How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a do-everything Bluetooth DAC/amp that turns any phone, laptop or tablet into a high-res rig, choose HiBy W4; if you need a self-contained music player that stores your library on a card and plays it without a phone, choose HIFI WALKER H2.
• HiBy W4 — biggest strength: a true dual-DAC, dual-amp Bluetooth/USB converter (dual CS43198 + dual SGM8262) with LDAC, aptX Lossless, NFC pairing, a touchscreen and both 3.5mm and 4.4mm balanced outputs — it upgrades the gear you already own.
• HiBy W4 — biggest trade-off: it has no internal music storage and no card slot. It's a converter, not a library. You still need a phone, computer or player as the source.
• HIFI WALKER H2 — biggest strength: it's a complete, offline-first player. An included 128GB microSD card, ESS ES9018K2M DAC, physical buttons and a 1500mAh battery mean you can listen with no phone and no streaming.
• HIFI WALKER H2 — biggest trade-off: its headphone output is modest (70mW + 70mW at 32 ohms, 16–150 ohm headphones), Bluetooth is 5.2, and there's no balanced output — so demanding, hard-to-drive headphones aren't its job.
• Who each pick is for: choose the W4 if your source is a phone or PC and you want better sound out of it. Choose the H2 if you want to leave the phone at home and carry your own files.
The HiBy W4 is a converter first and foremost, and it's built to sit between whatever you already own and your headphones. On the wireless side it runs Bluetooth 5.4 with LDAC, aptX Lossless, aptX HD and Snapdragon Sound, plus NFC one-touch pairing and cVc noise cancellation for calls through an external mic input. On the wired side it's a USB DAC supporting UAC 1.0 and UAC 2.0, so it works across phones, laptops, tablets and digital audio players, switching between Bluetooth and USB DAC modes without a fuss.
Buy the W4 if your music already lives on a phone, laptop or player and you want that source to sound dramatically better — wirelessly or over USB — with the flexibility to drive both easy and demanding headphones. Skip it if you want a device that holds your files and plays them with nothing else attached; the W4 has no storage and no card slot.
HIFI WALKER H2: Who It's For
The HIFI WALKER H2 takes the opposite approach: it's a dedicated local player, and it wants to replace your phone as the thing in your pocket. It ships with a 128GB microSD card and accepts cards up to 512GB, so your FLAC, WAV, DSD and MP3 collection lives on the device itself — no streaming, no tethering, no notifications. Format support is broad for local files: WAV up to 32-bit/384kHz, FLAC/APE/ALAC up to 24-bit/192kHz, DSF/DFF up to DSD128, SACD-ISO up to DSD64, and MP3.
The audio path is an ESS ES9018K2M DAC paired with a MAX97220A headphone amplifier, delivering up to 70mW + 70mW at 32 ohms into 16–150 ohm headphones. That's a solid match for typical in-ears and efficient over-ears, but it's not a powerhouse — plan on pairing it with easy-to-drive gear. Physically it's a focused, tactile device: a 2-inch LCD, physical playback controls you can use without looking, a zinc-alloy body in matte black, Bluetooth 5.2, a 3.5mm headphone and line out, and USB-C that doubles as an external USB DAC when you plug it into a computer. The 1500mAh battery is rated around 10 hours.
Buy the H2 if you want a distraction-free player with your own library on a card, physical buttons, and the option to use it as a USB DAC at a desk. Skip it if you need to drive power-hungry headphones, want a balanced output, or expect the latest Bluetooth codecs — the H2 is about local playback, not wireless maximums.
Side-by-Side: Which Should You Choose?
• Best for phone-free listening → HIFI WALKER H2. It has an included 128GB card (up to 512GB) and plays files with no phone or streaming involved.
• Best for wireless codec quality → HiBy W4. Bluetooth 5.4 with LDAC, aptX Lossless and aptX HD plus Snapdragon Sound beats the H2's Bluetooth 5.2.
• Best for the highest resolution ceiling → HiBy W4. DSD512 and PCM 768kHz/32-bit, versus the H2's DSD128 and 32-bit/384kHz WAV.
• Best for tactile, screen-off control → HIFI WALKER H2. Dedicated physical playback buttons are easier to use blind than a touchscreen.
• Best for tuning and tinkering → HiBy W4. 3 gain levels, channel balance, 4 digital filters, EQ presets, volume lock and a live sampling-rate indicator.
• Best as a desktop sidekick → either, differently. The W4 is a USB DAC for a computer; the H2 is also a USB DAC but doubles as a standalone player when unplugged.
• Best for calls and voice → HiBy W4. External mic input with cVc noise cancellation; the H2 is built for music playback.
For most people reading this, I'd buy the HiBy W4. In my opinion it's the more versatile device: it makes the phone or laptop you already carry sound far better, handles both wireless and wired sources, and has the power and balanced output to grow with better headphones. The HIFI WALKER H2 is the right pick only if your priority is a standalone, offline player with your own library on a card and physical buttons — and you're happy sticking to efficient headphones. Those are two different jobs, and I'd match the device to the job rather than to a spec sheet.
The HiBy W4 reaches higher on paper — DSD512 and PCM 768kHz/32-bit versus the H2's DSD128 and 32-bit/384kHz WAV. But the H2 covers the formats most people actually own, so "better" depends on whether you need that ceiling.
No. That's its main appeal. With the included 128GB card (expandable to 512GB) it plays your local files on its own, and it can also act as a USB DAC when connected to a computer.
In my opinion, yes. It offers up to 475mW and a 4.4mm balanced output, while the H2 is rated 70mW + 70mW at 32 ohms and designed for 16–150 ohm headphones.
I can't quote prices here, and both change over time — check the current price on Amazon before deciding. Weigh that against what you need: a source upgrade (W4) or a standalone player (H2).
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