Mackie SRS1500 User manual

SRS1500
Active Subwoofer
SERVICE MANUAL
2000 MACKIE DESIGNS, INC.
Go To Bulletins

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SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY

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CONTENTS
Introduction..................................................................... 3
Overview.......................................................................... 4
Specifications................................................................... 6
Safety test ........................................................................ 7
Parts................................................................................... 8
Service Bulletin ................................................................. 14
Fold-out Sections
Schematics and PCB layouts
Amplifier board .......................................................... 269-1
Input board ................................................................ 270-1
AC Input board ......................................................... 271-1
Assembly drawings .................................................... Assembly-1
INTRODUCTION
This manual contains basic service information. It is essential that you have a copy of the
user’s manual as this contains the complete operating instructions.
SERVICE TECHNICAL ASSISTANCE
MackieDesigns, Service TechnicalAssistance, isavailable 8AM- 5PMPST, Mondaythrough
Friday for Authorized Mackie Service Centers, at 1-800-258-6883. Feel free to call with any
questions and speak with a carefully-calibrated technician. If one is not available, leave
a detailed message and a qualified Mackoid will return your call asap.
DISCLAIMER
The information contained in this manual is proprietary to Mackie Designs, Inc. The entire
manual is protected under copyright and may not be reproduced by any means without
express written permission from Mackie Designs, Inc.
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY
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Overview
The SRS1500 is a high output active subwoofer system. It features a high-precision 15”
transducer combined with application specific amplifier technology. The system is
composed of a single, compact subwoofer cabinet with built-in control and amplifier
electronics.
The SRS1500 accepts a stereo line-level signal via female XLR input jacks. Male XLR Thru
jacks are provided for daisy-chaining the signal to additional SRS1500 cabinets. The built-
in crossover separates the low frequencies from the high frequencies, and routes the high
frequencies to the male XLR high-pass output jacks. Connect these to the inputs of full-
range active speakers such as the Mackie Designs SRM450s, or to an amplifier powering a
pair of passive speakers such as the Mackie Designs M•1400i and C300s. A Phase switch
gives you the option of reversing the phase to the full-range speakers by 180º. A
Subwoofer Level control allows you to adjust the balance between the subwoofer and
thefull-rangespeakers.
The built-in amplifier produces up to 600 watts of power. The amplifier module sits on a
large heatsink that eliminates the need for fans, dramatically extending life expectancy,
and eliminating maintenance cycles. A tremendous benefit of having the amplifier
located within the subwoofer cabinet is the speed with which power is delivered to the
woofer.
The cabinet is constructed with 18mm thick multi-layered birch plywood. Carrying
handles are integrated into each side for easy loading and transport.
POWER Switch
Use this switch to turn the SRS1500 on and off. Make sure the signal source’s level control
is turned down before you turn it on.
AC Receptacle
This is where you connect the AC linecord to provide AC power to the SRS1500’s built-in
power amplifiers. Plug the linecord into an AC socket properly configured for your
particular model.
THERMAL Indicator
The SRS1500 has a thermal protection circuit that monitors the internal temperature of the
amplifier and heatsink. If the temperature should exceed a safe operating level, the
signal is muted and the THERMAL indicator lights. When the temperature cools to a safe
level once again, the thermal protection circuit deactivates and normal operation
continues.
Note: Activation of the thermal protection circuit is an indication that you must take
steps to avoid continued thermal problems.
POWER Indicator
When the POWER switch is turned on and the linecord is connected to an active AC
power supply, this indicator lights green. The blue LED on the front of the cabinet works
in the same way.

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POWERTHERMAL
THRU
(FULL RANGE OUTPUT)
HIGH PASS
(MID/HIGH FREQ)
OUTPUT
SUBWOOFER
CONTROL
FULL RANGE
INPUT
PARALLEL
120Hz
ON
OFF
NORMAL
REV 180
PHASE
120 VAC 60HZ 350W
POWER
L
R
L
R
SUBWOOFER
LEVEL
(+4dBu )
NORMAL
+15
OO
IN OUT
FULL RANGE INPUT
These are female XLR-type connectors that accept a balanced line-level signal from a
mixing console or other signal source.They are wired per AES (Audio Engineering Society)
standards:
XLR
Hot (+) Pin 2
Cold (–) Pin 3
Shield(Ground)Pin1
THRU (FULL RANGE OUTPUT)
These are male XLR-type connectors that produce exactly the same signal that is
connected to the FULL RANGE INPUT jack. Use it to daisy-chain several SRS1500s together
off the same signal source.
HIGH PASS (MID/HIGH FREQ) OUTPUT
These are male XLR-type connectors that produce the frequencies above 120Hz. Connect
these to a pair of full-range active speakers or to an amplifer/passive speaker
combination.TheSRS1500 reproducesthe frequenciesbelow 120Hz.
SUBWOOFER LEVEL Control
This adjusts the subwoofer level. Use this control to balance the volume between the
subwoofer and the full-range speakers. The center detent position is +4 dBu gain, which is
the normal position. Unity gain is at the 9 o’clock position.
PHASEThis switch reverses the phase of the signal at the HIGH PASS OUTPUT jacks. Depending on
the placement of the SRS1500 subwoofer relative to the full-range speakers, you may get
a better low-frequency response in the room if you reverse the phase of the signal.

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Specifications
General Specifications
Freq.Range 40Hz–120Hz
Freq. Response 45Hz–120Hz (–3 dB)
Maximum SPL @1m 123 dB
PeakOutput@1m 126 dB
Crossover Freq. 120Hz (12 dB/octave)
Input Type
Balanced differential
InputImpedance 50kohms
Protection
Input Protection Level protected
Thermal Protection Input stage muting, auto-
reset
Transducer Specifications
Low-FrequencyTransducer
Diameter 15” (381mm)
Voice Coil Diameter 3.0” (75mm)
PowerHandling 350 watts rms
Power Amplifier
Low-Frequency Power Amplifier
Burst Capability 600 watts
RatedTHD <0.05%
Cooling Passive Heatsink
Line Input Power
US 120V, 60Hz
Europe 230V, 50Hz
Physical Properties
Height 23.25² (590mm)
Width 17.0² (432mm)
Depth 23.5² (597mm)
Weight 100 lbs. (45.4kg)
Enclosure 18mm thick multi-layered
baltic birch tree wood
Enclosure Geometry
Rectangular
Mounting Methods
Floor mount only

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You must perform the following leakage test before returning the unit to your customer.
Take every safety precaution to protect yourself while doing this test.
1. Make a small loading RC circuit as shown in the diagram below, and connect the AC
volt meter between the AC power source ground and any exposed metal on the unit
under test.
2. Connect the unit under test to an AC power source using a ground-lift adaptor, leaving
the unit’s safety ground floating. Turn the unit on.
3. The meter reading should be less than 750mVAC (note: this is equivalent to 0.5mA of
leakagecurrent).
4. Flip the plug over in the receptical so the hot and neutral are swapped.
Verify that the reading is still less then 750mVAC.
5. If either reading is greater than 750mVAC, then you must investigate and repair the unit
before returning it to your customer.
Safety test

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MASTER PARTS LIST
090-104-00 SRS1500 120V MODEL
PARTNUMBER DESCRIPTION REV QPA NOTES
055-313-00 PCB ASSY LED SRS1500 A 1
092-903-00 LC IEC SJT 1250W 10A/125V A 1 LINECORD 120VAC
080-101-00 SA AMP A 1 AMPLIFIER SUBASSEMBLY
490-022-00 WOOFER 15IN SPKR A 1
490-045-00 CABINET HOUSING SRS-1500 A 1
490-051-00 POLE MOUNT CUP SRS1500 A 1
550-476-00 HANDLE HOUSING SPKR A 2
550-529-00 FAB BRKT POLE SRS1500 A 1
550-530-00 FAB BRKT HANDLE SRS1500 B 4
551-507-00 CAST HANDLE SPKR A 2
700-035-04 TF 6-32X3/8 PHP CLRZC A 4 SCREWS
700-038-00 MCH 10-32X1-1/4 SS SKTCAP A 8 SCREWS
700-051-10 MCH 8-32X7/8 PHP BLKZC A 8 SCREWS
700-130-15 MCH 10-32X1 1/2 BTNSK BLK A 10 SCREWS
700-131-00 10-32X1.25 FL 82D HEX BLK A 8 SCREWS
701-022-00 #4X1/4 PHP II TYP B BLK B 1 SCREWS
701-025-00 WOOD #10 X 3/4 PHP BLK A 12 WOOD SCREWS
701-030-00 WOOD #6X1/2 RND HD PH BLK A 12 WOOD SCREWS
705-021-01 NUT PALNUT 7/16OD STLZC A 2 AHH NUTS!
710-057-00 WASH FLT ID .195 SS BLK A 10 WASHER
760-115-00 SIDE HANDLE GRIP SRM450 A 2
760-142-00 PORT SUB WOOFER SRS1500 A 2
790-002-00 BAG POLY 12 X 18 2MIL A 1
790-019-00 P/FOAM 48X28X1/32 P/F SHT A 0.01
800-144-00 BOX SRS1500 A 1
800-162-00 BOX BOTTOM TRAY SRS1500 A 1
810-100-00 INSERT TOP/BTM SRS1500 A 2
810-101-00 INSERT CRN RAILS SRS1500 A 4
820-187-00 OWNERS MANUAL SRS1500 A 1
840-227-00 LOGO MACKIE LDSKR SERIES D 1
840-273-00 LOGO SRS1500 ACTIVE C 1
SRS1500 PARTS LIST
PART# DESCRIPTION PAGE
090-104-00 SRS1500 MASTER PARTS 8
080-101-00 AMPLIFIER SUBASSEMBLY 9
055-269-00 PCB ASSY AMP SRS1500 11
055-270-00 PCB ASSY INPUT SRS1500 12
055-271-00 PCB ASSY AC INPUT SRS1500 13
RECONE KIT L15P530-SRS: PART # 11467001

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080-101-00 AMPLIFIER SUBASSEMBLY
PARTNUMBER DESCRIPTION REV QPA
040-406-00 DIS 16GA WHT 4.5 IN QDX2 A 2
040-407-00 DIS 16GA BLK 4.5 IN QDX2 A 2
040-408-00 CBL ASY 2P 22G 45IN SPOX B 1
055-269-00 PCB ASSY AMP SRS1500 A 1 SEE PAGE 10
055-270-00 PCB ASSY INPUT SRS1500 A1 1 SEE PAGE 12
055-271-00 PCB ASSY AC INPUT SRS1500 A 1 SEE PAGE 13
080-155-00 SA XFMR SRS1500 W/FERRITE A 1 TRANSFORMER SUBASSEMBLY
080-184-00 SA 040-409-00/601-039-00 A 1
080-185-00 SA 040-404/405/601-040-00 A 1
410-018-00 SILPAD 4 C SRS1500 4.46” C 1
410-019-00 SILPAD 6C SRS1500 6.56” C 1
410-020-00 SILPAD DIGI SRS1500 5.02” A 1
410-022-00 MICA 1.08x.90x.002 SRS150 A 2
410-023-00 MICA .90x.70x.002 SRS1500 A 2
500-055-00 SW PWR RCKR QD SRS1500 A 1 POWER SWITCH
550-249-00 PLATE XFMR .335IDX4.528OD A 1
550-477-00 SCR PANEL REAR SRS-1500 A 1
550-492-00 PNT SUPP AMP SRS1500 A 2
550-493-00 FAB SUB HTSINK SRS1500 A 1
550-509-00 FAB SUB HTSK LFT SRS1500 A 1
550-510-00 FAB SUB HTSK RGT SRS1500 A 1
550-513-00 GEORGES SPRING CLIP SRS A 7
550-569-00 PLATE XFMER SRS1500 A 1
700-028-00 SEMS 6-32X1/4 PHP BLKZC B 8
700-028-03 SEMS 6-32X1/2 PHP BLKZC A 4
700-055-00 MCH 4-24X3/8 PHP BLK HILO A 12
700-113-01 BOLT CAR 5/16-18 2.5I STL A 1 TRANSFORMERCARRIAGEBOLT
705-001-00 KEPNUT 6-32 A 19
705-008-00 NUT LOCK 8-32 A 4
705-011-00 NUT LOCK 10-32 A 4
705-018-00 NUT HEX 5/16-18 (GD-5) A 1 TRANSFORMER MOUNTINIG NUT
706-080-00 MOUNT VIBRATION 1.0 DIA A 4
706-084-00 STDF 1/4 HEX 6-32 .187 FF A 7
710-017-00 WASH SPLTLCK 5/16 HEAVY A 1
710-024-00 WASH FLAT 5/16 HARD (USS) A 1
710-054-00 WASH FLT .312 OD A 7
710-056-00 WASH SHLD #6 .36 OD NYLON A 2
712-061-00 NO4 VINYL COAT WIRE CLAMP A 1
720-006-00 TAPE DS 60M .50W VYNL BLK A AR
730-001-00 THERMALJOINTCOMPOUND A AR
730-025-00 LOCTITE 222 A AR
730-026-00 ADHESIVE RTV162 A AR
740-001-00 TYRAP 3-1/4L A 2
740-002-00 TYRAP MOUNT .75 X .75 B 1
760-081-00 KNOB TRIM W/PNTR A 1
780-111-00 WASH RUB (W/TRANSFORMER) A 2
780-150-00 SHIELD AMP PCB SRS1500 A 1
790-001-00 BAG POLY 20 X 30 4MIL A 1
800-166-00 BOX SET SA AMP SRS1500 0.25

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AMP PCB ASSEMBLY 055-269-00 REV:A
PARTNUMBER DESCRIPTION VALUE REFERENCEDESIGNATORS
110-001-00 RES CF .25W 5% 10 OHM 10 5% R1 R3 R43 R45 R65 R68
110-018-00 RES CF .25W 5% 51 OHM 51 5% R26 R38
110-025-00 RES CF .25W 5% 100 OHM 100 5% R50 R59
110-033-00 RES CF .25W 5% 220 OHM 220 5% R47 R64
110-039-00 RES CF .25W 5% 390 OHM 390R R57 R74
110-041-00 RES CF .25W 5% 470 OHM 470 5% R29 R35
110-049-00 RES CF .25W 5% 1K OHM 1K 5% R25 R37 R48-49 R54-55 R60-61 R71-72
110-051-00 RES CF .25W 5% 1K2 OHM 1k2 R51 R56 R58
110-057-00 RES CF .25W 5% 2K2 OHM 2K2 R6 R12-15 R19 R27 R39 R46 R66 R73 R76
110-080-00 RES CF .25W 5% 20K OHM 20K 5% R70 R77
110-083-00 RES CF .25W 5% 27K OHM 27K 5% R75
120-025-00 RES MO .5W 5% 1 OHM 1R R17 R24
120-064-00 RES MO .5W 5% 43 OHM 43 5% R34
120-081-00 RES MO .5W 5% 2K2 OHM 2K2 5% R30 R33
120-090-00 RES MO .5W 5% 5.1K OHM 5.1K 5% R16 R18 R20 R23 R28 R40
121-025-00 RES MO 1W 5% 1 OHM 1R R7-8 R22 R41
121-085-00 RES MO 1W 5% 3K3 OHM 3k3 R44 R67
123-033-00 RES MO 3W 5% 2.2 OHM 2.2 5% R5 R10-11
125-034-00 RES WW 5W 0.15 OHM 0.15R R9 R21 R31 R36
125-035-00 RES WW 5W 5% 1k OHM 1k R32 R42 R52-53 R62-63
125-036-00 RES WW 5W 5% 1K5 OHM 1k5 R4
125-037-00 RES WW 5W 5% 2K2 OHM 2k2 R2
125-038-00 RES WW 5W 5% 470 OHM 470 R69 R78
200-007-02 PLY .01UF 10% 100V TR 0.01 C28-29
200-036-02 PLY/BX .1UF 10% 250V TR .1uF 10% C10 C15 C30
200-042-02 PLY/BX .22UF 10%250V TR 0.22 10% C4 C7 C20 C22-24 C32-38
200-049-00 PLY BOX LW IND 22UF SPL 22UF C5-6
200-062-00 PLY FILM 6.8UF 10% 100V 6.8UF C1-2 C14
205-006-02 MICA 30PF 5% 500V T/A 30pF 5% C31
220-007-00 LYT 100UF 20% 100V RAD 100UF 10% C17-18
220-011-02 LYT 100UF 20% 25V RAD 100UF 10% C3 C8 C16 C19 C26-27
220-016-00 LYT 1000UF 20% 25V RAD 1000UF 10% C12-13
220-027-02 LYT 10UF 20% 50V RAD TR 10UF 10% C21 C25
220-033-00 LYT 10000UF 20% 80V RAD 10,000uF20% C9 C11
NOT USED C39-40
300-007-00 DIO SW 1SS244-SUB 1SS245 1SS244 D13 D15 D17 D19 D22-23 D25 D28 D30
D35 D37-40
301-019-00 DIO PWR BRDG 25A 400V SIP 25A D10
301-059-00 FAST DIO 600V/4A MUR460 MUR460 D6-7 D18 D20
301-060-00 FAST DIO 400V/1A MUR140 MUR140 D11 D16
301-061-00 FAST DIO 400V/15A MUR1540 MUR1540 D2-3
301-062-00 DIO BRDG 400V/1A DF04M DF04M D9
302-002-00 DIO ZEN 1N5230B 4.7V 1N5230 D29 D31
302-026-00 DIO ZEN 1N4744A 15V 1W 1N4744 D1 D4-5 D8 D27 D33
302-030-00 DIO ZEN 1N4746A 18V 1W 1N4746 D21 D34
304-041-02 LED GRN T-1 TRANS W/TIE GRN D12 D14 D24 D26 D32 D36
310-001-02 TRANSISTOR NPN 2N3904 2N3904 Q7 Q12
310-018-00 XSTR NPN TIP122 TIP122 Q4
310-023-02 XSTR NPN 2SC2362K TR 2SC2362K Q20-23 Q25
310-032-02 TRANSISTOR PNP T&R 2SA1016K Q18-19 Q28-30
310-035-00 TRANSISTOR PNP 2SA1478 Q24 Q26-27
310-036-00 TRANSISTOR NPN 2SC3788 Q15-17
310-042-00 XSTR NPN MJE15032 MJE15032 Q14
310-043-00 XSTR PNP MJE15033 MJE15033 Q10
310-062-00 XSTR NPN 100V/25A TIP35C TIP35C Q8 Q13