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Our take

 

Your phone probably has no headphone jack and not much power behind the one it fakes with a dongle. The W4 fixes both, wirelessly. It receives your music over Bluetooth and drives your earphones from a proper balanced output — while your phone stays in your pocket or bag. It has a small colour touchscreen, so you can actually see your codec, volume, and track instead of guessing.

The sound is clean and even, not coloured. The honest tradeoff: Bluetooth is never quite as pristine as a wired connection, and the battery is modest — but for the freedom of going wireless, most people won't look back. And when you do want the best quality, you can plug it in over USB and it becomes a wired DAC.

 

What it'll drive :

Every earphone VividSound sells runs easily from the W4 — IEMs don't need much power, and the balanced output has plenty in reserve. It stays quiet enough for sensitive sets like the Mystic 8, and has enough headroom that even full-size headphones are on the table. In short: nothing in the lineup will out-muscle it.
What Bluetooth costs you here is a little ultimate resolution, not volume.

Streaming & compatibility

 

Your phone does the streaming, so every app works — Apple Music, Tidal, Spotify, Qobuz, whatever you already use. What decides sound quality over Bluetooth is the codec, and the W4 supports the good ones: LDAC, aptX Adaptive, aptX Lossless, aptX HD, aptX, AAC and SBC. On an Android phone, LDAC or aptX pulls the most detail.
On an iPhone you're limited to AAC over Bluetooth — that's an Apple limitation, not the W4's, and it still sounds good. Want the best possible quality? Plug into your phone or laptop over USB-C and it runs as a straight wired DAC, skipping Bluetooth entirely. It clips on, or sticks to a MagSafe-compatible phone with the magnetic backplate.

Power & Battery

 

Two outputs, two gain levels: 125 mW from the 3.5 mm, 475 mW from the balanced 4.4 mm — comfortably more than any earphone here needs. Battery is the thing to know: the built-in 1500 mAh cell gives roughly 6 hours over Bluetooth on the 3.5 mm, and a little less on balanced or on the higher-quality codecs like LDAC.

Expect to charge it most days. Handy touch — an "Uncharge" mode lets it run off its own battery when plugged into your phone, so it powers your earphones without draining your phone.

Specs

  • DAC: dual Cirrus Logic CS43198
  • Amp: dual SGM8262
  • Bluetooth: Qualcomm QCC5181, Bluetooth 5.4
  • Bluetooth codecs: LDAC, aptX Adaptive, aptX Lossless, aptX HD, aptX, AAC, SBC (Snapdragon Sound)
  • Wired (USB DAC) support: PCM up to 32-bit/768kHz, native DSD512
  • Outputs: 3.5 mm single-ended + 4.4 mm balanced
  • Output power: 125 mW (3.5 mm) / 475 mW (4.4 mm balanced)
  • Display: 2" colour touchscreen
  • Battery: 1500 mAh — approx. 6.3 h (3.5 mm) / 5 h (4.4 mm), continuous AAC; less on hi-res codecs
  • Extras: NFC pairing, USB-C (charge + data + digital input), mic for calls, "Uncharge" mode, clip + magnetic backplate
  • Dimensions: ~65 x 65 x 22mm
  • Weight: 93.3 g
Hiby W4 - Portable Audio DAC and Amplifier - vividsound
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v
victor

Never owned a DAP. Super happy with how this one works!