INSTRUCTIONS for 10B-STD,
10B-SUB and 10B-LR CROSSOVERS
The 10B crossover is available in three stock versions; 10B-SUB incorporating frequencies
more suitable to sub-woofer applications (40Hz to 500hz), 10B-STD which is more
applicable to speakers requiring frequency control in the mid-band and tweeter areas (70Hz
to 4500Hz) and the 10B-LR, which uses plug in resistor programming cards to set the
crossover frequency. Both the 10B-SUB and 10B-STD crossovers include a mode called
Mono Low Pass
(see below
)
which replaces the
Two Way Mono
(Linkwitz-Riley) mode in
older model 10B's. The
Two Way Mono
mode (see below) is retained in the 10B-LR
allowing for very steep (non Linkwitz-Riley) 8
th
order filters.
MONO LOW PASS mode
(10B-SUB and 10B-STD only)
:
The 10B-STD and 10B-SUB crossovers generate a summed low pass output signal by first
summing or adding together the left channel and right channel input signals to form a left
plus right (L+R) signal. If the MODE switch (located on the rear panel) is in the
Mono Low
Pass
position then this L+R signal is fed into both of the low pass filter sections (Left and
Right) available in the 10B. As a result, the common low pass output can be taken from
either of the two low pass (LP) outputs; either left LP out or right LP out. These outputs are
designated as Left and Right for convenience only. If the low pass output used is the one
designated as the left channel, then the crossover frequency and slope (or filter order)
switches on the left side of the unit's front panel (as viewed from the front) will control the
low pass filter parameters. Likewise, if the right channel low pass output is used, then the
right channel switches will control its filter parameters. There is no interaction between the
two sets of controls. If one of the two low pass filters is not used, then settings of its
crossover frequency and slope switches are irrelevant and will have no affect on the
performance of the other filter sections of the crossover. The two high pass filter sections
(left and right) operate independently in
Mono low Pass
mode.
STEREO mode:
As in the older versions of the 10B, the stereo mode provides two, two way crossovers
wherein the left input is fed into a separate low pass filter and a separate high pass filter,
both of which are independently adjustable from the front panel controls. Likewise, the right
input signal is fed into a separate low pass filter and a separate high pass filter, both of
which are independently adjustable from the front panel controls. All four filters have
separate output connectors on the rear panel. There is no interaction whatsoever between
left and right channels or between low pass and high pass filters.
THREE WAY MONO mode
(10B-LR only)
:
Available only in the 10B-LR (Linkwitz-Riley filters), this mode is the same as in the older
model 10B. The four filter sections (two low pass and two high pass) of the 10B are
combined to form a single channel three way crossover providing one low pass, one mid or
band pass and one high pass filter. The mid (or band pass) filter is formed by combining the
left channel high pass and the right channel low pass filters into a single filter wherein the
lower end of the pass band is determined by the left channel high pass controls and the
upper end of the pass band is determined by the right channel low pass controls
