APOGEE ACOUSTICS Full Range Ribbon Speaker System, Owner'S Manual And Assembly Instructions

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APOGEE PASSIVE CROSSOVER
INTRODUCTION
The Apogee passive crossover is designed to provide the electrical
separation of woofer and midrange-tweeter signals. This is accomplished
at signal levels between the pre-amplifier and power amplifiers in a
manner to provide the most coherent and musically accurate result. This
passive approach requires selection of loading resistors to provide the
ultimate performance.
LOADING RESISTORS
These resistors are chosen according to table CX-1 depending upon
amplifier listed in the table for convenience. If your amplifier is not
listed, consult your Owner's Manual, or your local dealer.
The load resistors may be changed by removing the bottom panel of the
crossover. They are soldered to gold plated pins/sockets for easy
removal.
All
crossovers are shipped standard with 20K
OHM
input
impedences. Others should be changed according to table CX-1. Resistors
presoldered to gold pins are available form your local dealer. These
resistors are shown as RHI & RLO in figure CX-1. RHI is chosen
according to the input impedence of the midrange-tweeter amplifier
while
RLO
is selected according to the input impedence of the bass
amplifier.
ADJUSTMENTS
The system balance between bass and midrange-tweeter is adjustable via
the front panel controls. These attenuators provide 11 dB of
attenuation in 1 dB steps. When the attenuators are set to "0", the
crossover will provide 6 dB more gain to the midrange-tweeter than the
woofer amp. This will be modified by any gain change between the bass
amp and midrange tweeter amps. For amplifiers of equal gain, position
"7" or "8" is expected to provide proper balance.
INPUT IMPEDENCE
The crossover input impedence is 10K
OHMS.
This is expected to function
properly with most modern pre-amps. Some pre-amps may function properly
into a 50
K OHM
load. Apogee also offers such a unit. Consult your local
dealer if you have questions.
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