O-NOORUS D3 PRO TPA3255 PFFB Stereo Amplifier and Decoder with HDMI ARC Bluetooth5.4 USB Optical Coaxial RCA input
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1、Hardware configuration
Decoding core: AKM AK4493S flagship DAC chip, supports PCM 768kHz / DSD512 native hardware decoding
Amplifier module: TI TPA3255 PFFB, output power 2×300W@4Ω (high efficiency and low distortion)
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
Sound control system: NJW1194 electronic volume chip, supports ±10dB high and low bass adjustment
2、Input interface
Digital input:
USB (Type-B USB1: PC/mobile phone decoding; Type-A USB2: USB flash drive direct reading)/HDMI ARC (TV audio return.) /Optical/coaxial (SPDIF, supports 24bit/192kHz)
Analog input:RCA (input/output multiplexing)
Wireless input:Bluetooth 5.4 (aptX Lossless transmission, delay <50ms)
3、Output interface
Main channel: stereo output (20Hz-20kHz full frequency band)
Low pass filter: independent subwoofer interface (40-200Hz adjustable, crossover point can be set)
RCA multiplexing: converted 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)
5、RCA Technical Parameters
5.1 RCA @4Ω 5W
5.2 RCA @4Ω 110W
5.3 RCA 4ohm 5W Signal to Noise Ratio
5.4 RCA 4ohm 110W Signal to Noise Ratio
6, XMOS USB Technical Parameters
6.1 USB @4Ω 5W
6.2 USB @4Ω 110W
6.3 USB 4ohm 5W Signal to Noise Ratio
6.4 USB 4ohm 110W Signal to Noise Ratio
7. PFFB 4ohm and 8 ohm frequency response
8. Noise FFT