Infinity Infinity Modulus Manuale utente

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

Modulus

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%

Modulus

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:

Modulus

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

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.

Modulus

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

Modulus

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