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Compact black box with two 3.5mm inputs and four headphone outputs, volume knobs per channel, 12V power jack, 6.7 by 2 by 1.26 inches

Audio-Technica 2-in 4-out Headphone Amplifier 3.5mm Mixer

SKU CH-X7R4-5N72T

A compact 2-input, 4-output headphone amplifier lets two sources feed four listeners with independent volume control

  • TypeAdapter
  • Audio12v Adapter;amp body
  • Power Requirementfalse
  • Features12v Adapter;amp body
  • Weight0.38 kilograms
  • Four users monitor independently with separate volume controls
  • Two stereo sources mix into four headphone outputs
  • NJM4556A op-amp delivers 14 dB gain with ultra-low noise
  • 12 V adapter powers unit for studio or stage use
  • Ultra-compact 6.7×2×1.26 in enclosure weighs 7.8 oz

2-in 4-out Headphone Amplifier

The Audio-Technica unit is a compact stereo mixer that accepts two 3.5 mm sources and drives four independent headphone outputs. Each channel has its own volume control so up to four listeners can set personal levels without affecting the others. A 12 V power adapter is included for studio or stage use.

Four-channel headroom and independent gain

Four NJM4556A-based amplifiers deliver 14 dB of clean gain per channel, maintaining low noise even at maximum volume. The design handles two playback devices simultaneously, but only four headphone outputs are provided, so larger groups need additional distribution. No battery option is mentioned, so mains power is required.

Replaces single-output splitters and basic Y-cables

Unlike passive splitters that halve signal level, this amplifier preserves dynamics and lets each listener adjust volume separately. It upgrades simple monitoring setups where one source feeds multiple headphones, but it does not add extra inputs beyond the two stereo pairs. Buyers needing more than two sources or more than four outputs should look elsewhere.

Highlights

  • Four users monitor independently with separate volume controls
  • Two stereo sources mix into four headphone outputs
  • NJM4556A op-amp delivers 14 dB gain with ultra-low noise
  • 12 V adapter powers unit for studio or stage use
  • Ultra-compact 6.7×2×1.26 in enclosure weighs 7.8 oz

Specifications

BrandAudio-Technica
TypeAdapter
Audio12v Adapter;amp body
Power Requirementfalse
Features12v Adapter;amp body
Weight0.38 kilograms

Questions about this item

Will this 3.5 mm mixer work with my older 6.35 mm headphones?

The amplifier has 3.5 mm outputs; 6.35 mm headphones need a 3.5 mm to 6.35 mm adapter, which is not included.

How can I confirm the NJM4556A op-amp is delivering clean output after I connect everything?

Play audio through both inputs and verify each of the four channels produces clear sound at independent volume levels without audible noise.

Does the package include the 12 V power adapter and cables, or must I buy them separately?

A 12 V 1 A power adapter is supplied; input and headphone cables are not included.

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