Power Needed
2.9W
With Headroom
12W
Room
Small Room
Minimum Power
2.9W
RMS per channel
With 6dB Headroom
12W
Distance Loss
9.7 dB
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Inputs
Result
At 3.05m distance: SPL needed at 1m = 85 + 20×log10(3.05) = 94.7 dB. Power = 10^((94.7-90)/10) = 3.0W. With 6 dB headroom: 12W.
Inputs
Result
Higher SPL target and lower sensitivity require significantly more power. An amp rated 200W RMS would be appropriate.
Depends on room size, speaker sensitivity, and target volume. With 90 dB sensitivity speakers at 10 ft: background music needs ~1W, normal listening ~10W, party volume ~30W, concert level ~100W+.
| Target SPL | At 10 ft (90 dB sens) | At 15 ft (90 dB sens) | At 10 ft (85 dB sens) |
|---|---|---|---|
| 80 dB | 1W | 2.5W | 3.2W |
| 85 dB | 3.2W | 8W | 10W |
| 90 dB | 10W | 25W | 32W |
| 100 dB | 100W | 250W | 320W |
Sensitivity is the SPL a speaker produces with 1 watt at 1 meter, rated in dB. Higher sensitivity = less power needed. Every 3 dB increase in sensitivity halves the wattage requirement.
Music has peaks 6-10 dB above average level. Without headroom, peaks clip and distort. A 6 dB headroom means 4x your average power. If normal listening needs 10W, your amp should deliver at least 40W.
No. Doubling watts adds only 3 dB, barely noticeable. To sound "twice as loud" (+10 dB) you need 10x the power. Going from 10W to 100W doubles perceived loudness. This is why sensitivity matters more than raw watts.
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Last Updated: Mar 20, 2026
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