XVR1 CROSSOVER
The XVR1 electronic crossover network is the result of several years research into
the actual needs of loudspeaker designers. It is a stereo two-way biamplification
network which can be combined with additional networks to form either simple
or very complex crossover networks with virtually unlimited adjustability of filter
characteristics. Each high and low pass filter is user configurable as 6, 12, 18, or
24 dB per octave slope, and each “pole” of the four slope settings is independently
adjustable from 22 Hz to 18,000 Hz.
In addition, there are two independent Q (sharpness) controls for each filter. This
gives something like 28 million possible settings per filter. Not all of these settings
will be useful, but the circuit can be used to achieve just about any setting worth
imagining, and allows flexibility and performance greatly beyond what has been
previously available.
The discrete circuitry for every stage consists of matched low noise JFETs driving
bipolar output transistors, all biased single-ended with constant current sources. The
crossover features balanced and unbalanced inputs and outputs, and individual level
controls for each channel’s high and low pass outputs.
The XVR1 uses an external power supply which is designed to power two crossover
chassis, suitable for a three way system. It is expandable beyond this with additional
power supplies and crossover units.
Pass Labs, PO Box 219, Foresthill, CA 95631, Tel: 530.367.3690, Fax: 530.367.2193, www.passlabs.com
PASS LABS
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