Speaker Sensitivity Explained
Sensitivity specifies SPL at 1 metre with 1 watt, in dB SPL/1W/1m. The 2.83V/1m alternative equals 1 watt only into 8 ohms per IEC 60268-5 clause 17. Higher sensitivity requires less amplifier power.
IEC 60268-5:2003§17, 18AES2-2012
1W vs 2.83V
2.83V delivers 2 watts into 4 ohms, inflating apparent sensitivity by 3 dB. Always check which method is specified.
Ranges
Home bookshelf: 82-86. Studio monitors: 85-92. PA: 95-102. Line arrays: 100-110/element. Each 3 dB halves required power.
Efficiency
Percent = 10^((sensitivity-112)/10). 90 dB/W/m = 0.63%. Most speakers under 5%. Remaining energy = heat.
Power Calculation
+3 dB above sensitivity = double power. Distance doubling = +6 dB (4x power). Add 10-15 dB headroom for music peaks.
Try It Now
Measure speaker sensitivity