Infinity MODULUS Owner's Manual page 2

We at Infinity Systems, Inc. would like to take this opportunity to thank you
for choosing the Modulus Subwoofer and commend you on your choice. The
Modulus Subwoofer is a fully self-contained, 250 watt, servo-controlled sub-
woofer system able to achieve levels of performance that are unrivaled by
similar systems. In order to bring out the best from your Modulus Sub-
woofer, itis important that you read through this manual before connect-
ing and operating your subwoofer.
If any of the instructions in this manual are not clear or if you have any
additional questions about installing or using your Modulus Subwoofer, you
should contact your dealer or Infinity Systems for clarification.
UNPACKING THE SUBWOOFER
As you have undoubtedly noted, the subwoofer is extremely heavy, so
Please use caution when unpacking and handling it. Help from a second
person is recommended when removing the subwoofer from its shipping
carton.
The subwoofer cabinet is finished in a baked polyester resin that is durable
and resistant to scratching and marring. However, the finish can be damaged
if improperly handled. Care of the subwoofer cabinet is contained in a special
section later in this manual.
If the subwoofer, or any of its associated parts was damaged in transit,
contact your dealer, or carrier immediately.
The contents of the subwoofer carton should be checked to ensure that
the following items are included:
1. Subwoofer
. Electronic Control Unit (ECU)
. Four (4) black metal isolation feet
. Four (4) black plastic isolation feet covers
. One (1) packet of silicone adhesive
6. One (1) 25 foot cable with DIN connectors at each end.
The subwoofer packing materials should be saved in case the subwoofer
needs to be repackaged for reshipment at a later date.
As a minimum, save the packaging materials until you are sure your
subwoofer is not damaged and is operating properly.
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THE SUBWOOFER
The subwoofer includes the speaker, the power amplifier, and the input
panel. The power amplifier is the black aluminum structure located on the
tight-front corner of the enclosure. The input panel is located on the bottom of
the enclosure and the speaker is located behind the enclosure grille. Also
located behind the grille, in the lower-right corner, is a red LED to indicate
when the subwoofer input panel POWER switch is set to ON. This red LED
indicates that the subwoofer is in the standby mode and ready to play.
Subwoofer Input Panel
The subwoofer input panel (figure 1), located on the bottom of the sub-
woofer, contains the controls and connectors required to make your subwoofer
work with your system.
INPUT connector — is a DIN connector that is used to connect the
subwoofer to the ECU.
POWER switch — turns the A.C. power on and off.
A.C. VOLTAGE SELECTOR -— sets the subwoofers power supply to
conform with the A.C. line voltage at the user's location. The subwoofer is
normally shipped with this switch set to 110 volts.
A.C. Line Cord - connects the A.C. power from the wall outlet to the
subwoofer.
Power ON LED - lights when the POWER is set to ON.
ELECTRONIC CONTROL UNIT
The Electronic Control Unit (ECU) is an electronic device that is connected
between your system preamplifier and the subwoofer. The ECU controls the
subwoofer allowing the owner to make adjustments for optimum output
regardless of the placement of the subwoofer.
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AC. VOLTAGE SELECTOR
CAUTION
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Figure 1. Subwoofer Input Panel
ECU Front Panel
The ECU front panel (figure 2) contains the controls and switches for
crossover, phase, level and power to your subwoofer.
CROSSOVER contro! — sets the upper limit of the subwoofer frequency
response. The upper limit is where the subwoofer begins to roll off to meet
the low frequency output of your satellite speakers.
PHASE contro! — used to optimize the blend of the subwoofer with the
satellites when the subwoofer cannot be placed in the best room location
due to room layout or space. The phase control is variable from 0 to 180°.
The contro! is normally set fully counterclockwise (0), but can be set
anywhere within its rotation.
LEVEL control — sets the subwoofer volume.
LOW CUT selector — rolls off the response of the subwoofer at either 22Hz,
or 35Hz. The normal setting is 35Hz. However, if a particular recording
does not have rumble, or if the volume of the overall music being played
is not excessively loud, then 22Hz can be used.
POWER switch — turns the A.C. power to the ECU on and off and activates
the subwoofer.
Power ON LED - lights when power is applied to the ECU.
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Figure 2. ECU Front Panel
ECU Input/Output Panel
The ECU input/output panel (figure 3) contains the switches and jacks that
allows you to connect the ECU to your system and set up the voltage and high
pass circuits.
HIGH PASS FREQUENCY DIP switches — used to select the ECU internal
capacitor value to match the satellite amplifier input impedance. The
capacitor value selected will create a 140Hz cutoff frequency at 6dB/oc-
tave. A complete discussion of the high pass circuit is contained in the ECU
Initial Settings section of this manual.
OUTPUT connector — supplies subwoofer A.C. control voltage and the low
frequency signal to the subwoofer power amplifier.