{"product_id":"audirect-atom4-portable-usb-c-dac-headphone-amplifier-dongle","title":"Audirect Atom 4 USB-C DAC \u0026 Headphone Amplifier Dongle","description":"\n\u003ch2\u003eAudirect Atom 4 — Portable USB-C DAC \u0026amp; Headphone Amplifier Dongle\u003c\/h2\u003e\n\u003cp\u003eUnlock studio-grade audio from your smartphone, tablet, or laptop with the \u003cstrong\u003eAudirect Atom 4\u003c\/strong\u003e. Powered by the flagship \u003cstrong\u003eESS9281AC PRO DAC chip\u003c\/strong\u003e and a two-stage amplification circuit, the Atom 4 delivers audiophile-level clarity, dynamics, and power in a pocket-sized dongle weighing just 19 g. Whether you prefer single-ended or fully balanced listening, the Atom 4 has you covered with both a \u003cstrong\u003e3.5 mm SE output\u003c\/strong\u003e and a \u003cstrong\u003e4.4 mm balanced output\u003c\/strong\u003e — all driven by True Balanced architecture for ultra-low noise and distortion.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eESS9281AC PRO DAC Chip\u003c\/strong\u003e — High-resolution decoding up to \u003cstrong\u003e32-bit \/ 768 kHz PCM\u003c\/strong\u003e and \u003cstrong\u003eDSD512\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrue Balanced 4.4 mm Output\u003c\/strong\u003e — Dual RT6863C op-amps in the first stage; switching amplifier in the second stage for exceptional headroom\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Output Power\u003c\/strong\u003e — Up to 4.2 Vrms (balanced); ≥ 126 mW @ 32 Ω; ≥ 7 mW @ 600 Ω — drives everything from sensitive IEMs to demanding full-size headphones\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Distortion\u003c\/strong\u003e — THD+N: 0.0004%; SNR: −119 dB for pristine, artifact-free sound\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlat Frequency Response\u003c\/strong\u003e — \u0026lt; ±0.08 dB up to 40 kHz ensures true-to-recording accuracy\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility\u003c\/strong\u003e — USB Type-C input works with Android smartphones, Windows, macOS, and more (USB Type-A adapter-friendly)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Compact \u0026amp; Bus-Powered\u003c\/strong\u003e — 19 g, no built-in battery required; draws power directly from your host device\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlastic Housing\u003c\/strong\u003e — Lightweight and durable for everyday on-the-go use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAtom 4\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDAC Chip\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eESS9281AC PRO × 1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOp-Amp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRT6863C × 2\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAudio Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB Type-C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAudio Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.5 mm Single-Ended \/ 4.4 mm Balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; ±0.08 dB up to 40 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Output Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 4.2 Vrms (Balanced)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Power (32 Ω)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥ 126 mW (Current Drive) \/ ≥ 137 mW (Current Drive)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Power (600 Ω)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥ 7 mW (Voltage Drive) \/ ≥ 29 mW (Voltage Drive)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSNR\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e−119 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTHD+N\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.0004%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePCM Sampling Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 32-bit \/ 768 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDSD Support\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to DSD512 (2.8224 MHz DSD64 base)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e19 g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBuilt-in Battery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo (bus-powered)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHousing Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWho Is the Atom 4 For?\u003c\/h3\u003e\n\u003cp\u003eThe Audirect Atom 4 is ideal for audiophiles, musicians, and everyday music lovers who want a significant upgrade over their device's built-in audio output without carrying bulky equipment. Its True Balanced 4.4 mm output pairs beautifully with high-end IEMs and full-size headphones alike, making it a versatile companion for commuting, travel, home listening, and studio monitoring on the go.\u003c\/p\u003e\n\n\u003cp\u003eFor more information on high-resolution audio standards and formats, visit the National Institute of Standards and Technology (NIST) for technical audio measurement references.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What devices are compatible with the Audirect Atom 4 USB-C DAC dongle?\u003c\/h4\u003e\n\u003cp\u003eA: The Atom 4 is compatible with any device featuring a USB Type-C port that supports USB audio output, including Android smartphones, Windows PCs, macOS laptops, and iPads with USB-C. For USB Type-A computers, a standard USB-C to USB-A adapter (not included) can be used.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the difference between the 3.5 mm and 4.4 mm outputs on the Atom 4?\u003c\/h4\u003e\n\u003cp\u003eA: The 3.5 mm output is a standard single-ended connection suited for most consumer headphones and IEMs. The 4.4 mm output is a True Balanced connection that provides higher output voltage (up to 4.2 Vrms), lower crosstalk, and greater dynamic range — ideal for balanced-terminated audiophile headphones and in-ear monitors.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the Audirect Atom 4 support hi-res audio formats like DSD and MQA?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the Atom 4 supports PCM up to 32-bit \/ 768 kHz and DSD up to DSD512 via its ESS9281AC PRO chip. MQA support depends on your playback software's unfolding capability — the Atom 4 will pass through the decoded stream at full resolution.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the Atom 4 require a battery or external power source?\u003c\/h4\u003e\n\u003cp\u003eA: No. The Atom 4 is entirely bus-powered, drawing its operating power directly from the connected host device's USB port. There is no built-in battery, keeping the dongle lightweight at just 19 g.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What devices are compatible with the Audirect Atom 4 USB-C DAC dongle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Atom 4 is compatible with any device featuring a USB Type-C port that supports USB audio output, including Android smartphones, Windows PCs, macOS laptops, and iPads with USB-C. 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