Remote Data Access Terminal (Rdat) - Rockford Fosgate SYMMETRY EPX2 Installation & Operation Manual

The crossover points for high-pass, bandpass, and low-pass may be
adjusted independently. (All pass outputs do not have crossover
points.) The most flexible feature is that crossover point adjustments
may be made in real time. With the EPX , crossover points can be
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dynamically adjusted while listening. In addition, the user is not
limited to the handful of crossover points offered by most crossover
manufacturers. Each filter in the EPX can be set to 1 of 256 possible
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frequencies, for a total of 72,057,594,000,000,000 (72 quadrillion)
unique crossover combinations.
All crossover points are represented both graphically and numerically
on the LCD display of the RDAT. High-Pass, Bandpass, and Low-Pass
transfer functions are realistically simulated on a calibrated logarith-
mic frequency scale. The exact crossover frequency is displayed
numerically.
features a fadable crossover with constant bass low-pass
The EPX
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outputs. It has outputs for both the Front and Rear of the system. Front
and Rear crossover settings for these outputs can be adjusted indepen-
dently. A fadable crossover allows the user to fade the system from
front to back for just the right amount of front stage / rear fill. The
constant bass low-pass outputs provide low-pass information regard-
less of the position of the fader.

Remote Data Access Terminal (RDAT)

The RDAT makes the EPX a unique and powerful signal processor.
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The RDAT is, in reality, a very powerful computer. It coordinates the
operation of the power supply, preamp, equalizer, and crossover
sections of the EPX , so that they all work together in perfect harmony.
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The RDAT also provides the all-important link with the user. To
ensure ease of operation, a menu driven software architecture was
selected for the user interface. In this type of system, options are
presented to the user on the RDAT's large 40 character by 2 line
display. To select a particular option, the user simply presses the
function key that corresponds to the desired menu selection.
The RDAT contains a 16 bit microcontroller that runs at 20mHz. It has
a program capacity of 32k bytes and an 8k byte bank of nonvolatile
storage (saves settings when disconnected from the battery). Since all
software is written in assembly language, program coding is tight and
performance is optimal.
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