Mach 1 Acoustics C-300 Service manual

C300

2-way passive loudspeaker

SERVICE MANUAL

2000 MACKIE DESIGNS, INC.

CONTENTS

Click on any item to open that page

Introduction...................................................................... 2

Overview........................................................................... 3

Specifications................................................................... 4

Schematics....................................................................... 5

Parts ................................................................................... 6

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.

2

Overview

The C300 has a Speakon® input, and
the C300i has a 1/4 inch phone jack.
Apart from this difference, all details in
this manual apply to both models.

The C300 is a portable two-way
loudspeaker system, capable of
extremely high sound pressure levels.

The Transducers

The C300 has a 12” high-power low­frequency woofer and a 1.75” mylar
diaphragm high-output compression
driver. The woofer incorporates
technology used in large-format
touring systems and has a precision 3­inch voice coil.

The high-frequency compression driver
is mounted on a multi-cell aperture
loaded on a constant directivity horn,
providing an ultra-wide, controlled
dispersion pattern and precise
reproduction of the critical upper mid­range and high-frequencies. The result
is an smooth off-axis response.

The Cabinet

The cabinet material is very strong and
is rigid enough to prevent unwanted
vibrations and standing waves in the
cabinet. It has built-in fly points for
hanging, and a socket in the bottom
for mounting on a tripod stand. The
asymmetrical trapezoidal design of the
cabinet also makes it easy to use as a
floor wedge for stage monitor
applications.

Inputs

The C300 input is a Speakon
connector, wired as follows:

Pin 1+ is Positive (+)
Pin 1– is Negative (–)
(Pins 2– and 2+ are not used)
The C300i input is 1/4” TS (tip-sleeve),

wired as follows:
The Tip is Positive (+)
The Sleeve is Negative (–)

Each driver has been specifically
designed for optimum performance in
a lightweight high-strength cabinet.

The Crossover

This unique Low Impedance
Compensated Crossover (LICC) design
places inductors in series with the
woofer whose values are markedly
lower than conventional designs. This
reduces the amount of energy that is
typically wasted as heat and increases
the amount of energy that is
transformed into real acoustic power. It
also incorporates dynamic protection
for the compression driver from non­linear signals.

3

SPECIFICATIONS

Low-Frequency Transducer

Diameter 300mm (12”)
Voice Coil Diameter 175mm (3”)
Sensitivity (
Nominal Impedance 8 ohms
Power Handling 300 watts
Frequency Range 50Hz – 3000Hz

High-Frequency Driver and Horn

Diaphragm Diameter 44.5mm (1.75²)
Exit Throat Diameter 24.5mm (1²)
Diaphragm Material Mylar
Sensitivity (
Nominal Impedance 8 ohms
Power Handling 150 watts
Frequency Range 1000Hz – 20,000Hz
Horn Type Composite: Exponential/

Mouth Size 304.8mm (12”) W x
Horizontal Coverage
Vertical Coverage

1W@1m) 98 dB

1W@1m) 106 dB

Conical

177.8mm (7”) H
90º ±10º (1kHz – 20kHz)
45º ±10º (2.8kHz – 20kHz)

Physical Properties

Height 66.0cm (25.98”)
Width 39.6cm (15.58”)
Depth 37.5cm (14.75”)
Weight 19.5kg (43lbs.)
Enclosure Geometry:

Asymmetrical Trapezoidal

Mounting Methods:
Integrated mounting points, 10mm, two each
located on each side, top, bottom, and rear of the
enclosure.

System Specifications

Input Type (C300i) 1/4-inch phone jack
Input Type (C300) Speakon®
Input Impedance 8 ohms
Max Input Power 300 watt
Enclosure Alignment Sixth-Order
Over-Excursion Protection

Second-Order
High-Pass Filter

Acoustic Frequency Response

45Hz – 20,000Hz
Low Freq–3 dB Point 55Hz
Maximum SPL @ 1m 126 dB
Low-Frequency Crossover Type

24 dB/octave, time offset

corrected
High-Frequency Crossover Type

24 dB/octave
Crossover Frequency 1800Hz
Driver Protection

Dynamic protection for

compression driver
Operating Temp Range –10ºC - 45ºC (14ºF -

113ºF)

stabilizing feet

1

Disclaimer

Since we are always striving to make our products
better by incorporating new and improved materi­als, components, and manufacturing methods, we
reserve the right to change these specifications at
any time without notice.

“Mackie” and the “Running Man” figure are
trademarks or registered trademarks of Mackie De­signs Inc.

All other brand names mentioned are trade­marks or registered trademarks of their respective
holders, and are hereby acknowledged.

©2000 Mackie Designs Inc.
All Rights Reserved.

2

3

4

+IN

L1

0.5mH

6.8 uF/100V

R1

C1

-IN

3x12 /20W

R2

R3

C2

L2

10 F/100V

+WF

0.32mH

-WF

R4

1.5 /20W

WF/8

+P

1 uF/100V

4.7 uF/100V

+TW

0.1mH

L3

C3

C4

3x18 /20W

R5

R6

R7

C300/MACKIE12P

0.2mH

L4

R8

10 /20W

FILTER. ELECTRIC DIAGRAM

-TW

TW/8

SE034414

AT THE FILTER

+P +IN -IN

C

1K/0.5W

R4

C

1000uF/16V

220/0.25W

+

2K2/0.25W

R2

1N4148

D5

R1

G=1

D=2

IRFP 140

S=3

560/0.25W
R3

ELECTRIC DIAGRAM FOR PROTECTION AND INPUT ASSEMBLY C300

DZ

12V

D1

+-

4XMUR 410

D2

3

+IN

+1

4

1

-1

-IN

J1

D3

D4

3

+IN

+1

4

1

-IN

-1

J2

C300/MACKIE12P

SE034530

EXTERNAL POWER

SUPPLY FOR
JACK AND SPEAK-ON
CONNECTORS

5

C300i PARTS LIST

RECONE KIT WOOFER C300 PART#: 11440005

13110051 MACKIE C300i

PART NO. DESCRIPTION QTY NOTES
SE034414 SCHEMATIC 1 SEE PAGE 5

SC034519 WIRING DIAGRAM 1 SEE PAGE 5
21110090 LOUDSPEAKER L12 1 WOOFER
23020530 PCB INPUTS-PROTECTION ASSY 34528-1 1 SEE PAGE 7
23030130 CROSSOVER 34412 1 SEE PAGE 7
23102840 SUPPORT DRIVER 1
23103060 CABLE W-TW ASSEMBLY 1
23103260 CABLE INPUTS ASSEMBLY 1
23103270 CABLE PROTECTION ASSEMBLY 1
23103690 ACCESSORIES BAG (FEET) 1
25110140 TWEETER N 350-MACKIE P 1 TWEETER
32910010 FIBER WASHER 12108 2
32910020 NYLON WASHER 11791 2
33090290 REAR CASE 33928 1
33090300 FRONT CASE 33929 1
33100180 REAR PANEL 35027 1
33160150 GASKET SUPPORT TW 33760 1
33160530 GASKET WOOFER 21202 1
33221370 GRILL WOOFER 34316 1
33890070 CABLE FASTENER 110 1
33890100 FOOT CABINET 34287 3
33900100 HANDLE 33931 2
33900110 TOP HANDLE 33937 1
33900120 INSIDE HANDLE 33939 2
33910170 KNOB 33934 1
33910250 SOUND ABSORBING STUFF 34373 1
33910260 WASHER FOR PCB 34599 4
33920240 SPACER FOR HANDLE 33832 4
33920300 NUT 33713 8
33920510 NUT 34202 2
33921480 INSERT 31832 10
33921580 SPACER 33359 8
33950530 NUMBER LABEL 50487 3
33951180 C300 LABEL 33932 1
33951360 MACKIE LABEL 34044 1
33951420 INSERT COVER 34236 10
33951570 MACKIE LABEL FOR INSERT 34410 1
33960750 OWNER’S MANUAL MOD.1715 1
33990640 INSIDE PACKAGING PROTECTION 34045 1
33990830 INSIDE PACKAGING PROTECTION 34262 1
33990840 BOX 34266 1
33990850 BTM PANEL FOR PALLET 34263 0.0555
33995370 CARD CORNER FOR BOX 33302 0.2222
33995470 TOP COVER FOR BOX 0.0555
43900140 GASKET 2.05
43900820 GASKET 1.2
51150311 SCREW+M4 X8 ZNN U7687 60951
51150532 SCREW+M6X20 INOX ZNN U7687 4
51170416 SCREW SC+M5X10 INOXZNN U7689 4
51190310 SCREW CEI M6 X16 ZNN U5931 4
51190336 SCREW CEI M6 X35 ZNN U5931 50762 8
51240407 SCREW C+ B 3,9X9,5ZNN U6954 8
51310523 SCREW+SL 4X20 ZNN 6175 3
51992002 SCREW+AB POLI 3,5X16 ZNN 6

6

PART NO. DESCRIPTION QTY
51992003 SCREW1/2C.B.+GS3 4,2X20 ZNN 4

51992004 SCREW 1/2C.B.+GS3 4,2X30 ZNN 6
51992007 SCREW C+GS3 4,8X50 ZNN 4
51992008 SCREW C+GS3 4,2X20 ZNN 9
51992010 SCREW 1/2C.B.+GS3 4,8X50 ZNN 2
51992012 SCREW 1/2C.B.+GS3 4,8X60 ZNN 15
52100101 WASHER 15X28 ZNC U6592 10
52100121 WASHER 6,4X12,5ZNNU6592 0174 12
52100133 WASHER 15X28 ZNN U6592 2
52301004 WASHER A 6,4 U1751 171 4
59023472 BAG 500+100+100X1200 34174 1
59999990 STRING CM 7 1
59999994 STRING T & B M 23 50152 1
83433027 C3C33-019M004- 4P MALE CONNECTOR 1

23020530 INPUT/PROTECTION PCB ASSEMBLY

PART NO. DESCRIPTION QTY NOTES
33030550 PCB C.S.MR 34528-1 1

33120380 HEATSINK 35023 1 FOR MOSFET
51150220 SCREW V.TC+M3 X10ZNC U7687 50149 1
52100103 WASHER 3.2X 6ZNC U6592 12272 1
81121029 C1R21-251J221-RES.STR. 1/4W5% 220 1 RESISTOR
81121034 C1R21-251J561-RES.STR. 1/4W5% 560 1 RESISTOR
81121041 C1R21-251J222-RES.STR. 1/4W5% 2.2K 1 RESISTOR
81121110 C1R21-501J102-RES.STR. 1/2W5% 1K 1 RESISTOR
81511039 C1E11-160*102-COND.EL. 16V1000 U 1 CAP. LYTIC 16V, 1000UF
82112001 C2D12-750*151-DIODE 1N4148 1 DIODE
82122015 C2D22-101*402-DIODE MUR410 4 DIODE
82131050 C2D31-501J120-ZENER 0.5W 12V 1 ZENER DIODE 12V
82262014 C2T62-313A101-MOSFET IRFP140 1 MOSFET IRFP140
83412015 C3C12-014F003- STEREO JACK 2
83434002 C3C34-002M003-FASTON 90 1
83811009 C3A11-009 -INSULATING STRIP 1

23030130 FILTER ASSEMBLY

PART NO. DESCRIPTION QTY NOTES
01821203 M6R21-003B -ADHESIVE 5

01881104 M6R81-004M -HARDENER 5
33030380 PCB C.S.MR 34412 1
33120370 HEATSINK FOR RESISTORS 35018 1
54100620 RIVET OU 35-50 SN 50269 1/2 2
59999992 SEAL T & B M 24 2
59999994 SEAL T & B M 23 50152 3
59999995 SEAL T & B M 25 2
81244156 C1F44-203J1R5-RES.FILO 20W5% 1.5 1 WIRE WOUND RESISTOR
81246013 C1F46-203J100-RES.FILO 20W5% 10 1 WIRE WOUND RESISTOR
81246014 C1F46-203J120-RES.FILO 20W5% 12 3 WIRE WOUND RESISTOR
81246016 C1F46-203J180-RES.FILO 20W5% 18 3 WIRE WOUND RESISTOR
81412019 C1C12-101K105-CAP.FILM100V10% 1U 1 CAP,FILM
81412023 C1C12-101K475-CAP.FILM100V10% 4.7U 1 CAP,FILM
81412024 C1C12-101K685-CAP.FILM100V10% 6.8U 1 CAP,FILM
81412025 C1C12-101K106-CAP.FILM100V10% 10U 1 CAP,FILM
81612045 C1L12-101B281-INDUCTOR 1 INDUCTOR
81632015 C1L32-501A281-INDUCTOR 1
81632017 C1L32-321A231-INDUCTOR 1
81632020 C1L32-201A181-INDUCTOR 1

7

NOTE: The C-300 speaker is the same as the C300i except for the following parts:

13112039 MACKIE C300

PART NO. DESCRIPTION QTY NOTES
23020520 PCB INPUTS-PROTECTION ASSY 335016 1

33100140 REAR PANEL 35016 1

NOTE: The C300 PCB INPUT BOARD (23020520) uses the SPEAKON connector, not the 1/4” stereo jacks like
the C300i.
The SPEAKON connector is part number:
83415001 C3C15-001F004-CONNECTOR 2

8