Deck controls
Platter
The platter is the driven metal disc a record sits on, spun by the motor beneath it. Its mass stores rotational energy, which is what holds speed steady when a hand touches the record above it.
In practice
The platter is the driven disc with real mass. A jog wheel imitates it; a motorised controller platter is one.
Keep the top surface clean, because grit between platter and slipmat changes how the mat slides and shows up as inconsistent cueing. Never lubricate a direct-drive platter bearing without knowing what it takes. If a platter wobbles visibly it is either seated badly or the spindle is worn, and both are audible as pitch instability long before they are visible. On motorised controllers, the platter is usually removable for transport — check it is properly seated after every move.
Mass
The specification that matters
Under the mat
Where grit causes problems
Wobble
What you hear before you see
Where these come from: Turntable platter design and maintenance practice — established engineering, not catalog figures. For what we can measure, see the motor driving it.
Why it matters
Mass is the specification that matters and the one nobody quotes. A heavy platter keeps turning when you hold a record still and resists being slowed by the stylus, which is why a light platter feels vague under a hand even on a deck with adequate torque.
It is also the reference point for every jog wheel ever designed. Motorised controller platters exist specifically to reproduce this feel, and the reason they only partly succeed is that reproducing mass is harder than reproducing motion — a driven disc with real inertia behaves in a way a sensor cannot fully model.
Frequently asked
Is a platter the same as a jog wheel?+
No. A platter is a driven disc with real mass that a record sits on; a jog wheel is a control designed to feel like one. Only the platter has inertia.
Does platter weight matter?+
Yes. Mass stores rotational energy, so a heavy platter holds speed under a hand where a light one feels vague — which is why it is a real difference between decks with similar torque figures.
Do motorised controllers have real platters?+
Some do, and they are genuinely driven discs rather than sensors. They get much closer to the feel of a turntable than a standard jog wheel, and they are considerably more expensive.
Related terms
Jog wheel
A jog wheel is the round control on a media player or controller used to nudge, scrub and scratch. Its touch-sensitive top behaves like a record; its outer ring bends pitch without stopping playback.
Torque
Torque is the rotational force a turntable’s motor applies to the platter, usually quoted as start-up torque in kilogram-centimetres. High torque means the platter reaches speed almost instantly and resists being slowed.
Slipmat
A slipmat is a felt disc between the turntable platter and the record. It lets the platter keep spinning while you hold, drag or pull back the record itself, which is what makes cueing and scratching possible.
Turntable
A turntable spins a record at a constant speed while a stylus tracks its groove. A DJ turntable adds a pitch fader, high torque so it reaches speed instantly, and a platter you can hold and release.
Explore: Beginner mixing guide · Turntable · Slipmat · All DJ terms