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Douk Audio D5 4-Way Audio Switcher/Splitter with 5-Band EQ Preamp Review

A 4-in-1-out switcher and 1-in-4-out splitter with a 5-band equalizer from 80Hz to 10kHz, EQ bypass, a built-in headphone amp and a large analog VU meter with 6-level backlight.

3.73.7 out of 5 starsUpdated October 14, 2026
$109.99Price checked October 14, 2026
Check price at Douk Audio
Douk Audio D5 4-Way Audio Switcher/Splitter with 5-Band EQ Preamp

Our verdict

The Douk Audio D5 solves two everyday hi-fi problems in one metal box for $109.99: choosing between four sources, or feeding one source to up to four amps and speakers at once. Add a 5-band equalizer with bypass, a built-in headphone amp and a backlit analog VU meter, and it earns its place on a busy desk. It is a switcher rather than a mixer, and the 3.5mm Priority jack overrides RCA — worth knowing before you wire it up.

Best for
Busy desktops that need to switch between several sources, split one source to multiple amps, and shape tone with a real 5-band EQ
Skip if
You need to blend or mix sources with per-channel levels, or you must keep a 3.5mm Priority connection and RCA in use at the same time
Check price at Douk AudioHow we research

The Douk Audio D5 is a 4-way audio switcher and splitter with a 5-band EQ preamp, priced at $109.99. It handles two opposite jobs: as a 4-in-1-out switcher it lets you move between four different sources — phones, tablets, players — without constant plugging and unplugging, and as a 1-in-4-out splitter it feeds up to four amplifiers or active speakers, with any combination of outputs working simultaneously for comparisons or multi-device listening.

The built-in equalizer offers precise adjustment at 80Hz, 330Hz, 1kHz, 3.3kHz and 10kHz, or an EQ bypass mode for a direct, unaltered signal. Volume control remains available in bypass mode. The D5 also doubles as a headphone amplifier for personal listening, and a large analog VU meter with 6-level backlight and gain adjustment provides real-time feedback on the music's dynamics — all in a compact metal enclosure.

Wiring notes from the maker: the 3.5mm Priority jack takes precedence over the RCA I/O ports, so if there is no sound from RCA, ensure the Priority jack is not connected. If noticeable noise appears, toggle the GND switch on the rear panel to resolve most ground-loop issues. And while the D5 switches between four inputs, it does not support individual volume control per channel, so it is not recommended as a mixer — it works effectively as a switcher instead.

In 1-IN-4-OUT mode all four channels can output simultaneously, with the D5 acting as a true audio splitter. The unit ships with a DC 5V/2A power adapter, and the maker advises using it or another supply delivering at least 2A, since insufficient current may cause the D5 to not function properly.

Shipping is worldwide with free and expedited options, and cost varies by country. Under 2kg ships airmail in an estimated 10-25 days; heavier orders move to DHL, UPS or FedEx in 5-8 days. Import duties and customs fees are the customer's responsibility. Free 30-day returns with a full refund and a 1-year warranty apply to all items, excluding orders placed by mistake, man-made damage or misuse, subjective change of mind, and anything else outside the warranty terms.

What we liked

  • Two devices in one: switch between four sources, or split one source to as many as four amplifiers or active speakers
  • 5-band EQ at 80Hz, 330Hz, 1kHz, 3.3kHz and 10kHz gives real tone shaping, with a bypass mode for an unaltered signal
  • Volume control remains available even in EQ bypass mode
  • A built-in headphone amplifier makes personal listening easy without a separate box
  • Thoughtful touches: a 3.5mm Priority jack, a rear GND switch for ground-loop noise, and a retro VU meter with 6-level backlight

Worth noting

  • It cannot be used as a mixer — there is no individual volume control per channel, so D5 works as a switcher rather than blending sources
  • The 3.5mm Priority jack takes priority over the RCA I/O: no sound comes from the RCA ports while it is connected
  • The rear GND switch resolves most ground-loop noise according to the maker, but 100% elimination is not guaranteed

Questions before you buy

Does the D5 come with a power supply?

Yes, it ships with a DC 5V/2A power adapter. If you use another supply, ensure it provides at least 2A of current, otherwise the D5 may not function properly.

Can all four outputs work at once?

Yes. In 1-IN-4-OUT mode all four channels can output simultaneously, with the D5 acting as an audio splitter.

Why is there no sound from the RCA ports?

The 3.5mm Priority jack takes priority over the RCA I/O port. To use the RCA I/O port, make sure the Priority jack is not connected.

What are the shipping and warranty terms?

Worldwide shipping with free and expedited options; under 2kg ships airmail (10-25 days), over 2kg by DHL/UPS/FedEx (5-8 days), with import duties paid by the customer. Free 30-day returns for a full refund and a 1-year warranty apply, excluding orders by mistake, misuse, change of mind and anything outside the warranty terms.

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