Orion XTREME 1200 Owner's Manual page 35

FINE TUNING THE LOW-PASS CROSSOVER
The crossover section is marked at four frequency points for
ease of system adjustment. These points are 45 Hz, 175 Hz ,
600 Hz and 5,000 Hz. Specific crossover points can be to be
chosen based on the recommended operational bandwidth
of your speakers.
There are three small dots on the frequency range dial.
These dots represent commonly used ORION crossover fre-
quencies. These crossover frequencies are 85 Hz, 2,500 Hz
and 3,500 Hz respectively.
page 35