Detailed Description Of Ecu - Infinity MODULUS Service Manual

Modulus
DESCRIPTION OF MODULUS ECU ( E lectronic C ontrol U nit)
This description of the role of the Modulus ECU is a somewhat more detailed description that is
included with the Owner's manual
I DESCRIPTION
The Modulus ECU is an active electronic crossover intended to be connected between your system
preamplifier and your subwoofer & satellite loudspeakers. It contains variable controls for gain, phase
and crossover frequency. (see graph #1 for typical effects of the crossover control)
The high-pass filter section of the ECU is a passive, capacitive 6dB/octave filter. The output is the RCA
jacks marked "High-Pass Output" at the rear of the unit. If this filter is used alone without the need
for the low-pass section to a powered subwoofer (special din cable), the power to the ECU may be
turned off. Even the power cord to the unit may be removed.
II HOOK-UP INSTRUCTIONS
Input jacks are used to connect your preamp output to the ECU. Even though there are two sets for the
Right and Left channel input, either set of jacks may be used as they are in parallel. If the unit is being
used for only one channel of a "stereo" set-up, a Y-cable is recommended to split the signal and
enter both right and left channel jacks.
The supplied cable (Din to RCA) is then connected from the ECU to the input of your power amplifier or
receiver.
The High Pass Output jacks are used to connect the high pass output to your satellite speaker's
amplifier. These jacks are also in parallel.
III USE OF DIP SWITCHES
The D ual I n-line P ackage switches at the rear of the unit (moved up or down with a small tool or pencil
point) will affect the high pass crossover frequency. Actually, two factors will affect the frequency - the
input impedance of your satellite amplifier and the position of the DIP switches. Since you cannot raise
the input impedance of your amplifier it is going to be the determining factor as to how much range
(adjustment) you are going to have when choosing a high pass crossover point.
impedance is, the more range you will have. (A typical input impedance is 47k W .)
Refer to the option guide below as a starting point. If followed, the resulting crossover point will be 140
Hz. For other crossover points, refer to these conclusions:
7
The higher the