Infinity Overture 2 User manual

Compositions Series
Overture 2
Powered Loudspeakers
Service Manual
Infinity Systems, Inc
250 Crossways Park Dr.
Woodbury, New York 797
Rev1 5/2004

TABLE OF CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . ……. . . . .3
DETAILED SPECIFICATIONS . . . . . . . . . . . . . .. . . . . . . . . . …… . . . . .4
WIRING THE SYSTEM . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . …….. . . . .5
OPERATING THE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . ……. . . . .6
REPLACING THE FUSE . . . . . . . . . . . .. . . . . . . . . . .. . . . . . . . ……. . . .7
CARE OF YOUR SPEAKER SYSTEM/TROUBLESHOOTING . ….…. .10
MECHANICAL/PACKAGING PARTS LIST . . . ……….……………... . . .11
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . …………... . . . . . . .12
PACKAGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ……. . . . . . . . . .13
SERVICE BULLETIN INF9704 NOV. 1997 …………………………….....14
SERVICE BULLETIN INF9705 NOV. 1997 . . .. . . . . …………. . . . . . . .16
TEST SET UP AND PROCEDURE . . . . . . . . .........................................17
NOTE ON OVTR 2/3 AMPLIFIER REVISION……………………………..18
PCB DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . ……... . . . . . . . . . . . .19
ELECTRICAL PARTS LIST (120V) . . . . . .. . . . . . . …………………. . . .21
ELECTRICAL PARTS LIST (230V) . . . . . . . . . . . . . . . . …... . . . . . . . . .24
INTEGRATED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . ……. . . . . . . . . .27
WIRING DIAGRAM/CROSSOVER NETWORK SCHEMATIC (120V) . . .28
WIRING DIAGRAM/CROSSOVER NETWORK SCHEMATIC (230V) . . .29
120V SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . … . . . .30
230V SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . .. . . . …….. . . . . . . . .33
Infinity continually strives to update and improve existing products, as well as create new ones. The
specifications and construction details in this and related Infinity publications are therefore subject to
change without notice.
Overture 2
2

Overture 2
3
Specifications
Frequency Response: 30Hz - 20,000Hz (±3dB)
Recommended Amplifier Power Range 10-150 watts
Amplifier Peak Output: 300VA
Maximum Output: 112 dB SPL
Sensitivity: 93dB 2.83V @ 1 meter
Nominal Impedance: 8Ω
Crossover Frequencies: 350 and 3,000Hz
Low-Frequency Driver: (2) 6 1/2” (165MM) high-efficiency,
dynamically-balanced, magnetically
shielded woofers.
Mid-Bass Driver: (2) 5 1/4” (125mm) high-efficiency,
magnetically shielded midrange drivers
High-Frequency Driver: 1” (25mm) soft dome, high-efficiency,
neodymium magnet, magnetically
shielded tweeter
Dimensions (H x W x D): 38-3/4” x 6-7/8" x 15-3/4"
(984mm x 175mm x 400mm)
Weight: 47 lb./(21.4 kg) Each
Power Consumption: 150 watts (Maximum)
* The maximum recommended amplifier power rating will ensure proper system headroom to allow
for occasional peaks. We do not recommend sustained operation at these maximum power levels.

Detailed Specifications
Overture 2
4

Overture 2
5
Wiring The System

Overture 2
6
Operating The System

Overture 2
7
Replacing The F se

Overture 2
8
Replacing The F se (Cont.)

Overture 2
9
Replacing The F se (Cont.)
UTILSER UN FUSIBLE DE
RECHANGE DE MEME TYPE ET
CALIBRE
FOR CONTINUED PROTECTION AGAINST
RISK OF FIRE,REPLACE ONLY WITH SAME
TYPE OF FUSE: T1.6A 250V
CAUTION: ATTENTION:
POWER FUSE
T 1.6A 250V ~ 230V 50Hz 150W MAX
00435
F
U
S
E
F
U
S
E
FUSE T3, 1.6A
250V
OVTR 2 & 3 FUSE

Overture 2
0
Care of Yo r Speaker System/Tro bleshooting

Overture 2
Mechanical/Packaging Parts List
1 CABINET NOT FOR SALE
2 6.5”, WOOFER, B160-4 (120V) DCR = 14.2Ω±10% 2 330618-001
6.5”, WOOFER, LM-B160-8 (230V) DCR = 40Ω±10% 2 333773-001
3 SCREW, #8 x .75”, PPH, ZINC 17 900102-012
4 REAR WOOFER GRILLE 1 330955-001
5 FRONT/REAR WOOFER BAFFLE 2 332334-001
6 AMPLIFIER CAP 1 331399-001
7 CROSSOVER NETWORK (120V) 1 331235-001
8 BASE, FRONT FOOT 1 331184-001
9 REAR BASE 1 331075-002
10 REAR BASE w/PORT 1 331236-001
11 BINDING POST (RED) 1 331723-001
12 BINDING POST (BLACK) 1 331724-001
13 SCREW, #8 x 1” PPH, ZINC 15 900102-016
14 SCREW, #6-32 x 3/8” PPHMS CADCAD PLATED 2 10811
15 AMPLIFIER 1 NOT FOR SALE
16 1” (25MM) NEODYMIUM TWEETER DCR = 3.6Ω±10% 1 333232-001
17 UPPER FRONT BAFFLE (120V) 1 331182-001
UPPER FRONT BAFFLE (230V) 1 332335-002
18 FRONT GRILLE 1 333585-001
19 SCREW, #6 x 3/4” PPHD, BLK 12 63563
20 SCREW, 4-40 x .25” PPH, ZINC 2 905502-004
21 5.25”,MIDRANGE TRANSDUCER, B125-6 DCR = 7.7Ω±10% 2 330650-001
22 MIDRANGE CUP (120V) 1 330833-001
PACKAGING
23 SPIKE FOOT SET, 1.5” 1 331360-001
24 OUTER CARTON (120V) 1 331245-001
25 FOAM PAD, TOP 1 331254-001
26 FOAM PAD, BOTTOM 1 331255-001
27 SURVEY CARD 1 330033-001
28 OWNER’S MANUAL (120V) 1 332292-001
29 SAFETY SHEET 1 330100-001
30 LINE FUSE 5A 2AG SLO-BLO (120V) 2 FS1068 or 331925-001
Ref No. Description Qty Part No.

Overture 2
2
Exploded View
1
23
5
19
7
8
10
13
13
14
15
3
5
16
17
18
19
20
3
21
22
00413
4
11
12
9
2
6
19

Overture 2
3
Packaging

Overture 2
4

Overture 2
5

Overture 2
6

Overture 2
7
Test Set Up and Proced re
SIGNAL
GENERATOR
AMPLIFIER
AC VOLT
METER (10V) OVERTURE 2
UNDER TEST
SPEAKER
OUTPUT
FROM
AMPLIFIER
00421
SYSTEM AURAL SWEEP TEST
Equipment needed:
•Function/signal generator/sweep generator
•High Gain Integrated Amplifier
•Multimeter
•Speaker cables
General Unit Function (UUT = Unit Under Test)
1. From the signal generator, connect a mono cable to the Integrated amplifier; with speaker cables connect the
amplifier’s output to the UUT Speaker binding posts.
2. On the UUT, turn the BASS (level) control full counterclockwise (1).
3. Turn on generator, adjust so that the output at the Integrated amplifier is 1.0V, 30 Hz.
4. Plug in UUT; LED should be Red. Turn BASS (level) control full clockwise (9).
5. LED should now be Green and immediate bass response should be heard (and observed if the grille is removed).
Sweep Function
6. Follow steps 1-5 above.
7. Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other
noises. If any unusual noises are heard, remove woofers and test.
Driver Function
8. Remove woofer from cabinet; detach + and - wire clips.
9. Check DC resistance of woofer; it should be:
(120v) - 14.1 Ohms ±10%
(230v) - 40.0 Ohms ±10%
10. Connect a pair of speaker cables to driver terminals. Cables should be connected to a high-gain integrated
amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 20.0V. *
11. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
* Only the 120v version will be driven to near maximum excursion at this voltage; because of the unusually high DCR of the voice
coil, driving the 230v version at twice this voltage is not practical with simple test equipment and 20v should suffice for test
purposes.
Amplifier bias adjustment
1) Power up loudspeaker and drive at low levels for 3 minutes for warm-up.
2) Remove amplifier assembly (disassembly procedure in bulletin INF9704 Page 15).
3) Power up on the bench; attach DMM (on low DC voltage range) across TP1 and TP2 on schematic – R77 - (120v)
.22 Ω5W fuse resistor. (230v) .47 Ω5W fuse resistor. Mini-grabbers can be used on the resistor leads without PCB
removal.
4) Adjust POT2 (bias pot on PCB) to read 5.9 mV for both 120v and 230v units.

IMPORTANT NOTE ON OVTR 2/3 AMPLIFIER REVISION
There was an early version of the Overture 2 and 3 Amplifier that is represented slightly inaccurately in the schematic, PCB drawings, and parts list
in this service manual. This page is a guide to the identification and differences to this earlier version. The drawing below is a later version of the
PCB, complete with this information. NLA = No Longer Available
ORIGINAL VERSION = R80 IS NOT IN
SILKSCREENED AREA, BUT INSTEAD ON
OPPOSITE SIDE OF PCB, CONNECTED
FROM MAIN “+” ON C15, TO COLLECTOR
(CENTER LEAD) ON Q12 (BF469).
Q11 ORIGINAL VERSION = MPSU06
Q11 LATER VERSION = 2SD2012
(DO NOT SUBSTITUTE - PIN LAYOUT
DIFFERENT !)
MPSU06 part# NLA
ORIGINAL VERSION = TWO RELAYS
LATER VERSION = ONE RELAY
Do not mistake T1 for a relay.
(Later version has speaker output terminals in footprint of former relay)
There was also a version with two relays that had the output terminals on
the indicted relay bypassed with buss wire, rendering it inoperative.
ORIGINAL RELAY part# NLA
R43,43b ORIGINAL VERSION = 13K Ω1/2
W
R43,43b LATER VERSION = 33K Ω1/2W
13K Ω1/2W part# NLA
Overture 2
18

Bass Amplifier PCB, Padmaster & Solder Side
Overture 2
19

Bass Amplifier PCB Component Side Silkscreen
Overture 2
20