How to choose studio monitors: size, room and placement first

Studio monitors are speakers built to tell you the truth about a mix rather than to flatter it. That is the whole job. A good pair lets you hear a muddy low-mid, a harsh vocal or a kick that is too quiet, and fix it before the track leaves your room.

Most buying advice starts with brands. This guide starts somewhere less exciting and more useful: your room, your desk and your budget for things that are not speakers. Get those right and a modest pair will serve you for years. Get them wrong and no pair will.

Step 1: Measure the room before you shop

Write down three numbers: the width of the wall your desk faces, the distance from that wall to where your head will be, and the height of your ears when you sit. These decide more about your purchase than any review.

Genelec's placement guide is a good, plain reference here. It recommends placing the listening position "at least one metre from the walls" and avoiding "the exact centre of the room", because room resonances (standing waves) pile up bass in some spots and cancel it in others. It also says to set up symmetrically on the room's left-right axis, so reflections are similar for both speakers and the stereo image stays honest.

If your desk is jammed into a corner of a small bedroom, that matters more than whether you buy a 5-inch or an 8-inch speaker. Often the best upgrade is moving the desk. Our guide to acoustic treatment on a budget covers what to do about the walls.

Step 2: Pick a woofer size for the room, not for your ego

Monitors are usually sold by woofer size: 3 to 4 inches, 5 inches, 6.5 inches, 8 inches. Bigger woofers reach lower and play louder. That sounds like pure gain, but in a small, untreated room, extra low end mostly excites room modes. You hear boom, not detail, and you end up mixing the bass too thin to compensate.

A rough rule we use:

• Small bedroom, untreated, sitting about a metre from the speakers: 5-inch. Enough low end to judge most of a mix, not so much that the room takes over.
• Medium room with some treatment: 6.5 to 7-inch.
• Larger, treated room: 8-inch, or a 5-inch pair plus a subwoofer set up properly.

Sub-4-inch "desktop" monitors are fine for checking balance and for small spaces, but you will need headphones or a second reference to judge the bottom octave. Our guide to mixing on headphones explains how to make that pairing work.

Step 3: Read the frequency-response spec properly

Every monitor lists a frequency response, and most buyers read only the lowest number. The catch is the tolerance printed next to it, if it is printed at all.

Yamaha's HS series is a useful example. The overview page lists the 5-inch HS5 at 54Hz to 30kHz with no tolerance, and the specs page confirms that figure is the -10dB range. Its sibling, the HS5I (the version with mounting points), gives both: 54Hz to 30kHz at -10dB, and 74Hz to 24kHz at -3dB. The -10dB figure tells you where the speaker still makes some sound. The -3dB figure tells you where it is still close to full level. For judging bass in a mix, the -3dB number is the honest one. When a spec sheet gives a single low figure with no tolerance, assume it is the generous one and compare models on the same basis.

The low-end figure matters most if you make bass-heavy music. A kick fundamental around 50 to 60Hz, or an 808 sliding lower, sits below what a small monitor reproduces at full level. You can still mix it, but you will be judging it by its harmonics and checking it elsewhere.

Step 4: Know what the features are for

• Active (powered) vs passive. Almost every home-studio monitor is active: the amplifier is built in and matched to the drivers. Yamaha describes the HS models as "bi-amplified", meaning separate amplifiers for woofer and tweeter. Choose active unless you already own a good amplifier.
• Ported vs sealed. A bass port (a hole, front or back) extends low end; the HS series is "bass-reflex", which is the same idea. Rear ports need space behind the speaker, so check how close to the wall you can place it.
• Room and EQ switches. Many monitors include controls to cut bass when the speaker sits near a wall; Yamaha calls its versions ROOM CONTROL and HIGH TRIM. Use them. They exist because placement changes the sound.
• Inputs. Balanced XLR or TRS inputs are the norm and are worth using. Check that your audio interface has matching outputs, and buy balanced cables.

Step 5: Budget for the whole setup

A pair of monitors on a desk, pushed against a wall, is a different product from the same pair set up well. Before you spend everything on speakers, set aside money for:

• Stands or isolation pads to get the tweeters to ear height and decouple them from the desk.
• Balanced cables of the right length.
• Some basic absorption at the first reflection points, if you have none.

If the choice is between a better speaker and stands plus treatment, the stands and treatment usually win.

Step 6: Set them up

Genelec's guide gives clear numbers, and they are worth following exactly:

1. Place the two monitors and your head at the corners of an equilateral triangle, with a 60 degree angle between the speakers.
2. Aim each monitor at your listening position.
3. Put the acoustic axis (usually the tweeter) at ear level, ideally 1.2 to 1.4 metres from the floor. If you place them higher, tilt them down, but by no more than 15 degrees.
4. Keep both speakers the same distance from the side walls and the wall behind.
5. If bass seems to vanish at certain notes, move your chair forwards or backwards a little; Genelec notes this can get you out of a room-mode null.

Then play music you know very well, on purpose, and adjust before you mix anything. A few reference tracks will tell you in minutes whether the low end is believable.

Step 7: Listen before you commit

If you can, buy from a seller with a return window and test at home, because a showroom tells you how the speaker sounds in the showroom. Listen for whether vocals sit clearly in the centre, whether you can hear reverb tails, and whether the bass changes a lot as you lean forward and back. Do not choose the pair that sounds most exciting in the first five minutes; the HS series page itself pitches honesty over "added bass or treble frequencies which may sound more flattering at first", and that is the right test for any brand.

What we think

The monitor market sells speakers, but home producers mostly have a room problem. We think a beginner with a 5-inch pair, correctly placed and set to the room, will make better mix decisions than one with 8-inch monitors shoved against a wall in a square bedroom. The bigger speaker gives you more of the room's mistakes, louder.

Our less obvious take is that the most important spec is not on the box: it is the distance from the back of the speaker to the wall, and from your head to the side walls. Measure those first, pick the smallest monitor that covers your music, and spend the difference on stands and a few panels. Then learn that pair deeply. Familiarity with one honest system beats a quick upgrade cycle every time.