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:
Efficiency 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 efficiency
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 flange
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®
is a registered trademark of DuPont.
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®
is a registered trademark of DuPont.
Nomex
®
is a registered trademark of DuPont.
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®
is a registered trademark of Rubatex Corporation.