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Small black anodised aluminium mixer, 33 by 28 by 13 mm, two 3.5 mm inputs, USB power, one output

Alesis A04 2-Channel Stereo Audio Mixer 3.5mm USB 48 kHz

SKU CH-9WV8-M3B98

A pocket-sized 2-channel stereo mixer combines two 3.5 mm sources into one output with 48 kHz sampling and 125 mW headphone drive

  • Spec summaryA04, cooidea, 2, 48 kHz, USB, 3.5 mm, Any DAW software
  • Audio inputsUSB, 3.5 mm
  • Audio channels2
  • Driver sizeAny DAW software
  • Sampling rate48 kHz
  • Power supplyUSB, false
  • Combines two stereo sources into one headphone output
  • 97220 chip with capacitor-free design delivers 125 mW at 32 ohms
  • THD as low as .001 % for clean sound
  • Aluminium alloy shell measures 33 x 28 x 13 mm and weighs .05 kg
  • USB power plus 3.5 mm jacks work with PC, phone and laptop

What this mixer is and who it serves

The Alesis A04 is a two-channel stereo audio mixer with 3.5 mm inputs and USB power. It combines two source signals into a single headphone or speaker output and runs at 48 kHz sampling. The aluminium-alloy shell measures 33 mm by 28 mm by 13 mm and weighs 0.05 kilograms, so it fits in a pocket or on a crowded desk.

What it replaces and when the step up matters

It replaces the need for a software mixer or a bulky desktop unit when you only need to blend two analogue sources such as a phone and a laptop. The jump is worth it when you want hardware summing with 0.001 % THD and a 97220 chip instead of relying on operating-system routing. It does not serve buyers who need microphone preamps or more than two input channels.

Behaviour under sustained load

The headphone amplifier delivers 125 mW into 32 ohms continuously without audible distortion. Ground-loop suppression keeps the noise floor low during long sessions, and the USB power draw stays steady at 5 V. The capacitor-free output stage maintains consistent bass response over extended use.

How it compares

Measured against everything we stock in Sound Mixers & Mixing Consoles, at today’s prices. Recalculated every night.

Price $27.99
Cheaper than about 93% of the 270 comparable items (median $114.99).

Specifications

Product
Brand nameAlesis
Product lineA04-NEW
Model nameA04
Part numberA04-NEW
Product typeMicrophone
Audio & video
Audio inputsUSB, 3.5 mm
Audio channels2
Driver sizeAny DAW software
Power
Power supplyUSB, false
Battery timeNo
Size & build
Measurements14.33 in W × 12.83 in H × 9.06 in D
Product weight0.05 kg
More details
Sampling rate48 kHz

Questions about this item

What size opening or surface area does the 33 mm × 28 mm × 13 mm metal case need?

The aluminium-alloy housing measures 33 mm wide, 28 mm deep and 13 mm high, so it fits on any flat surface or shelf that can accommodate those dimensions and weighs only 14 g.

How do I connect the two 3.5 mm sources and the USB power, and what step is often missed?

Plug each source into the two 3.5 mm input jacks, connect the headphones or speaker to the single 3.5 mm output, then insert the supplied USB cable for 5 V power — the mixer stays mute until the USB cable is actually plugged in.

When should I replace the included 1‑metre 3.5 mm cable or the USB power lead?

Swap either cable if the connectors become loose, the sheathing frays, or you hear intermittent crackling — both cables are standard 3.5 mm stereo and USB‑A types, so any equivalent replacement works.

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