Roll off Frequency- (Fo). The most common means of measuring the rolloff point of a system is to
note frequency where the energy is 3dB less than that in the passband.
Sealed- An enclosure of finite size that has no exchange of air between the inside volume and the outside
world. Commonly used to control cone motion in acoustic suspension woofers.
Sensitivity- The sensitivity of power amplifier is that input voltage which will result in reaching full rated
output. For a speaker it is the acoustic output as measured at one meter away with one watt of input.
Shelving- In equalizers if the response curve is to be boosted or cut through a certain range of frequen-
cies in an equal amount, it is said to be a shelving equalizer. The resulting response curve has a flat area
that resembles a shelf.
SPL- Sound Pressure Level. The measure of sound pressure (loudness), expressed in dB.
Transducer- Any device that converts one form of energy into another. A microphone converts sound
energy into electrical energy and a speaker converts electrical energy into sound.
Transient Response- The ability of an amplifier or speaker to follow sudden changes in audio levels.
Translucent- Clear. NOT opaque! See Fiberglass!
Tweeter- A driver used to reproduce the upper range of the musical spectrum, usually from 3.5KHz to
20KHz.
Vas- The volume of air having the same compliance as that of a driver, measured in cubic feet or liters.
Vented- Ported. When an enclosure has the capability of exchanging air from that inside the enclosure
with the outside world through a tuned orifice it is said to be vented or ported.
White Noise- It is a type of noise that has equal energy per Hertz.
Woofer- A driver designed to reproduce low frequencies. In car audio it is usually restricted to 100Hz and
below. A woofer that is used down below 40Hz can be called a subwoofer.
Z- See impedance.
Kicker Technical Tips
Page 18
Vol. 1
Dr. Koneairea’s Discussion of Terms
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