O-NOORUS D4 PRO, a TPA3255 Hi-Fi stereo amplifier with HDMI eARC/ARC, Bluetooth 5.0, USB, optical, coaxial and RCA inputs, HPF/LPF crossover, and 3-band EQ for TV and desktop audio.

Specifications：Model: D4 PROTHD: ≤ 0.004% @1KHz 5WSNR: ≥ 93dB @1KHz 5W SNR: ≥ 106dB @1KHz 120W SINAD: 90dB @1KHz 5WInput Mode: Balance/RCA/HDMI ARC / BLUETOOTH/ USB /Optical/ Coaxial Power Supply: 36V5A/48V5A/NO POWERWorking Voltage: 24V~ 48VTerminating Impedance: 2-8ΩFrequency Range: 20Hz - 20kHzOutput Mode: Passive speakers/Active subwoofer Package Include:O-NOORUS D4 PRO Amplifier*148V5A/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