4. Horn Balance- (not a control on the PRO-3X), the balance between the low rotor and horn
volume is adjusted with the Mid control and the low rotor amplifier’s volume and EQ
settings.
-Simulator (Sim) controls-
The PRO-3X low rotor simulator speed is controlled by the LED footswitch. The ramp times
and terminal speeds are internally adjustable. The sound of the simulator is separated into two
bands. The “Low” setting is similar to a close microphone sound such as you may hear on a
recorded rotary speaker. The “High” setting adds more texture and room type reflections to the
sound, similar to standing in a room with the rotary speaker. Both settings can be adjusted to
preference.
Low- primarily adds “Throb” to the sound and operates > below 300 Hz.
High- primarily adds richness and complexity to the sound, operating above 300Hz
Speed LED – pulsates with the low rotor simulator’s speed.
-Internal Speed/Ramp Controls-
The PRO-3X uses electronic speed control for all dynamics of the horn and low rotor simulator.
A Precision low noise DC motor and ball bearing horn rotor are utilized providing a zero
maintenance, modern rotary horn system. Factory settings are to a well used but maintained 147
type speaker. Do not oil motor or horn bearings. A range of adjustment is provided to allow for
personal preference. Take note of the original settings in case you want to return to stock
calibration.
Accel – (R52 horn) (R51 Sim) Trims the ramp up/down time the horn and simulator.
Fast – (R47 horn) (R49 sim) Sets the terminal fast speed of the horn and simulator
Slow – (R48 horn) (R50) sim) Sets the terminal slow speed of the horn and low rotor. The
range of adjustment includes stop.
*Re-trimming of fast/slow may be necessary after large acceleration adjustments.
Power amplifier/motor drive PC board. See internal access instructions.
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