The mixer is the heart of any PA system and a staple in recording studios. Not sure what to look for when buying? Here’s a compact, practical overview.

Without a mixer (mixing desk, mixing console) things get messy fast — on stage, in the rehearsal room or at any venue where several signals must be handled in parallel. A mixer combines multiple inputs, processes them and routes them onward — e.g., to a power amp/PA or a computer.
It provides channels with suitable inputs (XLR/jack) and sound-shaping tools. Levels are adjusted using faders or rotary controls.
Many mixers include built-in effects. Classics such as EQ and compressor appear even in entry-level gear. Larger — especially digital — desks add delay, chorus, phaser, flanger and more.
Typical applications:
From compact 2-channel mixers to large consoles with dozens of inputs — the choice is huge.

The “right” mixer depends on the job. For simultaneous instrument recording, you need enough channels/inputs. If the mixer should also work as a computer audio interface, USB is a must. See Use cases for typical setups.
Popular brands: Yamaha, Behringer, PreSonus, Mackie, Dynacord, Allen & Heath, Solid State Logic (SSL)
By the way: Many models are also available as 19″ rack mixers — ideal for fixed racks.
You’ll encounter these terms again and again — here’s a brief explanation.
The core of any mixer — usually repeated many times. Master one channel strip and the rest feels familiar. Typical components:

Buses combine several signals (e.g., master bus, subgroups for drums/vocals). Depending on the model they’re controlled by faders or knobs; digital consoles often assign controls to several functions via layers (see Digital mixers).
Level meters prevent clipping and protect your gear. Smaller desks offer a master meter, larger ones provide a meter per channel.
Use groups to control multiple channels together — e.g., the entire drum section with a single fader.
Built-in effects save space, speed up workflows and are cost-effective. Alongside EQ/compressor you’ll often find:

Effect quality varies by price class. High-end consoles offer excellent algorithms, but mid-range and entry-level gear can be very usable too.
Tip: First define your core needs (channels, routing, I/O), then your must-have effects — and finally match the budget. Choosing becomes much easier.
Broadly, there are analogue and digital mixers. In addition, hybrid models combine both worlds.

Analogue mixers use fully analogue circuits. Advantage: one function = one control — intuitive, everything at a glance.
Pros:
Consider: Analogue settings can’t be stored. If you need repeatable setups or prefer compact gear with many functions, a digital mixer may suit you better.

Digital mixers excel in flexibility and features. Controls can be assigned to layers — keeping size down despite a large channel/feature set.
The biggest practical benefit: store & recall scenes. Prepare complex shows and trigger them at the press of a button.
Advantages:
Consider: The learning curve is steeper than analogue. If you invest the time, you’ll gain tremendous control.
Depending on specification you may find:

Hybrid desks combine analogue signal paths with digital control/DSP or an integrated USB audio interface. The exact feature set varies by model.
Where does each mixer type shine? Here are some practical scenarios:
Live mixers need to be robust, offer enough channels and, where needed, solid effects — yet remain portable. For large events, 32+ channels are common.
Today, digital live desks are often the first choice because…
For band rehearsals, a small analogue mixer often suffices (e.g., 4 channels for vocals/keys). 12/16-channel models offer more flexibility.

In principle, almost any mixer can feed a sound card (mini-jack), but a USB-equipped mixer acting as a computer audio interface is far more convenient.
Important for PC recording:
USB on a mixer does not automatically mean “digital mixer” — many analogue models include a built-in USB audio interface.

More comfort, protection and efficiency with the right mixer accessories:

DJ mixers don’t strictly belong to PA, but they’re an important sub-category. They usually offer fewer channels but include all core DJ functions in a compact format:
Many models integrate tightly with PC setups; with trigger pads you can fire samples, cues & effects on the fly.
A PA mixer (mixing console) is the heart of a sound system. It collects signals from microphones, instruments and players before routing them to the loudspeakers.
A mixer lets you control levels, tone (EQ), effects and the interaction of multiple channels. Without it, achieving a clean, balanced live sound is difficult.
Analogue mixers are straightforward, easy to use and often more affordable. Digital mixers add more features — built-in effects, scene/preset storage and frequently app control.
For small bands, DJs or club events, compact 6–12 channel mixers are ideal. Popular brands include Behringer, Yamaha, Mackie.
Yes. Many current models include reverb or delay — especially useful for vocals — so external FX units are often unnecessary.
Many mixers feature an integrated USB audio interface, allowing direct recording on a computer or playback from a laptop.
Connect the mixer’s main outputs (XLR or jack) to powered speakers, or to a power amp that drives passive speakers.
An aux send creates separate mixes — e.g., for stage monitors or external effects. Multiple auxes can be configured per application.
Yes. Many digital mixers support tablet/smartphone remote control — handy during soundcheck and for adjustments from the audience area.
Digital mixers with many channels, scene memory and flexible routing, e.g., Behringer X32 or Yamaha TF series, are proven choices.
Flight cases or padded bags protect during transport. For outdoor use, add weather protection.