【Daxia 108 Circuit】Integrated High-End Amplifier D5 /D5 PRO(AP Assisted Design)

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In 2015, the first-generation D5 model with a purely rear-facing design was released.

In 2017, the D5 combined device was launched.

In 2021, the D5PRO hybrid receiver was launched with additional power tubes, increasing the number of parallel power tube pairs per channel from 1 to 3.

Line Characteristics

The "Full Moon Curved Sword" device by Da Xiao Wu features a large feedback circuit for the amplifier.

Moist, soft, comfortable, and pleasing to the ear—this amplifier is perfect for sitting back and listening to music at leisure. Its sound is exceptionally spacious, open, and natural, completely free from harshness, making it truly delightful. The bass delivers impressive depth and richness.

With a high damping coefficient, it allows precise control over any speaker. As a large-loop-free feedback amplifier, it delivers exceptional control performance—definitely worth trying.

MBL pre-amplification circuit, powered by an independent parallel voltage regulator

3-way RCA Signal Input Selection

Production Materials

The D5PRO employs six pairs of precision test pairs, with three pairs per channel, utilizing the ON MJL3281/1302 components for high output current capability.

All small signal lines and high-current lines within the device utilize Taiwan-made Teflon-free copper wires.

CMC Pure Copper RCA Terminal

A high-end Nippon Steel transformer with a power rating of 500 W is used.

12 large electrolytic capacitors (each with a capacitance of 10,000 µF), designed for high-performance audio applications (ELNA FOR AUDIO).

The rear stage employs a dual-channel-to-monochrome design, with separate power supplies for the left and right channels, achieving extremely high separation performance.

Equipped with soft-start functionality upon startup and a comprehensive speaker protection circuit.

CNC CNC-machined all-aluminum high-precision chassis, dimensions: 430*330*130 mm

The front-end section employs a rear-mounted ALPS27 potentiometer.

The front-end stage employs a single operational amplifier (OPA828) for signal amplification.

AP Test Parameters: Test data for each channel under a 8Ω,800W load.

Output valid value: 30.68 Vrms

Channel gain: 37.13 dB, 70.2 times

Signal-to-noise ratio: 108.5 dB

Dynamic Range: 108.5 dB

THD Distortion: 0.0033%

THD+N distortion: 0.010%

Frequency response bandwidth: ±0.046 dB

Amplifier weight: 16 kg; including packaging: 17 kg

Static Power Consumption: D5 – 85 W; D5PRO – 90 W

Output power: 120W × 2/8Ω; 240W × 2/4Ω â€“ effortlessly drives large speakers.

Quality Assurance and After-Sales Service

To ensure quality, each complete unit undergoes comprehensive AP testing to meet all design specifications.

The tests include: bandwidth, noise (signal-to-noise ratio), dynamic range, distortion, intermodulation distortion, channel separation, and gain.

The entire device underwent a 72-hour stress test; the power amplifier was tested under full load (8 ohms) for 1 hour, followed by over 1 hour of audio playback testing.

The entire unit comes with a 1-year warranty, and repairs can be performed at the original cost for life.

The entire device supports a 15-day trial period. You need to cover the round-trip shipping costs.The distortion at full power of this device is as low as 0.003%.The D5 uses a pair of tube amplifier boards.The three-pair tube amplifier board used in the D5ProThe combined device features a high-quality pre-amplification stage:

Utilizes the classic MBL6010 pre-stage core amplification circuit

The operational amplifier OPA604AP utilizes a tube-based sound quality for its audio output.

The ALPS27 potentiometer is positioned at the rear, shortening the signal path and reducing noise.

The potentiometer extension rod ensures a short signal transmission path, thereby reducing interference.

The front-end stage is powered by a Class A parallel voltage regulator with excellent transient response and extremely low noise levels.

OMRON Relay Signal Switching

CMC High-Quality RCA Terminal

After-stage circuitry: The main amplification circuit of this system is derived from the renowned 130,000-Swiss-Franc model "Dartzeel NHB-108" (also known as the "Crescent Moon Sword"). The main amplifier board replicates the original unit exactly at a 1:1 ratio, with all component models and parameters identical to those of the original, ensuring sound quality that matches verbatim.The DaXiao 108 amplifier employs a large-loop-free feedback circuit design, completely eliminating the impact of speaker back electromotive force on the amplifier performance.The sound is natural and comfortable, with strong control.The highly acclaimed NHB-108 patented minimalist broadband circuit features a groundbreaking design that delivers powerful current output and exceptional JI ZHI sound quality.There is no global negative feedback; neither the input nor output stages contain any negative feedback or compensation networks, featuring a unique open-loop design for the output stage.Each polarity along the entire signal path contains only six transistors.

D5PRO combined device AP test with an 8-ohm, 800 W load test