Amazon Sony  
Sony WH-1000XM4 Wireless Premium Noise Canceling Overhead Headphones - 30hr Battery Life, Over Ear Style with Mic for Phone-Call and Alexa Voice Control - Black International Version
Noise cancellation, powered by HD Noise Cancelling Processor QN1. Industry-leading noise canceling with Dual Noise Sensor technology,Specific uses for product Audio Frequency Response 4Hz-40,000Hz. Headphone Type Closed, dynamic. Frequency Response: 4 Hz-40,000 Hz
Sound quality - these Bluetooth headphones support ideal Resolution Audio, and even compressed music files are upscaled using evolved DSEE Extreme technology. Up to 30-hour battery life with quick charging (10 min charge for 5 hours of playback)
Speak-to-Chat automatically pauses playback when one start a conversation, Wearing Detection powers off headphones when not wearing them, plus more smart features for a seamless, hands-free listening experience. The WH1000XM4 Touch Sensor controls to pause play skip tracks, control volume, activate your voice assistant, and answer phone calls.
With multipoint connection, Sony headphones can be paired with two Bluetooth devices at the same time, Bluetooth version: 5.0 and frequency range: 2.4GHz band (2.4000GHz-2.4835GHz), Effective Range : Line of sight approx. 30ft (10m)
Driver Unit : 40mm dome type (CCAW Voice coil), Plug : Gold-plated L-shaped stereo mini plug, Cord Length : Headphone cable (approx. 1.2m, OFC strands, gold-plated stereo mini plug)
Sony WH-1000XM4 Wireless Premium Noise Canceling Overhead Headphones - 30hr Batt
Amazon S.M.S.L  
S.M.S.L D-6s MQA MQA-CD ES9039Q2M Bluetooth Decoder XU316 D6s DAC with Remote Control
Clean up the recording. When the analog sound is converted to a digital signal, time blurring will occur, blurring transient signals over time. As a result, our ears cannot tell where asingle sound comes from, the comparison between recorded music and “live performances” is unremarkable! MQA can eliminate this distortion and createa true 3D sound field, which is different from any sound you have ever heard.
Encapsulate the sound. Once the blur in the recording is removed, MQA will use what we call a "musical origamiMprocess, cleverly makes this large resolution file easy to manage andcan compatible with any service or playback device.
CD Player + MQA-Enabled DAC Your CD player's digital output (optical or coaxial) can be fed to an MQA decoder. The MQA decoder can restore the original high-resolution signal heard in the studio and confirm it, using the authentication signature.S.M.S.L D-6s support MQA CD.
The brand-new third-generation XMOS XU-316, supports PCM 32bit/768kHz and DSD512. The audio clock processing circuit helps reduce clock jitter greatly. Input ports (except Bluetooth) support MQA and DSD, coaxial and optical support DoP64.
Built-in self-developed low-noise switching power supply and multiple analog circuitslow-noise power supply. Built-in specially designed low noise switching power supply. High-quality gold-plated input and output connectors.
S.M.S.L D-6s MQA MQA-CD ES9039Q2M Bluetooth Decoder XU316 D6s DAC with Remote Co
Amazon BluDento  
BluDento B2 aptX HD LDAC True Hi-Fi Bluetooth v5.1 Audio Receiver, Built-in ESS DAC for Analog Stereo RCA Output, Enhanced Working Range, Digital Coaxial & Optical Outputs
Why BluDento B2 Lossless Bluetooth Receiver ? We have an on-board ESS DAC for analog output, others do not. It automatically enters pairing mode when it is powered on and does not require manual operation. BluDento B2 does not require a driver and does not require an APP, while WiFi audio receivers require a driver and require an APP. Auto Reconnect: Turn on your phone's Bluetooth first, then launch BluDento.
Bluetooth Version 5.1: BluDento Bluetooth DAC is featuring Bluetooth v5.1 chipset which is a premium solution delivering high quality wireless audio performance and supporting for LDAC, aptX HD, aptX Low Latency, aptX, AAC and SBC decoding.
Audiophile Grade DAC: Features ESS ES9018K2M DAC which is a high performance 32bit / 384kHz PCM data, 2CH audio D/A converter targeted for audiophile grade portable applications, a high level that will satisfy the most demanding audio enthusiasts. 2.1VRMS MAX RCA output level.
Flexible Output Connectivity: Supports both analog ( L/R RCA / 3.5MM AUX ) and digital ( Optical TOSLINK + SPDIF Coaxial ) outputs, provides wide compatibility with your existing stereo equipment.
Enhanced Long Range: Utilizing CLASS 1 Bluetooth technology and designed with external gain antenna. Kindly be noted that Operation Range can be affected by many factors such as physical obstructions like walls, metal obstacles. And also depended on Bluetooth source devices.
Bring Your Old Speakers Back To Life: BluDento B2 is HiFi Bluetooth DAC Receiver supports aptX HD which can stream high quality music from Bluetooth enabled cellphone, pc or tablet to any of your home stereo systems. Plug and Play, super easy to use.
BluDento B2 aptX HD LDAC True Hi-Fi Bluetooth v5.1 Audio Receiver, Built-in ESS
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