With jack adapters, is it possible to use this to play sound from 2 computers to a single output?

I know this is an old question, but for the benefit of others reading these, I'll answer it. In THEORY - YES, but in practice, not advised. You'd need to feed pc1 left into input 1, pc1 right into input 2, pc2 left into input 3 and pc2 right into input 4. You'd then get 1 output (consisting of a mono output of left AND RIGHT channels from both pc's on a single socket - as I said, less than satisfactory. Far better use the Xenyx 502, which will support stereo outs!

Does it work on 240 volts?

The power input is for 12 volts, but in the UK it comes with an adaptor so it can run off the mains supply (which is nominally 230 volts).The information on the adaptor states that it can handle voltages from 100 to 240 volts and draws 300 milliamps.Output is 12volts Direct Current - 150 mA.

Would this work between a low impedance mic to an active speaker like most bands use now?

I use it for line level instruments into a guitar amp, which works fine. It has quarter inch inputs, not cannon, so any mics would need to use quarter inch cables. There is no gain or eq, so I would probably go for a mixer with more controls for a band. Saying that, it’s only £20, so if it doesn’t work as you want, you can always use it to chain four more inputs into a larger mixer.

Since its mono, I'd only hear a signal through one speaker or do I hear same signal through both of my speakers? My speaker only has one 3.5 mm cable.

Depends on your cable. I assume your 3.5 mm cable is stereo, this will produce sound in 1 speaker. use a stereo>mono adapter to get same sound in both speakers.

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Behringer MX400 MicroMIX 4-Channel Mono Line Mixer for Guitar, Synth, Podcast & Studio, Ultra Low-Noise Audio Blender with Level Controls, 12V Adapter Included

Behringer MX400 MicroMIX 4-Channel Mono Line Mixer for Guitar, Synth, Podcast & Studio, Ultra Low-Noise Audio Blender with Level Controls, 12V Adapter Included

Product ID: 48215608

Details

Brand
Behringer
Connectivity technology
1/4" TS
Item weight
0.01 Ounces
Number of channels
4
Product dimensions
103D x 46W x

⚡12V DC power adapter included

🔇ultra-low noise 16dB floor

🎚️4 mono channels for precise blending

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Description

🎛️ Elevate your sound game—mix like a pro, wherever you are!

PLUG PLAY READY - Includes reliable 12V adapter for instant setup—just connect and start mixing without delay.
COMPACT POWERHOUSE - Space-saving design fits effortlessly on your desk or pedalboard—studio-grade mixing anywhere you go.
CRYSTAL CLEAR SOUND - Premium 4580 op-amps ensure ultra-low noise performance, preserving every detail of your mix.
MONO MIXING MASTERY - Seamlessly blend up to 4 audio sources into one clean output—perfect for guitar, synth, or podcast setups.
PRECISION VOLUME CONTROL - Dedicated level knobs on each channel let you fine-tune your sound with professional accuracy.

The Behringer MX400 MicroMIX is a compact 4-channel mono line mixer designed for blending multiple audio sources with ultra-low noise and precise level control. Ideal for musicians, podcasters, and home studios, it features premium op-amps for crystal-clear sound, a space-saving footprint, and comes ready to use with a 12V power adapter included.

Specifications

ASIN	B000KGYAYQ
Audio Input	Auxiliary
Best Sellers Rank	6,273 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 1 in Unpowered Audio Mixers
Brand Name	Behringer
Connectivity Technology	1/4" TS Connectors
Country of Origin	China
Customer Reviews	4.2 4.2 out of 5 stars (2,551)
Global Trade Identification Number	04033653020633
Item Dimensions D x W x H	103D x 46W x 103H millimetres
Item Weight	0.01 Ounces
Manufacturer	Behringer
Manufacturer Part Number	MX400
Model Number	MX400
Noise Level	16 Decibels
Number of Channels	4
Output Connector Type	Jack 3.5 mm
Power Source	DC Power Supply
Product Warranty	Community. Musictribe. Com. Support.
UPC	689076752374 700315912479 738878219612 133587590951 411378073051
Unit Count	1.0 count
Voltage	12 Volts

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