
- Operates in quasi-Class A mode for transparent, warm, tube-like sound, performing close to Class A amplifiers.

Specifications:
- Model: A1-888
- Channel: Dual channel/Bridge mono
- Main power supply: Dual DC ±50–88V (for 35V–62V transformer)
- Speaker protection power: AC 12–18V (independent winding)
- Output power: 8Ω/400W+400W; 4Ω/800W+800W
- Bridge mono power: 1800W at 8Ω
- Distortion: 0.001%
- Frequency response: 10Hz–180kHz
- Speaker impedance: 4–8Ω
- Amplifier type: Ultra Class AB/Quasi-Class A
- Dimensions: 24.5cm (L) × 11.6cm (W) × 8.3cm (H)

Packing List:
- 1 × Power Amplifier Board

Packaging Details:
- Weight: 1.5kg



Note:
- The picture above is for display only. Please refer to the actual product received.