Sensitivity
Sensitivity states the sound-pressure level produced for a specified electrical input under stated measurement conditions.
It describes output for that input, not maximum loudness. Keep the input reference, distance or fixture and test frequency with the value.
Sensitivity — Subwoofer
For a subwoofer, sensitivity can describe acoustic output for a stated amplifier input or, on a passive design, electrical drive. These references are not interchangeable.
Compare the same input basis, distance and frequency. An active subwoofer’s voltage reference does not directly compare with a passive driver’s watt-based rating, and sensitivity does not establish maximum bass output.
Sensitivity — Loudspeaker
For a loudspeaker, sensitivity is commonly stated at one metre for either one watt or 2.83 volts. Those references coincide at eight ohms but not at every impedance.
Compare the same drive reference and measurement conditions. On a hybrid powered design, identify which section the rating describes; a sensitivity figure alone does not establish amplifier requirements or maximum output.
Sensitivity — Super Tweeter
For a super tweeter, sensitivity indicates output in its intended high-frequency band for a stated input. It helps assess the level matching needed with the main loudspeaker.
Compare the same drive reference, distance and frequency range. A level adjustment may be needed for integration; sensitivity does not define the safe crossover frequency or power limit.
Sensitivity — Headphone
For headphones, sensitivity is often stated per milliwatt or per volt at a specified frequency. Converting between those references requires the corresponding impedance.
Compare the same reference and acoustic measurement basis. A per-volt figure cannot be compared numerically with a per-milliwatt figure, and sensitivity alone does not establish a comfortable or safe listening level.