Can it mix four sources at once?

Yes. Four inputs are summed into one stereo output, and each channel has its own volume knob so you can balance them.

Does it work with headphones?

Yes. The NJM3414 op-amp delivers up to 70 mA, which is enough to drive most headphones directly from the output.

What power supply does it need?

A DC supply from 5V to 12V with a 5.5 x 2.1 mm barrel plug. The supply is not included.

Can I connect a microphone?

Not well. It has no mic preamp or phantom power, so it is meant for line-level sources such as phones, players and synths.

What connectors does it use?

3.5 mm stereo sockets for the inputs and output. Adapters are needed for 1/4-inch or XLR gear.

No. It has no crossfader, EQ, cue or effects. It is a simple four-channel summing box.

Where is the AU-401 Stereo Audio Mixer cheapest?

At Walmart, for $15.27, as of our latest check.

Unbranded

AU-401 Stereo Audio Mixer

Best price now

$15.27at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

Unbranded

AU-401 Stereo Audio Mixer

Best price now

$15.27at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $15.27 at Walmart on Nov 10.

Our take on the AU-401 Stereo Audio Mixer

The AU-401 is a small metal stereo mixer that combines four audio inputs into one stereo output. Each channel has its own volume knob, so levels are set independently. It runs on DC 5V–12V through a 5.5 x 2.1 mm barrel jack and uses an NJM3414 op-amp rated for up to 70 mA, enough to drive headphones directly or feed an amplifier. It suits hobbyists and tinkerers who need a cheap passive-style summing box for line-level sources, not a DJ or studio mixer: there are no faders, EQ, effects, cue or mic preamps, which is where it parts ways with proper DJ mixers.

Best forHobbyists summing several line-level sourcesHeadphone monitoring from multiple devicesSmall DIY audio and synth setupsFeeding a powered speaker or amp from several players

Pros

Four inputs to one stereo output
Independent volume knob per channel
Drives headphones directly
Small metal housing
Low quiescent current around 8 mA

Cons

No EQ, faders, cue or effects
3.5 mm sockets only, no 1/4-inch or XLR
Fixed gain of about 2x
Needs an external DC power supply, not included
No mic preamps or phantom power

AU-401 Stereo Audio Mixer prices at every store

WalmartNew
In stockSold by CQ DecorReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$15.27Free shippingChecked Nov 10
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About the AU-401 Stereo Audio Mixer

The AU-401 is a stereo audio mixing board that combines four audio inputs into one stereo output. It can drive headphones directly or connect to an amplifier.

Each channel has its own potentiometer, so the volume of each channel is set independently and does not affect the others. The mixer uses an NJM3414 low-voltage, high-current operational amplifier. Its maximum driving current is 70mA, which lets it drive various earphones and external amplifiers. The amplification is about 2 times.

It runs on DC 5V-12V power through a DC 5.5 x 2.1 connector. The quiescent current is about 8mA. The housing is metal.

Power: DC 5V-12V, DC 5.5 x 2.1 connector
Quiescent current: About 8mA
Max drive current: 70mA
Amplification: About 2 times
Op-amp: NJM3414
Volume control: Individual potentiometer for each channel
Material: Metal
Color: Blue
In the box: 2 x audio mixer

Specifications

color: BlueSource

Questions and answers

Can it mix four sources at once?: Yes. Four inputs are summed into one stereo output, and each channel has its own volume knob so you can balance them.
Does it work with headphones?: Yes. The NJM3414 op-amp delivers up to 70 mA, which is enough to drive most headphones directly from the output.
What power supply does it need?: A DC supply from 5V to 12V with a 5.5 x 2.1 mm barrel plug. The supply is not included.
Can I connect a microphone?: Not well. It has no mic preamp or phantom power, so it is meant for line-level sources such as phones, players and synths.
What connectors does it use?: 3.5 mm stereo sockets for the inputs and output. Adapters are needed for 1/4-inch or XLR gear.
Is it a DJ mixer?: No. It has no crossfader, EQ, cue or effects. It is a simple four-channel summing box.
Where is the AU-401 Stereo Audio Mixer cheapest?: At Walmart, for $15.27, as of our latest check.