Infinity Infinity Modulus User manual

MODULUS
Servo Controlled Subwoofer
Electronic Control Unit
SERVICE MANUAL
Infinity Systems Incorporated
250 Crossways Park Dr.
Woodbury, New York 11797 Rev35/2005

TABLE OF CONTENTS
Basic Specifications ………………………………….………………….2
Controls/Set-up …………………………….…….…………….………….3
Operation ………………………………….….…………………………..6
Detailed Description of ECU…………………….…….….……………..7
Troubleshooting the System................................……………………..9
Tech Tip….…………………………………...………………………….10
Removal/Installation of Amplifier…..…………….……….……………12
Modulus Exploded View…………………….…….….…….…………..13
Amplifier Adjustment…………………………………………………….14
Burnt PCB Repair Instructions…..…………….……….………………15
Input Plate Schematic………………………..…………………………16
Control Woofer Wiring………………………………………………..…17
ECU Transformer……………………………………………………..…18
Main Power Transformer………………………………………………..19
Din Cable Pinout…………………………………………………………20
Mechanical Parts List……………………………………………………22
Electrical Parts List ………………..…………………………………….23
Schematics…………………………………...…………………………..26
Package………………………………………………………….……….28
NOTICE
THE FOLLOWING PARTS ARE NO LONGER AVAILABLE FROM
INFINITY SYSTEMS:
COMPLETE SUBWOOFERS
COMPLETE AMP ASSEMBLIES
COMPLETE ELECTRONIC CONTROL UNITS (ECU)
SUBWOOFER POWER TRANSFORMERS
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MODULUS SUBWOOFER SPECIFICATIONS
Frequency Response: 22 - 200 Hz
Crossover Frequency:
High Pass: 22Hz and 35 Hz, 12 dB per octave
Low Pass: 50 - 200 Hz (Continuously Variable, 12dB per octave)
Output Power: 250 Watts (RMS)
Driver: 12" IMG Woofer w/ accelerometer - (2 Ohm DCR)
Inputs (to ECU): Line Level (from Electronic Control Unit)
Outputs (from ECU): 6 dB per octave passive filter for satellite amplifier
Servo Control System Motional feedback, accelerometer controlled
Dimensions: 19 17 ½ X 17 12" (H x W x D)
(483 x 444 x 444mm)
MODULUS ECU SPECIFICATIONS
CONTROL PARAMETERS:
Crossover: Full CW
Phase: 0 degrees
Level: Full CW
Switch: 22 Hz
BOTH CHANNELS DRIVEN UNLESS OTHERWISE SPECIFIED
Max Vin: 5.0 volts (One channel)
8.0 volts (Both channels)
Note: Higher input voltages can be achieved with lower "level" control (knob) levels
Max Vout: 5.0 volts (One channel driven)
8.0 volts (Both channels driven)
Gain @ 70 Hz: 0 dB (none)
Input Sens.: 500µV — 8.0 volts
Zinput: 70KW
Zoutput: 260W
S/N Ratio: —124 dB
THD+N
20 Hz — 200 Hz: less than .002%
200 — 800 Hz: less than .01%
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DESCRIPTION OF MODULUS ECU (Electronic Control Unit)
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 Dual In-line Package 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. The higher the
impedance is, the more range you will have. (A typical input impedance is 47kW.)
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:
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1. A lower amplifier input impedance will result in a higher crossover point at a given switch
position.
2. As the switch positions progress, (options 1 - 10) they result in a higher crossover point.
OPTION
#
INPUT
IMPEDANCE
RANGE (OHMS)
SWITCH
6
SWITCH
5
SWITCH
4
SWITCH
3
SWITCH
2
SWITCH
1
SHUNT
RESISTOR
*
1 8 -12K DOWN DOWN UP DOWN DOWN DOWN -
2 12 -18K UP UP DOWN DOWN DOWN DOWN -
3 16 - 24K UP UP DOWN UP DOWN DOWN -
4 26 - 40K UP UP DOWN UP UP DOWN -
5 40 - 60K UP UP UP UP UP DOWN -
6 70 - 80K UP UP UP UP UP DOWN 200K
7 80 - 120K UP UP DOWN UP UP UP -
8 120 - 200K UP UP UP UP UP DOWN 68K
9 200 - 500K UP UP UP UP UP DOWN 56K
10 500K - 1MEG UP UP UP UP UP DOWN 51K
* The "shunt resistor" mentioned in the latter options is a ¼ watt resistor soldered across an RCA male plug (2
required). These are plugged into the adjacent high pass output jacks you will be using (internally in parallel).
The purpose is to present a lower input impedance to the ECU filter for more optional settings. If you are
unable to assemble these or have no access to the correct parts call Infinity Systems.
EXAMPLE #1: We have an amplifier with an impedance of 20k, but we want a higher crossover point than 140
Hz.
SOLUTION: Try switch options 4 or 5.
EXAMPLE #2: We have an amplifier with an impedance of 75k, but we want a lower crossover point than 140
Hz.
SOLUTION: Try switch options 1,2,3, or 4.
IV KNOB RECOMMENDATIONS:
Again, if using the high pass filter only on the ECU: all knob positions are irrelevant (including power) as the filter
section is a separate, passive section.
If you are using a powered subwoofer of some type other than the Infinity subwoofer designed for this system, we
recommend using either one set of controls or the other; It would be redundant to manipulate both sets of controls. If
you are going to use the controls on your subwoofer, set the "Crossover" and "Level" knob to the ECU on full CW
(clockwise); set the "Phase" knob on "0" (full CCW); set the "22/35" Hz switch on 22 Hz. Then use the frequency and
gain controls on your subwoofer only. If you are going to use the ECU controls only, set the "Crossover" knob on the
subwoofer at full CW and start with the "Level" control at 12 O'clock (half-way). If more gain is needed (after turning
the ECU gain up during testing) then the level pot can be turned up further. Then use the frequency and gain controls
on your ECU only.
If you have a powered subwoofer of some other brand that does not have a gain or frequency control, use the
controls on the ECU with discretion.
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TROUBLESHOOTING THE MODULUS SUBWOOFER SYSTEM (IF999912 B/W)
I BLOWS LINE FUSE IN CABINET IMMEDIATELY
Usually: Short in toroidal transformer (power supply)
Could be: Short in amplifier
Could be: Voltage selector switch in wrong position
II BLOWS LINE FUSE IN CABINET AFTER SHORT PERIOD OF TIME, PLAYING MUSIC
Usually: Defective amplifier
III BLOWS LINE FUSE IN ECU
Usually: Defective ECU
Could be: Voltage selector switch in wrong position
IV BOTH LED's DO NOT LIGHT ON ECU
Usually: Defective ECU
Could be: Blown ECU line fuse or defective power cord
Could be: Lacking AC power source to line cord
Could be: Voltage selector switch in wrong position
V POWER LED (RED) O.K.; GREEN LED DOES NOT LIGHT ON ECU
Must be: Defective ECU
VI ALL LED's NORMAL, (cabinet LED goes off after delay) BUT NO OUTPUT
Usually: Defective amplifier
Could be: Defective ECU
Could be: Defective control cable
VII FRONT CABINET LED DOES NOT LIGHT (with ECU off or disconnected)
Usually: Defective amplifier
Could be: Defective toroidal transformer (power supply)
Could be: Blown line fuse
VIII FRONT CABINET LED DOES NOT GO OFF WITH ECU ACTIVE, AFTER DELAY (and no output)
Could be: Defective ECU
Could be: Defective amplifier
Could be: Defective control cable
IX BOTH CABINET LED's (front and power supply) DO NOT LIGHT (and no output)
Usually: Lacking AC power source to line cord
Could be: Voltage selector switch in wrong position
X VERY LOW OUTPUT (with ECU gain full clockwise)
Usually: Defective amplifier
Could be: Defective ECU
Could be: Defective control cable
Could be: Volume control on receiver turned down
XI WOOFER SQUEAL/OSCILLATION, "BREATHING", "THUMPING", OR EXCESSIVE EXCURSION
Usually: Defective control woofer
Could be: Defective amplifier
Could be: Defective ECU
Could be: Defective control cable
XII HUM FROM WOOFER WHEN ACTIVE
Could be: Defective amplifier
Could be: Defective ECU
Could be: Defective control cable
Could be: Defective (customer) signal input cable to ECU
Could be: Ground loop problem requiring 3 to 2 prong "cheater" plug on power cord
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