The choice between MM and MC cartridge compatibility is the most misunderstood decision in turntable setup — and getting it wrong means either buying a phono preamp that doesn’t work with your cartridge or paying for MC capability you don’t need. Moving magnet and moving coil cartridges produce fundamentally different output levels and impedance characteristics, which means they require different gain and loading settings from the phono stage that amplifies their signal. Specifically, this guide explains what separates the two cartridge types at a technical level, what the difference sounds like in practice, how to identify which type your turntable uses, and which phono preamp to match to each. For a broader explanation of what a phono preamplifier actually does in the signal chain, the preamp explainer covers that foundation clearly.
Quick answer: Moving magnet (MM) cartridges output around 3–6mV and are easy to amplify — most phono preamps at any price handle MM. Moving coil (MC) cartridges output 0.2–0.6mV — roughly ten times less — and require significantly more gain and precise impedance loading. An MM-only preamp will not work correctly with an MC cartridge. An MC-capable preamp works with both. Most entry and mid-range turntables use MM cartridges.
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How Cartridges Work — The Core Difference
A phono cartridge converts the mechanical movement of the stylus tracking a record groove into an electrical signal. Specifically, both MM and MC cartridges use electromagnetic induction to do this â