D3 PRO introduction

1、Hardware configuration
Decoding core: AKM AK4493S DAC chip, supports PCM 768kHz / DSD512 native hardware decoding

Amplifier module: TI TPA3255 PFFB (pure feedforward feedback architecture)

Digital interface: XMOS XU316 USB audio solution, supports ultra-low latency asynchronous transmission

Bluetooth chip: Qualcomm QCC3084, compatible with aptX Lossless / LDAC / LC3 and other high-definition encodings

Tone: NJW1194 electronic volume chip, supports ±10dB bass and treble adjustment

2、Input interface
Digital input

USB (Type-B USB1: PC/mobile phone decoding; Type-A USB2: U disk direct reading)

HDMI ARC (TV audio return)

Optical fiber/coaxial (SPDIF, supports 24bit/192kHz)

Analog input

RCA (input/output multiplexing)

Wireless input

Bluetooth 5.3 (aptX Lossless transmission, delay <50ms)

3、Output interface
Main channel: stereo output 

subwoofer :subwoofer interface (40-200Hz adjustable,)

RCA multiplexing: transfer to pre-stage output in non-input state (sound source sharing mode)

4、Working mode

D-F mode (decoding mode, The sound source is output from the DAC, bypassing NJW1194, and the volume is not adjustable)
D-B mode (decoding mode, the sound source is output from the DAC, passing through NJW1194, and the volume is adjustable)
A-F mode (amplifier mode, the sound source is output from the DAC, bypassing NJW1194, and the volume is not adjustable)
A-B mode (amplifier mode, the sound source is output from the DAC, passing through NJW1194, and the volume is adjustable)

In short：When RCA is not used as input, it is output. As output, the sound source is mode shared.

5、Technical Parameters

SINAD/THD+N Ratio /Gain

Signal to Noise Ratio @4 ohms 5W 1KHz

32 Tone Input Signal/5 watt into 4 Ohm

THD+N Ratio

FFT