Behringer MICROMIX MX400 Ultra Low-Noise 4-Channel Line Mixer, Black

I needed something that would allow me to connect multiple instruments to my Boss RC-1 looper pedal so I could layer them all on the same pedal through the same amp. I've bought a few Behringer guitar pedals before, and I've had mixed feelings about them. They were really cheep and sounded good enough, but were made of flimsy plastic. This mixer is a different story. The housing is metal and everything feels sturdy, very impressive.Basically, the mixer has 4 mono 1/4 size input jacks and 1 mono 1/4 size output jack. It requires a 12v power adaptor, but it comes with one, which is really nice. The included power adapter did feel a little flimsy, but it works fine and only takes up one outlet space. Setup was easy, I was able to connect my drum machine, synthesizer, guitar, and bass, to the mixer. I do wish that the input jacks were more spaced out though. Really, the only cables that are going to fit are ones with straight connectors. I had a lot of trouble with my right angle patch cables, they didn't fit. I made it work, luckily I had some straight cables.The mixer works really well, sounds good, etc. I do wish it had a power switch, it's a little annoying having to unplug it every time I want to turn it off, but I can't argue with the price and build quality.I did notice that my guitar and bass sounded really nasty when I turned the volume knobs on the mixer up past 50%, but that may have just been the nature of the instruments and the presets on other gear in my setup. Those instruments sounded fine when the mixer knobs were kept low and other volume knobs elsewhere were turned up.Overall, Behringer really outdid themselves with this little mixer. The price is unbeatable and it works just as expected. It's really great to have this tiny thing I can stick onto the side of my pedal board instead of having to use a huge mixer board. Definitely would recommend.

[I'm adding one more edit to my review: Because Amazon lists both the mono mixer and the headphone splitter versions of this product as drop down selections when purchasing, reviews are all over the place. I'm not sure why this is but these products are total opposites in an audio signal chain. It really is insane, one version mixes down 4 mono signal inputs into 1 mono signal output (creation side) and the other version, I assume because it isn't what I bought, splits 1 stereo signal input into 4 stereo outputs (listening side). So, do you need to mix 4 instruments into one source or do you need to allow 4 people to decide how loud they want their headphones? lol]I bought this to use as a sub-mixer for my Behringer 1202fx mixer because I needed more inputs for all my synthesizers. It works as I expected it to. One of the pots feels a little gritty but it works fine (no noise.)Some reviews are complaining about using it with TRS connectors... well this is a mono mixer you need to use plain mono 1/4-inch TS instrument cables. I do run a Korg Volca FM and a Bastl Microgranny through it but I use 3.5mm-TRS-to-1/4-inch-TS cables to do this (bc while those synths output 3.5mm stereo it is just mono sound on L&R channels so nothing is lost.. as far as I'm concerned). Otherwise most synths output with mono 1/4-inch-TS so if you are willing to mix down multiple mono signals into a single mono 1/4-inch-TS (instrument cable) this is the piece of gear you need.My other use for this box will be to run my 2x Moog Mother-32s and a Moog DFAM into it and output to any guitar amp for an easy on-the-go use (watch your gain staging here though because guitar amps are expecting a tiny-tiny signal from guitar pickups not line-level like this outputs. keep that amp volume low low low). So in short this mixer is perfect for git-er-done mono signal combining.I can't speak to the long term durability of this unit but it has metal housing, it works now and it is cheap as dirt.

This is a great little mixer. It's tough (I already dropped it 3 feet onto a wood floor, no damage), and it's quiet.To save you looking it up, the nominal input impedance is 4.7K, the output impedance 80 ohms. This will match up with pretty much any other electronic amps, mixers, or strange boxes you might put downstream. Note that with solid state components "impedance matching" is not something you shoot for. What you want is low impedance outputs feeding high impedance inputs, which is referred to as bridging. In this context "high" usually means kilohms rather than megohms.Those who speak of noise problems might do well to check their connections, especially the way their shielding and/or grounding are arranged. Not just in this mixer, but all tiny-black-chip electronic components are virtually noise and distortion free in audio applications. It's the nature of the beast. You might want to check my own note 2 below: this is a line level mixer.But note two points:1. It's mono, not stereo.2. This is a line-level mixer, and "line" means a nominal one volt. "Nominal" because the voltage actually varies all over the place, but one volt is the planning number. Generally, most things that plug into the wall, or are battery powered output line level, even if by another name. This includes most headphone outputs, including those on keyboards--though of course I don't know about your equipment specifically.Importantly, this is not a preamp, not an amp, and most certainly not a microphone amplifier. Most mixers have a small amount of gain built in and the MX400 is no exception, but it's not nearly the gain most mics require. If a mic all by itself does happen to work with this or any line-level mixer that's fine, but it's just luck.Used for what it is, a tough, quiet, inexpensive, no-frills line-level mixer, this thing shines. No wonder they can't keep them on the shelves.