Mach 1 Acoustics SRS-1500 Service manual
SRS1500
Go To Bulletins
Active Subwoofer
SERVICE MANUAL
2000 MACKIE DESIGNS, INC.
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY
2
CONTENTS
Click on any item to open that page
ALL BOARDS
Introduction..................................................................... 3
Overview.......................................................................... 4
Specifications................................................................... 6
Safety test ........................................................................ 7
Parts................................................................................... 8
Service Bulletin ................................................................. 1 4
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
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY
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
Mackie Designs, Service Technical Assistance, is available 8AM - 5PM PST, Monday through
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.
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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 builtin 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 fullrange 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
the full-range speakers.
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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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)Pin 1
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. The SRS1500 reproduces the frequencies below 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.
PHASE
This 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.
POWER
ON
OFF
120 VAC 60HZ 350W
PARALLEL
THRU
(FULL RANGE OUTPUT)
POWERTHERMAL
L
R
SUBWOOFER
CONTROL
NORMAL
(+4dBu )
OO
+15
SUBWOOFER
LEVEL
NORMAL
REV 180
PHASE
FULL RANGE
INPUT
IN OUT
HIGH PASS
(MID/HIGH FREQ)
OUTPUT
120Hz
L
R
5
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