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.
It helps to understand why this matters. A balanced cable carries the audio on two conductors with opposite polarity plus a shield. Any interference picked up along the run hits both conductors equally, and the monitor’s input cancels it out. An unbalanced TS cable has no such trick, so a long run acts like an aerial and you hear hum and hiss. For short desktop runs you may get away with unbalanced, but balanced is the right habit. Buy cables a little longer than you think you need so you are not pulling them taut, and avoid coiling excess cable tightly against power leads.
Step-by-step: connect monitors to an interface
- Power everything off and turn the monitor volume knobs all the way down.
- Identify your interface outputs. Use the main line outputs (often labelled Output 1/2 or Main L/R), not the headphone jack.
- Run cable to the left monitor: interface Output 1 (Left) to the left monitor’s input.
- Run cable to the right monitor: interface Output 2 (Right) to the right monitor’s input.
- Set the monitors’ input sensitivity (if they have a switch) and any room/trim controls to neutral for now.
- Power on in order: interface first, then the monitors last. This avoids speaker pops.
- 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.
Setting and matching levels properly
Getting the gain structure right matters as much as the cabling. The aim is to do most of your level control in software and on the interface’s monitor knob, while leaving the monitors’ own volume controls fixed at a sensible reference point. If you crank the monitors to maximum and then run your interface output very low, you amplify the noise floor and any hiss becomes obvious. Instead, set both monitor volume dials to roughly the same position — many have a centre detent or a marked unity point — and use the interface for day-to-day adjustment.
Check that the left and right channels are balanced. Play a mono reference track or a centred vocal and confirm the image sits dead centre between the speakers. If it pulls to one side, your two monitor dials are not matched, or a cable or output is at a different level. Many engineers settle on a fixed monitoring level for mixing so their ears learn a consistent reference; a moderate, conversational listening volume protects your hearing and keeps your judgement reliable over a long session.
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.
Common mistakes to avoid
- Using guitar (TS) cables: they look similar to TRS but are unbalanced, so they invite noise. Check for the two rings on the jack before you commit.
- Connecting to the headphone jack: the headphone output is convenient but lower quality and harder to level-match than the dedicated line outputs.
- Swapping left and right: easy to do behind a desk. Confirm the channel that should be on your left is actually on your left, or your stereo image is mirrored.
- Powering monitors on first: doing this before the interface has settled is the usual cause of a loud thump through the speakers.
- Ignoring the back-panel switches: many monitors have input sensitivity, high-pass or room-correction switches set at the factory. Leave them neutral until you know what each does.
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.
Can I leave my studio monitors switched on all the time?
You can, but it is better to power them down when you finish for the day. Doing so saves energy, reduces wear, and avoids leaving the tweeters exposed to any stray pops from other gear. Always turn the monitors off before the interface, the reverse of your start-up order.
Do I need to match the cable length on both sides?
Not for level or timing reasons — a few extra metres on one side makes no audible difference. Matching lengths is mainly tidiness, and keeping both runs reasonably short helps reduce noise pickup. Far more important is that both cables are balanced and in good condition.
