Specifications：
Model: D4 PRO
THD: ≤ 0.004%  @1KHz 5W
SNR: ≥ 93dB @1KHz 5W      SNR: ≥ 106dB @1KHz 120W 
SINAD: 90dB   @1KHz 5W
Input Mode: Balance/RCA/HDMI ARC / BLUETOOTH/ USB /Optical/ Coaxial 
Power Supply: 36V5A/48V5A/NO POWER
Working Voltage: 24V~ 48V
Terminating Impedance: 2-8Ω
Frequency Range: 20Hz - 20kHz
Output Mode: Passive speakers/Active subwoofer

Package Include:
O-NOORUS D4 PRO Amplifier*1
48V5A/48V10A/NO POWER(Optional)
User Manual*1

Mini amplifier, Multiple inputs, Custom Tone, Big Power, Low Distortion

--TPA3255+PFFB technology, full-frequency low distortion, driving audiophile-grade speakers.

--Full-scenario interconnection: HDMI ARC synchronizes TV volume, Bluetooth 5.3/optical fiber/coaxial /RCA/USB multi-input, creating 2.1 channels.

Customizable Sound

--Free customization of tone｜Interchangeable op amp  3-band EQ tone  ±12dB adjustment, precise adjustment of vocals/low frequency.

--BASS, MID, TREBLE for 100Hz, 1000Hz, 10000Hz frequency bands respectively independent adjustment (±12dB) 

Main output with high-pass filter and bypass

60Hz high-pass filter parameters： 

5th order Butterworth; 60Hz passband; Stopband: Fs: 45Hz, Asb: -12.00 dB

80Hz high-pass filter parameters： 

5th order Butterworth; 80Hz passband;  Stopband: Fs: 60 Hz, Asb: -12.00 dB

120Hz high-pass filter parameters： 

5th order Butterworth; 120Hz passband;  Stopband: Fs: 90 Hz, Asb: -12.00 dB