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(SECTION THREE: Anatomy of a Loudspeaker continued)
Cabinet Material
The LAT sides are constructed of extruded 6063-T5 aluminum. The rigid, dense
rear baffle made of 6061-T6 aluminum absorbs any vibration from the driver cones.
Using this heavy, inert metal means minimal vibrations—no matter how much power
the loudspeakers handle—and thus no loss of sound.
Crossover Design
Each group of driver units (tweeter, midrange, and woofer) on the LAT–1000 and
LAT – C1000 has its own dedicated crossover circuit board. Each circuit board is
made of 1/8-inch fiberglass and has a number of unique elements. To minimize
parasitic inductance and resistance, small capacitors are connected in parallel,
and air-core inductors are wound with oversize wire. In addition, each capacitor is
placed in its own plastic case, making it virtually immune to vibrations and pres-
sure variations. This design allows each drive unit to handle its portion of the music
signal without strain, maximizes power delivery, and increases signal linearity while
minimizing resistance and inductance. High-current polypropylene film capacitors
are used exclusively in the audio signal path.
Similarly, the resistors in the crossover networks are connected in parallel to mini-
mize parasitic inductance and maximize current capacity and power dissipation.
Oversized, high-power, metal oxide and wirewound resistors are used exclusively.
All the inductors are air-core types; they suffer from none of the nonlinearities at low
signal levels and saturation at high signal levels that iron-core inductors exhibit. All
the inductors are wound with oversize wire, reducing parasitic resistance to a fraction
of an Ohm. In addition, the inductors in the midrange and tweeter filter networks are
wound with Litz wire for extended high-frequency linearity.
Drivers
The LAT–1000 drivers are designed with very high power handling for enhanced
dynamics. The tweeters feature machined aluminum faceplates. The midrange
drivers feature magnesium cones coupled to a rubber surrounds. The 8" woofers
are designed with low loss linear suspension and aluminum cones, and a unique
spider configuration dampens driver-born resonances.
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