Had a customer in the shop last week complaining that all his records sounded “wrong” but he couldn’t quite put his finger on what was off. I asked him to bring his turntable in, and sure enough — it was running about 2% fast. Not enough to be immediately obvious, but enough to make everything sound slightly sharp and anxious.

Speed accuracy is one of those things that doesn’t get talked about much when people are buying turntables, but it’s fundamental. You can have the best cartridge and the cleanest records in the world, but if your turntable’s not spinning at the right speed, you’re not hearing the music the way it was meant to be heard.

What We’re Actually Talking About

When we say “speed accuracy,” we mean how precisely your turntable maintains 33⅓ RPM (or 45 RPM for singles). That’s 33 and one-third revolutions per minute, if you want to be pedantic about it.

Now, nothing’s perfect. Every turntable has some tolerance. But good turntables stay within about ±0.1% of the target speed. Cheaper ones can be off by 2-3%, or even more if the motor’s on its way out or the belt’s stretched.

Doesn’t sound like much, right? But 2% fast means every note is sharp by about a third of a semitone. Your brain notices that, even if you don’t consciously register it.

How to Tell If Your Speed’s Off

The most obvious sign is if you know an album really well and it sounds wrong. Too slow and it’ll sound sluggish, muddy, like someone’s put a slight damper on everything. Too fast and it sounds bright, aggressive, slightly manic.

Vocals are usually the giveaway. If you know what David Bowie’s voice sounds like and suddenly he sounds like he’s been inhaling helium (or sulfur hexafluoride), your speed’s off.

But here’s the catch — if you’ve only ever heard your records on one turntable, and that turntable’s consistently off by the same amount, you might never notice. You just think that’s what the record sounds like.

Why It Happens

Belt-drive turntables are the usual culprits. Belts stretch over time, motors wear out, pulleys get dirty. Direct-drive tables are generally more stable, but they can still drift if the electronics are failing.

Sometimes it’s environmental. If your turntable’s on a surface that’s not quite level, that can affect speed consistency. Temperature can play a role too — belts behave differently when they’re cold.

I’ve seen tables where the speed’s fine when you first turn them on but drifts after twenty minutes as things warm up. That’s usually a sign the motor’s on its way out.

The Pitch Control Myth

A lot of people think if their turntable has a pitch control slider, they’re covered. And yeah, you can use that to correct speed issues. But pitch controls are really designed for DJs who need to beatmatch, not for correcting manufacturing defects or worn-out parts.

If you’re having to adjust your pitch control significantly away from zero to get accurate speed, something’s wrong with your turntable. You’re compensating for a problem, not solving it.

How to Check Your Speed

Easiest way is with a strobe disc. They’re cheap, you can get them online or at most hi-fi shops. You put it on the platter, shine a light on it (some turntables have built-in strobes), and if the patterns appear to stand still, your speed’s accurate. If they’re moving, you’re off.

There are phone apps that claim to measure turntable speed, but I’m skeptical. They can give you a rough idea, but they’re not precise enough to be reliable.

Or you can do what I did when I was starting out — play something where you know exactly what pitch the notes should be, and check them with a tuner. Tedious, but it works.

What to Do If Your Speed’s Off

First, check if your turntable has any adjustment screws or trim pots for speed calibration. Some do, usually on the underside or near the motor. Your manual should tell you where they are and how to adjust them.

If it’s a belt-drive, the belt might just need replacing. Belts are cheap. I replace mine every couple of years as a matter of course.

If it’s a direct-drive or if replacing the belt doesn’t help, you probably need someone who knows what they’re doing to look at it. Motors can be reconditioned, electronics can be recalibrated, but it’s not really DIY territory unless you’re handy with a soldering iron.

Does It Really Matter?

Depends how much you care about hearing music accurately, I suppose. Some people don’t mind. Some people can’t tell the difference.

But if you’re spending money on good pressings, if you’re hunting down original copies of albums because you want to hear them the way they were meant to sound, then yeah, it matters. Speed accuracy is just as important as tracking force or anti-skate or any of the other parameters people obsess over.

Your records deserve to spin at the right speed. It’s not about being an audiophile snob. It’s just about respect for the music.