Description:

Versatile Connectivity: D4 offers a comprehensive range of input options, including HDMI ARC, Bluetooth, USB, U disk, optical fiber, coaxial, and RCA, ensuring compatibility with diverse audio sources and user preferences.

High-Fidelity Audio: Utilizing the ES9023P DAC for most inputs ensures high-resolution audio decoding and playback, delivering a high-fidelity listening experience.

2.1 Channel System Support: D4 seamlessly integrates with a subwoofer, creating a 2.1-channel system. This enhances the overall audio experience with powerful bass reproduction, ideal for movies, music with deep bass lines, and immersive gaming.

Enhanced Mid-Frequency Performance: In TONE mode, D4 offers precise control over BASS, MIDDLE, and TREBLE frequencies. Adjustment range: (-12db) ~ (+12db)Notably, it excels in reproducing mid-range frequencies, resulting in clear and natural vocal reproduction and a more engaging listening experience within the 2.1-channel system. This accurate mid-range reproduction significantly contributes to the overall audio quality and immersion.

HDMI ARC Integration: D4 supports HDMI ARC input, enabling seamless connection to modern TVs. This allows for convenient audio playback from the TV, including streaming services, gaming consoles, and cable/satellite boxes, directly through the amplifier for a more immersive and high-quality audio experience.

Op-Amp Customization: The D4 features an op-amp socket, allowing users to swap out the included OPA1642 with other op-amp chips. This customization enables users to tailor the amplifier's sound characteristics to their personal preferences, potentially achieving different sound textures, warmth, or detail.

Bluetooth Capabilities: supports Bluetooth 5.0 with AAC and SBC codecs. This allows for wireless audio streaming from compatible devices like smartphones, tablets, and computers.

Sampling Rate: The Bluetooth and USB inputs support sampling rates ranging from 44.1 kHz to 48 kHz, which are common audio sampling rates.

High-Resolution Support: The Optical, Coaxial, and HDMI ARC inputs support a maximum sampling rate of 192 kHz, enabling high-resolution audio playback for those sources.

This refined list highlights the key strengths of the D4 amplifier, emphasizing its versatility, audio quality, 2.1-channel capabilities, exceptional mid-frequency performance, and convenient HDMI ARC integration.

Specifications：
Model: D4
THD: ≤ 0.01%
SNR: ≥ 108dB
SINAD: 87dB
Input Mode: HDMI ARC / BLUETOOTH/ USB /Optical/ Coaxial /RCA
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 Amplifier*1
36V5A/48V5A/NO POWER(Optional)
USB LINE/ U DISK
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.

--Free customization of tone｜Interchangeable op amp+NJW1119A three-band ±12dB adjustment, precise adjustment of vocals/low frequency. HDMI ARC audio and video synchronization

--The volume can be adjusted in real time with TV remote control to create a home theater experience

Bluetooth 5.3 Support SBC AAC 

--It can easily connect to smartphones, tablets, computers, tablets, etc., allowing you to easily enjoy the convenience and speed of wireless. 

Customizable Sound

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

USB Audio Amplifier for PC

--Provide high-fidelity audio for PC and laptops, making up for the lack of power and audio quality of built-in sound cards.

--You can also experience playing music by connecting a USB flash drive via an extension cable.

Replaceable OP-AMP CHIP

--The OPA1642 op amp is standard

--it compatible with mainstream models and can be replacedfreely to meet personalized listening needs

High-Quality Components

--Nippon Chemi-Con capacitor .

--4 single inductors.

--Nikon coupling capacitor, WIMA capacitor

PFFB solves load dependency

--PFFB technology eliminates load dependency, enhancing performance and sound quality significantly

Excellent heat dissipation

--The radiator connects the entire shell to participate in heat dissipation.

Analog input

--practical for connecting CD, decoder, radio, and vinyl analog output. etc.

Optical, Coaxial, HDMI ARC Sampling rate 192KHz

--Suitable for scenes that require stable sound quality and avoid interference, such as TVs, game consoles, etc.

2.1 channel audio system creation

--SW OUT output connects to active subwoofer