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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-24 · 7 min read · Independent comparison
• Douk Audio Mini — biggest strength: four separate 3.5 mm stereo inputs with independent volume knobs, a main volume knob, and a headphone out that works directly when USB-powered. It weighs only 120 g.
• Douk Audio Mini — biggest trade-off: everything runs on 3.5 mm plugs, and in passive mode the headphone jack can't drive headphones on its own — you need a separate headphone amp.
• Zenolix RM04 — biggest strength: a proper mixing console layout — 2 XLR/6.35 mm combo inputs with 48 V phantom, a stereo line in, per-channel high/mid/low EQ, PAN, FX send, 99 reverb effects, and a 24-bit/192 kHz USB-C audio interface with loopback.
• Zenolix RM04 — biggest trade-off: it's a 3.08 kg corded unit built to sit on a desk or table, so it's a stay-put piece of gear, not a pocket accessory.
• Pick the Douk Audio Mini for quick headphone monitoring of several small sources, and pick the Zenolix RM04 when microphones, instruments and recording are part of the job.
The Douk Audio Mini (MC5 PRO, 4-channel version) is best understood as a problem-solver for people who have too many small sources and only one pair of ears. It gives you four groups of 3.5 mm inputs, one 3.5 mm AUX output and a 3.5 mm headphone jack. That's it — no XLR, no phantom power, no EQ. What it does instead is let you blend a CD player, a portable recorder, a video playback device or a small instrument feed, then ride each one with its own volume knob while a fifth knob sets the main output. The channels don't interfere with each other, which matters when you're balancing sources that live at very different levels.
The feature I like most is the two-mode design. Plug in USB power and the built-in amp chip goes active: the mixed signal gets amplified and you can monitor straight from the 3.5 mm headphone jack. Leave the USB cable off and it drops into passive mode, working as pure resistance attenuation with a slightly weaker output — and in that state the headphone jack won't drive headphones by itself, so you'd need to add a headphone amp downstream. For a field recorder, a camera rig or a tabletop setup where power outlets are scarce, that fallback is genuinely useful.
Who should buy it: someone who wants a compact, corded 5 V mixer with headphone monitoring for small line-level gear, and who values the 2.56" × 4.29" × 1.1" footprint and 120 g weight. Who should skip it: anyone who needs to plug in microphones, anyone who wants tone shaping on each channel, and anyone who expects to record a multitrack session to a computer. If your sources aren't 3.5 mm, this isn't the box for you.
The Zenolix RM04 is a different category of device. It's a 4-channel sound board built around 2 XLR/6.35 mm mono combo inputs and 1 stereo 6.35 mm line in, with mute and 48 V phantom power on each input, plus both 6.35 mm and 3.5 mm headphone outs. That phantom power detail alone changes who this is for: condenser microphones become usable, which is the line between a toy and a working console for podcasts, worship services, open mics and small gigs.
On top of the inputs, every channel gets high/mid/low EQ, PAN and an FX send, with HI-Z on channel 1 and LOW-CUT on channel 2, plus 99 reverb effects on board. HI-Z on channel 1 is the tell that Zenolix expects a guitar or bass to be plugged straight in. The reverb bank is aimed at singers and karaoke hosts who want ambience without hauling extra outboard gear. It also handles Bluetooth playback from a phone and USB U-disk playback with on-board recording, so background tracks and quick captures don't require a laptop at all.
The part that matters most for headphone users is the USB side: connect over USB Type-C and the RM04 acts as a 24-bit/192 kHz audio interface with loopback. That means your computer sees it as an input and output device, so you can monitor through the headphone jacks while recording or streaming. Main outputs are balanced XLR and 6.35 mm TRS, which suits powered speakers and desktop monitors. At 3.08 kg and corded-only, it lives on a desk or a table — that's the trade-off for all that I/O.
Who should buy it: podcasters, streamers, singer-songwriters, church volunteers and small-band engineers who need mic inputs, per-channel EQ and a computer interface in one box. Who should skip it: someone who only needs to blend a few 3.5 mm gadgets and wants something pocket-sized.
Side-by-Side: Which Should You Choose?
• Best for microphone work → Zenolix RM04. 2 XLR/6.35 mm combo inputs with 48 V phantom and per-channel mute.
• Best for a tiny, portable rig → Douk Audio Mini. 120 g, roughly 4.3" wide, and it can run with no power at all in passive mode.
• Best for headphone monitoring of line-level sources → Douk Audio Mini. Active mode drives the 3.5 mm headphone jack directly.
• Best for recording to a computer → Zenolix RM04. 24-bit/192 kHz USB-C interface with loopback.
• Best for tone shaping → Zenolix RM04. High/mid/low EQ, PAN and FX send on every channel, plus 99 reverb presets.
• Best for keeping four small sources separate → Douk Audio Mini. Four independent input knobs that don't interfere with each other.
• Best for balanced outputs to powered speakers → Zenolix RM04. XLR and 6.35 mm TRS main outs versus the Douk's single 3.5 mm AUX out.
If mixing headphones are the center of your workflow, I'd buy the Zenolix RM04. In my opinion it's the only one of the two that covers the whole chain: mics in with phantom power, EQ and reverb to shape them, a 24-bit/192 kHz USB interface to record, and both 6.35 mm and 3.5 mm headphone outs for monitoring. The Douk Audio Mini is a clever, genuinely portable little line mixer with a nice passive-mode trick, and I'd recommend it without hesitation for blending 3.5 mm sources on the move. But for a home studio, a podcast or a live setup where headphones do the monitoring, the RM04 does far more of the actual work.
Before you commit, check the current price on Amazon — the button on this page will show it, since prices move and I don't quote them here.
can you mix with just headphones
Yes, and both of these units are built with that in mind. The Douk Audio Mini has a 3.5 mm headphone jack that works directly in active (USB-powered) mode, while the Zenolix RM04 gives you 6.35 mm and 3.5 mm headphone outs. Just remember that headphone-only mixing hides room and speaker problems, so check your mix on a second system when you can.
how to connect studio headphones
Match the plug to the jack. The Zenolix RM04 covers both common sizes with a 6.35 mm and a 3.5 mm headphone out, so most studio headphones connect without an adapter. The Douk Audio Mini uses a single 3.5 mm headphone jack, so headphones with a 6.35 mm plug need a 3.5 mm adapter, and in passive mode you'd need a separate headphone amp.
how to test studio headphones
Run a few known tracks you trust — one bass-heavy, one vocal-heavy — and listen for channel balance, buzz and whether the left/right image holds. Both mixers can feed that test: the Douk Audio Mini from any of its four 3.5 mm inputs, the Zenolix RM04 from Bluetooth, a USB U-disk or a line input. Also sweep the volume knobs to check for noise or crackle at different levels.
how to bluetooth studio headphones
You don't connect headphones to either of these over Bluetooth — that's not what the Bluetooth on the Zenolix RM04 is for. Its built-in Bluetooth mixer receives audio from your phone so you can play backing tracks, then you monitor through the wired 6.35 mm or 3.5 mm headphone jacks. The Douk Audio Mini has no Bluetooth at all; everything is wired.
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