## What Sensitivity Means
Loudspeaker sensitivity is measured at one metre from the cabinet with one watt of input power, in an anechoic environment, and reported as a sound pressure level in dB SPL. A sensitivity rating of 96 dB/1W/1m means that cabinet, driven with one watt, produces 96 dB SPL at one metre.
This single figure encodes transducer efficiency, the gain of the horn or waveguide, and the acoustic contribution of the enclosure. High sensitivity generally indicates efficient transducer-and-horn design. It is not, on its own, a quality indicator — a poorly designed horn can produce high sensitivity with poor directional control or high distortion.
## The 3 dB Rule and Amplifier Power
Decibels are logarithmic. A 3 dB increase in SPL requires doubling the amplifier power. Conversely, a 3 dB increase in sensitivity means the same SPL from half the amplifier power.
Consider two cabinets: one rated at 93 dB/1W/1m, another at 96 dB/1W/1m. To deliver 120 dB SPL: the 93 dB cabinet requires approximately 500W. The 96 dB cabinet requires approximately 250W. The sensitivity difference has halved the required amplifier power — and with it, the cost of the amplifier rack, the generator capacity, and the cable infrastructure.
## Sensitivity at Distance
SPL falls at 6 dB per doubling of distance for a point source. From 96 dB at one metre: approximately 76 dB at 10 metres, approximately 56 dB at 100 metres. A cabinet with 10 dB greater sensitivity produces the same SPL at 100 metres as a lower-sensitivity cabinet does at 32 metres.
Over long throw distances, sensitivity differences compound decisively. For large-scale production, sensitivity is a primary determinant of total system cost — sensitivity built into the cabinet is sensitivity that does not need to be purchased in the amplifier rack. SSOUNDS treats transducer and horn efficiency as primary design objectives for this reason.