How to Connect Studio Monitors

To learn how to connect studio monitors, the short version is this: run a balanced cable from each output of your audio interface to the matching input on each monitor, set levels low, then power on. Active (powered) monitors connect directly to your interface — no separate amplifier needed. Here is the full, practical walkthrough.

What you need first

• A pair of active studio monitors (most home monitors are active, with built-in amps).
• An audio interface with two line outputs. This is the recommended source — see do studio monitors need an interface.
• Two balanced cables matched to your gear’s connectors.

Choose the right cables

Monitors typically use one of two balanced inputs: XLR or TRS (the 1/4-inch jack with two rings). Your interface’s outputs are usually TRS. So you most often need:

• TRS-to-XLR cables (interface TRS out to monitor XLR in), or
• TRS-to-TRS cables (if the monitor has TRS inputs).

Use balanced cables (TRS or XLR), not unbalanced TS guitar cables. Balanced connections reject noise and are the reason a clean monitoring chain stays quiet. You need one cable per monitor — two total for stereo.

Step-by-step: connect monitors to an interface

1. Power everything off and turn the monitor volume knobs all the way down.
2. Identify your interface outputs. Use the main line outputs (often labelled Output 1/2 or Main L/R), not the headphone jack.
3. Run cable to the left monitor: interface Output 1 (Left) to the left monitor’s input.
4. Run cable to the right monitor: interface Output 2 (Right) to the right monitor’s input.
5. Set the monitors’ input sensitivity (if they have a switch) and any room/trim controls to neutral for now.
6. Power on in order: interface first, then the monitors last. This avoids speaker pops.
7. Set levels: raise the interface monitor knob to a moderate position, then slowly bring up each monitor’s volume to a comfortable, matched level.

Connecting without an interface

You can connect monitors straight to a computer or phone via the headphone output using an adapter (e.g. 3.5mm to two TRS or XLR cables). It works, but the sound is usually noisier and you lose proper level control. An interface gives cleaner, balanced output and is strongly preferred for any serious work.

Connecting to a mixer

If you use a mixer, run its main or monitor/control-room outputs to the speakers with balanced cables, the same way. For how interfaces and mixers differ, see audio interface vs mixer.

Avoiding hum, hiss and pops

• Power-on order: source first, monitors last; reverse when shutting down.
• Use balanced cables end to end to reject interference.
• Avoid ground loops: plug your gear into the same outlet/strip where possible. Persistent hum can be a ground-loop issue.
• Keep cables tidy: route audio cables away from power cables to reduce induced noise.

After you connect: position them

Connecting is only half the job. Position the monitors in an equilateral triangle with tweeters at ear height and some distance from the wall — follow our monitor positioning guide. A little acoustic treatment goes a long way too. For more setup help, see the audio interface setup guide and the studio monitors hub.

Frequently asked questions

Do I need an amplifier for studio monitors?

No, if they are active (powered) monitors, which most home studio monitors are. The amplifier is built in. You only need an amplifier for passive monitors, which are far less common in home setups.

XLR or TRS — which should I use?

Either works; both are balanced. Use whatever matches your interface outputs and monitor inputs. XLR locks in place and is common on monitors, while TRS is common on interface outputs, so TRS-to-XLR cables are a frequent choice.

Why do my monitors hum?

Usually a ground loop or unbalanced cabling. Try balanced cables, plug all gear into the same power strip, and check your power-on order. If the hum changes with the volume knob, the issue is in the signal path; if it does not, suspect grounding.