EASILY CONNECT TO ALL SCENARIOS

D4 PRO Multi-Scene
Stereo Power Amp

Name: O-NOORUS D4 PRO TPA3255 PFFB Stereo High-pass filter and Low-pass filter Amplifier with Balance HDMI eARC/ARC Bluetooth USB Optical Coaxial RCA input, 3-Band Stereo EQ Tone and Bypass
Brand: Onoorus Audio
Price: 159.00 USD
Availability: InStock

It offers you multi-functionality,multi-scenario applications,

high-pass filter,low-pass filter,and 3-band EQ.

Independent HPF/LPF crossover

Advanced Audio Customization
for Perfect 2.1 Sound

1.Its main output features an adjustable high-pass filter (HPF: 120Hz/80Hz/60Hz/bypass),

which precisely controls the low-frequency limit of the main speakers, resulting in clearer mid-high frequencies.

2.Simultaneously, the subwoofer output is equipped with a matching low-pass filter (LPF: 120Hz/80Hz/60Hz/bypass), perfectly driving the subwoofer.

3.This dual-filter design easily creates a powerful 2.1 channel system, achieving seamless and clear crossover performance.

Main output with high-pass filter and bypass

60Hz high-pass filter parameters：4th order Butterworth; 60Hz passband; Stopband: Fs: 45Hz, Asb: -12.00 dB

80Hz high-pass filter parameters：4th order Butterworth; 80Hz passband; Stopband: Fs: 60 Hz, Asb: -12.00 dB

120Hz high-pass filter parameters： 4th order Butterworth; 120Hz passband; Stopband: Fs: 90 Hz, Asb: -12.00 dB

How does HDMI eARC/ARC streamline the home theater user experience?

The unit features a dedicated HDMI eARC/ARC port fully compatible with Consumer Electronics Control (CEC) for power and volume synchronization. When you use your TV remote to adjust volume or toggle power, the amplifier simultaneously executes the same command in real time. This design eliminates the clutter of multiple remotes and complex cabling, bridging the gap between high-fidelity stereo audio and modern television convenience.

It supports optical and coaxial decoding up to 24-bit/192kHz, meeting the requirements for lossless music playback.

How does the independent HPF/LPF crossover build a flawless 2.1 system?

The main speaker output features an adjustable high-pass filter (HPF: 60Hz / 80Hz / 120Hz / Bypass) engineered with a 4th-order Butterworth circuit to clear low-frequency burdens from your main monitors. Simultaneously, the dedicated subwoofer output utilizes a matching low-pass filter (LPF: 60Hz / 80Hz / 120Hz / Bypass) to isolate deep frequencies. This dual-filter configuration delivers a precise attenuation rate of -12.00 dB at the stopband, ensuring seamless crossover integration and punchy, distortion-free bass.

How do the 3-band EQ and extensive inputs allow for sound customization?

Equipped with an onboard 3-band equalizer chip, the device supports independent Treble, Mid, and Bass adjustments within a range of ±12dB via physical hardware knobs. For purists seeking uncolored audio playback, a one-touch "Bypass" mode completely routes the signal away from the tone circuitry. Furthermore, users can seamlessly toggle between 8 distinct audio input sources—including Bluetooth, USB, Optical, Coaxial, and RCA—to accommodate any source device from PCs to dedicated DACs.

How O-NOORUS D4 Pro is the Ultimate All-in-One Hi-Fi Amplifier Under $160?

The O-NOORUS D4 Pro is a $159.00 TPA3255-powered digital amplifier featuring advanced Post-Filter Feedback (PFFB) technology to deliver an ultra-low distortion audio experience. Delivering up to 200W per channel, it integrates HDMI eARC/ARC, 8 audio input sources, and an independent crossover matrix. It is the most versatile, high-performance solution available for audiophiles building a budget-friendly 2.1 home theater or desktop setup.