Krell Industries MASTER REFERENCE SUBWOOFER - Manual (Page 14)

(SECTION ONE: About Krell continued)
8
(Drivers continued)
Two 80 oz. strontium ferrite magnets are affixed to the custom-made, cast
magnesium speaker frame. The magnet assembly has been contoured to produce
a powerful, focused, magnetic field. A robust, doped (reinforced) paper cone,
chosen for its high strength and low weight, is affixed at one end to the speaker
frame via a special rubber surround. This surround has a unique geometry that
resists cavitating (turning inside out) under high pressures. At the other end of
the cone, Krell utilizes a dual-spider arrangement in order to maintain the superi-
or alignment of the concentric mechanical assembly under all performance con-
ditions. An extra-long voice coil controls the drivers even at maximum excursion.
Krell Core Technologies
Krell CAST and Krell Current Mode
These circuit topologies combine to transmit audio waveforms between compo-
nents in the current rather than the voltage domain. Krell components using Krell
Current Mode circuitry and CAST technology perform as if they are part of a single
circuit. The resulting speed and bandwidth produce outstanding accuracy and
realism in music reproduction.
Krell Proprietary Output Devices
Loudspeaker control is paramount in any audio system. Control is even more critical
in subwoofers, in which the audio band is limited to the extreme low frequencies.
Krell amplifiers are known for the control they exert on even the most complex
loudspeaker loads. Part of this capacity is a result of the proprietary output devices
used in all Krell amplifiers. These devices, manufactured for Krell by Motorola,
allow for high gain and low output impedance. These circuits enable the amplifier
to deliver enormous amounts of current with relative ease and with less distortion.