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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🎛️ Mix like a pro, wherever you go!

PLUG PLAY READY - Includes 12V adapter for instant use—just add a UK plug adapter if needed.
CRYSTAL CLEAR AUDIO - Premium 4580 op-amps ensure ultra-low noise and pristine signal integrity.
MONO MIXING MASTERY - Seamlessly blend 4 audio sources into one clean output for pro-level sound.
SPACE SAVING DESIGN - Compact footprint fits perfectly on any desktop, pedalboard, or studio setup.
TAILORED VOLUME CONTROL - Individual knobs let you fine-tune each channel’s level with precision.

The Behringer MX400 is a compact 4-channel mono line mixer designed for musicians, podcasters, and studio pros. Featuring ultra-low noise 4580 op-amps and individual level controls, it blends multiple audio sources into a single, clean output. Its small size and included 12V adapter make it an essential, ready-to-use tool for streamlined, professional audio mixing.

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Product Dimensions	10.36 x 5.72 x 4.65 cm; 0.28 g
Item model number	MX400
Country Produced In	china
Mixer Channel Quantity	4
Colour Screen	No
Power Source	Battery Powered
Voltage	12 Volts
Item Weight	0.28 g

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

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