PARAMETER DEFINITIONS
Znom: The nominal impedance of the driver in
Ohms.
Revc: DC resistance of the driver in ohms, also
known as Re.
Sd: The functional radiating surface area of the
cone assembly in meters 2.
BL: Efciency of the voice coil and magnet
system in Tesla meters.
Fo: Free air resonance. Also known as Fs.
Vas: Volume of air having the same compliance
(springiness) as the driver’s suspension.
Cms: Restorative force of the driver’s
suspension in micrometers/Newton.
Mms: The total mass of the moving parts of the
loudspeaker, including the air load, in grams.
Qms: Resonance characteristics of the
mechanical factors of the loudspeaker.
Qes: Resonance characteristics of electrical
factors of the loudspeaker.
Qts: Resonance characteristics of the electrical
and mechanical factors combined together.
Xmax: Distance the cone can move in one
direction before the coil begins to leave the
magnetic gap.
Le: Inductance of the voice coil in millihenries.
SPL: Typical sound pressure level at 1 watt, 1
meter.
no: Electrical to acoustical conversion efciency
in percent.
Vd: Air displacement of the driver from negative
Xmax to positive Xmax.
Pmax: Maximum continuous program power in
watts.
Disp: Volume displaced by the driver inside the
cabinet when mounted on its rear ange
Kapton
®
is a registered trademark of DuPont.
Kevlar
®
is a registered trademark of DuPont.
Nomex
®
is a registered trademark of DuPont.
Rubatex
®
is a registered trademark of Rubatex Corporation.
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