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Compact black box with three 3.5 mm inputs two outputs and volume knobs

cooidea 3-Channel 3.5 mm Audio Mixer USB-Powered 2 Output

SKU CH-E21D-KDKPA

A compact 3-channel 3.5 mm line-level mixer with stereo/mono switching, smart panning, dual outputs and USB power

  • Specification, cooidea, , , , Count, 1, TRS, , , , 52161500, cooidea, A09
  • Power SupplyUSB-POWERED
  • Dimension1.8 L x 3.3 W x 0.6 H inches
  • 3 independent line-level channels with Stereo/Mono toggle
  • Dual 97220 chips drive two separate outputs for monitoring and recording
  • Direct-coupled analog output removes capacitors to prevent low-frequency loss
  • Pure analog signal path delivers 20 Hz–40 kHz response with zero latency
  • Ground-loop isolation circuitry reduces background noise for clean transmission

Three-Channel Line Mixer for Desktop Creators

This cooidea mini mixer handles three independent line-level inputs with individual stereo or mono switching. A long press on a channel button activates smart panning that places mono sources at left, centre and right positions automatically. USB power keeps the unit running without an external adapter. It does not supply phantom power and cannot drive microphones directly.

Compact Build with Dual Independent Outputs

The chassis measures 1.8 by 3.3 by 0.6 inches and weighs 0.1 kilograms, so it sits unobtrusively on a crowded desk. Two 97220 driver chips feed separate headphone and recording outputs, each with its own volume dial. Capacitor-free direct-coupled circuitry removes low-frequency roll-off and phase shift, while built-in ground-loop isolation lowers the noise floor for cleaner signal transfer.

Adds Analogue Sub-Mixing to an Existing Interface

The pure analogue path delivers 20 Hz to 40 kHz response within 0.5 dB and true zero latency, letting you blend multiple sources before they reach your main audio interface. The jump is worthwhile when you need hands-on level control and spatial placement for several line-level devices without converting to digital and back. It will not replace a mic preamp or a multi-channel digital recorder.

Highlights

  • 3 independent line-level channels with Stereo/Mono toggle
  • Dual 97220 chips drive two separate outputs for monitoring and recording
  • Direct-coupled analog output removes capacitors to prevent low-frequency loss
  • Pure analog signal path delivers 20 Hz–40 kHz response with zero latency
  • Ground-loop isolation circuitry reduces background noise for clean transmission

Specifications

Brandcooidea
Specification, cooidea, , , , Count, 1, TRS, , , , 52161500, cooidea, A09, unit, 1.8 L x 3.3 W x 0.6 H inches, 1, USB-POWERED, false, false, 3, 0.1 kilograms, 1 year manufacturer., 1, , Auxiliary, , 1.8 inches, 3.3 inches, 0.6 inches, 2.9 L x 9.1 W x 9.5 H centimeters, 2026-04-23T06:20:55.304Z, ,
Power SupplyUSB-POWERED
Dimension1.8 L x 3.3 W x 0.6 H inches

Questions about this item

What does the 3.5 mm interface cap in practice?

The 3.5 mm jacks handle three independent line-level channels with a linear frequency response of 20Hz-40kHz (±0.5dB) and zero latency, but they do not supply phantom power and cannot support microphones.

What space does the 1.8 L x 3.3 W x 0.6 H inch chassis need to fit?

It occupies a desktop footprint of roughly 1.8 by 3.3 inches and stands 0.6 inches high, weighing 0.1 kilograms, so it fits in a small clear area on any flat surface.

How is the USB-powered unit installed, and what step do people miss?

Connect a USB source for power, plug line-level sources into the three 3.5 mm inputs, then long-press each channel button to choose Stereo or Mono mode — skipping the mode selection leaves channels in the default state.

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