Learning how to set up a PA system comes down to a repeatable order: position your speakers, connect your sources to the mixer, send the mixer to the speakers, then set levels carefully from quiet to loud. Get that sequence right and you avoid the two things that ruin gigs — feedback and a muddy, lifeless mix.
This guide walks through a small-to-medium PA the way a working engineer would set one up for a band or solo act in a bar, hall, or rehearsal space.
What a basic PA system is made of
A typical small PA has four parts: input sources (microphones and instruments), a mixer, an amplifier (built into powered speakers, or a separate amp for passive ones), and the speakers themselves. Many small rigs also add monitor wedges so performers can hear themselves, and a subwoofer for low-end reinforcement.
If you are still deciding what speakers to buy, read our explainer on powered vs passive PA speakers first, since that choice changes how you wire everything together.
Step 1: Position your speakers
Place your main speakers (the “tops”) on stands at the front of the stage, angled slightly inward toward the audience and raised so the drivers fire over people’s heads rather than into the backs in front. Keep the mains in front of any microphones — a mic positioned behind or level with a speaker is the most common cause of feedback. If you have a subwoofer, put it on the floor centred between or just inside the tops.
Step 2: Connect your sources to the mixer
Run microphones into the mixer’s input channels with balanced XLR cables. Line-level instruments like keyboards usually take a TRS or XLR input, while guitars and basses with passive pickups should go through a DI box first — see how to use a DI box on stage for the why and how. Switch on phantom power only for the channels that need it (condenser mics), and leave it off for dynamic mics and DI outputs unless the manual says otherwise.
Step 3: Connect the mixer to the speakers
Send the mixer’s main outputs to your speakers. With powered speakers, that is a single balanced cable per speaker from the main out (or via a thru connection between speakers). With passive speakers, the mixer feeds a power amplifier, and the amp’s speaker outputs run to the cabinets with speaker cable — never instrument cable. Set up monitor sends to your wedges or in-ears at this stage too.
Step 4: Set your gain structure
Before any fader goes up, set the input gain (trim) on each channel one at a time. Have the source make sound at performance volume, then raise the gain until the channel meter peaks healthily without lighting the clip indicator. Good gain staging here gives you a clean, punchy mix with headroom to spare. Our guide to gain staging covers the same principle that applies in the studio.
Step 5: Bring up levels and ring out the system
With faders at their starting marks, bring up the master and then each channel until the mix sits at a comfortable level for the room. Walk the floor and listen from where the audience will be — the mix at the desk is never the mix in the seats. If anything rings or squeals, pull that channel’s gain or notch the offending frequency before pushing further. A short soundcheck with the full band locks everything in.
Common PA setup mistakes to avoid
- Speakers behind the mics — guarantees feedback.
- Master fader cranked, channels low — set channels first, master last.
- Using instrument cable for passive speakers — it can overheat and fail.
- Skipping gain staging — leads to noise, distortion, or no headroom.
- Mixing only from the stage — always check the front-of-house sound.
Frequently asked questions
What do I plug in first when setting up a PA system?
Power up the mixer first with all faders down, then your sources, and switch the powered speakers (or amplifier) on last. When shutting down, reverse it — speakers off first — to avoid a loud pop through the system.
How loud should a PA system be for a small gig?
Loud enough to fill the room evenly without anyone in the front row wincing. Set the system so vocals sit clearly on top of the band at a comfortable level, then check coverage from the back of the room rather than chasing volume from the desk.
Do I need a separate amplifier for my PA?
Only with passive speakers, which need an external power amp. Powered (active) speakers have the amplifier built in, so you connect the mixer straight to them — simpler for most small and mobile setups.
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