Owner’s Enjoyment Manual
®
APPENDIX C -
Building Your Own
Crossover Modules
An electronic crossover divides your music into two or
more frequency bands. Since speakers can only be designed
to accurately reproduce a limited range of frequencies, a
crossover must be used to send the appropriate information
to each speaker.
The correct selection of crossover frequencies greatly
depends on your choice of a subwoofer. Please check with
the subwoofer manufacturer for their recommendation
regarding a good crossover point.
The Richter Scale comes with a programmable 24dB/
octave Linkwitz-Riley crossover. It is preset at the factory at
90Hz. This frequency is easily be changed by removing the
top of your unit and replacing the existing resistor module in
the socket. New modules are available either from your
authorized AudioControl dealer or directly from our factory.
If you are feeling adventurous and are handy with a solder-
ing iron, you can easily make your own resistor modules.
Here’s how...
To calculate the proper resistor value for the custom
module, use the following formula:
7200
Frequency (Hz) = Resistor value (kilohms)
For example, if you need a crossover point of 150Hz:
7200 ÷ 150Hz = 48 kilohms
For a 24dB/octave crossover module, you need eight
resistors and a 16 pin DIP component header. The resistors
used to build the module should be 1/4 watt, 1% tolerance,
metal film.
NOTE: If you would like more information about building
crossover modules, check out Technical Note# 1005 - Building
Crossover modules at www.audiocontrol.com
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Summary of Contents for Richter Scale Series III
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