Krell Industries RESOLUTION 1 - Manual (Page 17)

(SECTION THREE: Anatomy of a Loudspeaker continued)
13
Enclosure
The Resolution Series loudspeaker enclosures feature a Medium Density Fiber-
board (MDF) design. Excellent resistance to vibration is achieved using a minimum
1" thickness of MDF. The baffles of all Resolution loudspeakers are 2" thick, which
further damps unwanted resonance. In addition, the liberal use of internal bracing
deadens the enclosures. Ideal operating environments for the midrange and
tweeter drivers are provided by specialized sub-enclosures that isolate these driv-
ers from the resonant effects of the woofer drivers. Large radiuses at the rear cor-
ners of the enclosure reduce the effect of internal standing waves, and contribute
to the refined appearance of the loudspeakers.
Crossover Design
Each group of driver units (tweeter, midrange, and woofer) has its own dedicated
crossover circuit board. Each circuit board is made of double-sided fiberglass and
has a number of unique elements. To minimize parasitic inductance and resist-
ance, multiple capacitors are connected in parallel, and air-core inductors are
wound with oversize wire. This design allows each drive unit to handle its portion of
the music signal without strain, maximizes power delivery, and increases signal lin-
earity. High-current polypropylene film capacitors are used liberally 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, wirewound resistors are used exclusively.
All the inductors are air-core types; they do not suffer from any of the nonlinearities
at low signal levels or 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.
Krell Resolution 1, 2, 3, and C Loudspeakers continued ᮣ