We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-04 · 7 min read · Independent comparison
If you want a desktop hi-res DAC and headphone amp that decodes PCM up to 32bit/768kHz and DSD512 and can also drive a pair of active speakers, choose LOXJIE D30; if you need a palm-sized phono stage for a turntable with a built-in headphone amp, choose S.M.S.L PH-1. That's the whole decision in one line, and it matters most when you're chasing hi-res headphones for jogging or any other listening session where clean decoding and a quiet output stage are the point.
• LOXJIE D30 — biggest strength: a genuine hi-res decoding engine (ES9039 Q2M, MQA full decoding, PCM 32bit/768kHz, DSD512, THD+N down to 0.0001%) plus a 6.35mm headphone out and RCA out with independent volume memory.
• LOXJIE D30 — biggest trade-off: it's a full-size desktop box (6.69 x 5.91 x 1.5 inches, 2.2 pounds) that needs a wall outlet and a bit of shelf space, and it brings no wireless headphone support of its own — Bluetooth 5.1 here is an input, not a headphone link.
• S.M.S.L PH-1 — biggest strength: a compact MM phono amplifier (46dB gain, SNR 84dB, THD+N 0.008%) with a front 6.35mm headphone jack and an isolated dual power supply that keeps hum out of the chain.
• S.M.S.L PH-1 — biggest trade-off: it's MM-only by design, so moving-coil cartridges are off the table, and it's a phono stage first — not a general-purpose USB DAC for a computer.
• Pick LOXJIE D30 if: you listen from a PC, streamer or Bluetooth source and want one box to decode and amplify wired headphones and powered speakers.
• Pick S.M.S.L PH-1 if: vinyl is your main source and you want a small, quiet phono stage that can also drive wired headphones when speakers aren't practical.
The D30 is a desktop DAC and headphone amplifier built around ESS's ES9039 Q2M chip, and the spec sheet reads like a machine aimed at people who care about numbers without wanting to think about them. PCM support runs to 32bit/768kHz. DSD goes to DSD512 with hard decoding. MQA full decoding and MQA-CD are handled over optical and coaxial, and THD+N is quoted as low as 0.0001% (-120dB), with dynamic range and SNR both reaching 123dB. Whether or not you can hear every one of those figures, the point is that the decoding stage is not the weak link in your chain.
Where it earns its keep is flexibility. There's a 6.35mm headphone jack and an RCA output, and the two have independently memorized volumes — switch output mode and the level follows you instead of blasting your ears or your speakers. Front-end mode gives you fixed or variable output up to 2.0Vrms for active speakers, which is a genuinely useful thing to have if your desk setup doubles as a speaker setup. Inputs cover optical, coaxial, USB and Bluetooth 5.1 with apt-X HD, the last of which is handy for casual streaming from a phone. A remote handles output switching, and power draw is modest: under 5W working, under 0.5W on standby.
Who should buy it: someone building a wired desktop system — computer, streamer or disc transport in, headphones and powered monitors out — who wants high-resolution decoding, MQA support and a real headphone amp in one aluminum chassis. Who should skip it: anyone who wants to walk around, because there's no battery and no wireless headphone output here. If your idea of listening is a headphone for jogging with nothing tethered, this is the wrong shape of product entirely.
The PH-1 is a different animal. It's a high-fidelity MM phono amplifier with a gold gain figure of 46dB, delivering an output signal around 1000mV. Key numbers: THD+N 0.008% (-81dB), channel separation -77dB, signal-to-noise ratio 84dB, dynamic range 85dB. S.M.S.L's design choice here is deliberate — by supporting only MM cartridges instead of both MM and MC, the circuit performance improves by 50% and the unit stays simple for the large majority of turntable owners who run MM. If you've ever fought hum in a vinyl chain, that focus is a feature, not a limitation.
The physical design backs it up. It's palm-sized at 96 x 94 x 30mm, freestanding, with six connections fitted onto a chassis that won't clutter a shelf. High-precision CNC machining gives it mechanical rigidity and EMI resistance, the signal path is kept short, and the connectors are treated for oxidation and corrosion resistance so signal transfer stays clean over time. Power comes from an isolated dual supply design, which is the part that matters most for a phono stage: it minimizes hum and grounding problems, and you can step up to a higher-grade DC supply later if you want to push it further.
Then there's the headphone amp with its front-panel 6.35mm jack. That's the sleeper feature. It means you can run your turntable through the PH-1 and listen on wired headphones when loudspeakers aren't an option — late at night, in a shared apartment, or in a room where speaker placement is hopeless. Who should buy it: vinyl-first listeners with an MM cartridge who want a quiet, compact phono stage and occasional headphone listening from the same box. Who should skip it: anyone who needs MC support, or anyone whose main source is a computer rather than a turntable.
• Best for computer and streamer audio → LOXJIE D30. USB, optical, coaxial and Bluetooth 5.1 inputs with apt-X HD make it a hub, not just a phono accessory.
• Best for vinyl playback → S.M.S.L PH-1. 46dB of MM gain and an isolated dual power supply are exactly what a turntable chain wants.
• Best for high-resolution headphone listening → LOXJIE D30. PCM 32bit/768kHz, DSD512 hard decoding and MQA full decoding put the D30 clearly ahead for hi-res source material.
• Best for small spaces → S.M.S.L PH-1. At 96 x 94 x 30mm it fits where a full-size DAC simply can't go.
• Best for driving powered speakers → LOXJIE D30. RCA out with fixed or variable front-end mode up to 2.0Vrms is built for active monitors.
• Best for hum-free phono signal → S.M.S.L PH-1. The isolated dual supply design and short signal path exist specifically to keep the noise floor down.
• Best for remote control convenience → LOXJIE D30. Output mode and volume switching from the included infrared remote.
• Best if you're torn between formats → buy the one that matches your main source. Turntable first, PH-1. Digital first, D30.
In my opinion, the LOXJIE D30 is the better buy for most people reading a hi-res headphones comparison, because it handles the widest range of sources and resolutions in one box. PCM 32bit/768kHz, DSD512 and MQA full decoding cover essentially any digital file you'll throw at it, and the 6.35mm headphone output with its own memorized volume makes wired listening painless. If your world is vinyl, the S.M.S.L PH-1 is the smarter, quieter, smaller choice. And if your actual goal is a headphone for jogging with no cables at all, neither of these is your product — both are wired, stationary audio gear. Check the current price on Amazon for whichever one matches your source.
what is hi res headphones
The term describes headphones used with high-resolution audio sources — files or streams that carry more information than a standard CD. In this comparison, the LOXJIE D30 is the component that actually handles those high-resolution formats, decoding PCM up to 32bit/768kHz, DSD512 and MQA.
what is hi res audio headphones
Hi-res audio headphones are simply headphones paired with a high-resolution signal chain. The headphones themselves don't decode anything — the DAC does. That's why the D30's ES9039 Q2M chip, its 123dB dynamic range and SNR, and its low 0.0001% THD+N matter more than the headphone label on the box.
what are hi res headphones
They're headphones intended for listening to high-resolution material, usually wired, usually driven by a dedicated DAC and amplifier rather than a phone's headphone jack. A 6.35mm output like the one on the LOXJIE D30 or the S.M.S.L PH-1 is the typical connection for that kind of setup.
which headphones support hi res lossless
Support depends on the whole chain, not the headphone alone. You need a source and a DAC that pass the format through — the LOXJIE D30 does this with MQA full decoding, PCM 32bit/768kHz and DSD512 — plus wired headphones connected to a proper amplifier output such as the 6.35mm jack on either unit here.
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