Package:
Power Amplifier *1
No Power Adapter Included
Instructions:
D400B is a new digital amplifier that combines sleek design and premium sound quality. It boasts powerful functionality, robust output, and exceptional audio performance, complemented by a classic analog meter that balances retro aesthetics with modern style.
The D400B is built with premium components: gold-plated RCA connectors for enhanced durability, a large heatsink for stable long-term operation, and high-capacity filter capacitors for cleaner, more stable power delivery with lower ripple. It features the Texas Instruments TPA3223 amplifier chip, capable of delivering 200W per channel, paired with a JRC5532 op-amp in a socketed design that allows for easy upgrades to higher-grade op-amps. The Bluetooth section uses a QCC3034 module with aptX HD lossless transmission support, backed by a PCM5102 Bluetooth decoder to deliver wired-comparable sound quality over wireless connections.
Usage Instructions:
1.The D400B output is only compatible with passive speakers. Do not connect it to active speakers or constant-voltage speakers.
2.The amplifier is powered by DC 24V-42V. Output power increases with voltage, but do not exceed 42V as this will damage the unit. The power connector is 5.5*2.5mm (center positive, outer negative).
3.Do not connect the negative terminals of the left and right speaker outputs together, as this will destroy the amplifier.
To connect via Bluetooth, search for the device named "YJHIFI" and pair.
Specificatons:
Model: D400B
Inputs: RCA, Bluetooth
Amplifier Chip: TPA3223
Bluetooth Version: Bluetooth 5.1
Frequency Response: 20 Hz - 20 kHz
Power Supply: DC 24V-42V
Bluetooth Chip: QCC3034
Bluetooth Decoder Chip: PCM5102
Output Power: 200W × 2 / 4Ω (measured at 42V)
Total Harmonic Distortion (THD): 0.5%
Compatible Speakers: 10W~200W, 4Ω / 8Ω
Bluetooth Range: 10 meters
Protection Features: Reverse polarity protection, short-circuit protection, auto-recovery thermal protection
Weight: 850g
Dimensions: 135mm × 156mm × 46mm
DC Power Jack: 5.5×2.5mm
