The power a speaker or amp can handle all day without damage — the number that actually matters more than “peak” watts.
RMS (root mean square) power is a continuous, sustained rating — the amount of power a speaker or amplifier can handle indefinitely without overheating or distorting badly. “Peak” or “max” power ratings describe brief bursts only and are far less useful for matching gear.
When pairing an amplifier to a speaker, the safest approach is to match RMS power ratings reasonably closely, with the amp's RMS output at or slightly above the speaker's RMS handling — counterintuitively, an underpowered amp pushed into clipping is more likely to damage a speaker than a correctly sized one.
| Context | Typical Home Audio | Typical Car Audio |
|---|---|---|
| Bookshelf speakers | 50 – 100 W RMS | — |
| Component speakers | — | 60 – 120 W RMS |
| Subwoofers | 150 – 500 W RMS | 300 – 1,000+ W RMS |
