Wattage and Volume

An amp's wattage is regularly misunderstood by beginners — it is not a direct measure of "how loud", and more watts is rarely what you need at home. Two relationships clear up most of the confusion.

Watts ≠ double the volume — Loudness is perceived logarithmically. Doubling the wattage brings only about 3 dB more — a change hardly heard as "twice as loud". A perceived doubling takes roughly ten times the power. So the wattage rating says less about volume than many think; the speaker's efficiency (see "Speakers") often contributes more.

The tube connection: headroom — On tube amps, wattage mainly decides when the amp moves into saturation. A small 5-watt tube amp breaks up nicely at room volume — handy for recording and practice. A 50- or 100-watt amp stays clean far longer and only breaks up at stage volume, which is unusable in a living room.

Practical framing — For practice and recording, a few watts almost always suffice; the old "more watts = better" reflexes come from the era before microphones and PA systems. Anyone wanting the tube breakup quietly is better served by a small amp or a master-volume/attenuator than by a big one that only sounds good loud.

No wattage is "right" — it only has to suit the room and the desired balance of clean headroom and breakup.