Mackie ART300A User manual

ART300A
Active Loudspeaker
Service Manual
2002 MACKIE DESIGNS, INC.

2
ART300A Service Manual
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY

3
ART300A Service Manual
CONTENTS
Safety Instructions...........................................................2
Introduction.....................................................................4
Active Speaker Safety Test............................................5
Overview..........................................................................7
Rear Panel ....................................................................... 8
Specifications..................................................................9
Parts ...............................................................................10
Final Assembly............................................................10
Amplifer Assembly.....................................................11
Amplifier PCB Assembly............................................12
Input Board Assembly and PCB...............................14
RCF Parts Differences................................................15
Main Circuit Board..........................................................16
Schematics
Crossover ..............................................................16
High Frequency Amplifier....................................17
Low Frequency Amplifier.....................................18
Power Supply........................................................19
PCB Layout.................................................................20
Input Board......................................................................21
Schematic..................................................................21
PCB Layout.................................................................22

4
ART300A Service Manual
Introduction
About this Manual
This manual contains the basic repair information for the ART series loudspeakers. For
each model, the following information is supplied:
• Safety information
• Overview
• Rear panel view and features
• Specifications and test details
• Parts list, containing a master parts list and sub-assembly parts
• Parts list differences between RCF and Mackie Industrial ART speakers
• Schematics
• PCB layout drawing
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.
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY
www.mackieindustrial.com
16220 Wood-Red Road NE, Woodinville, WA 98072 USA
TEL [phone], FAX [phone], [email protected]
UK +44.1268.571.212, FAX [phone] [email protected]
ITALY +39.0522.354.111, FAX [phone] [email protected]
FRANCE +33.3.8546.9160, FAX [phone] [email protected]
GERMANY +49.2572.96042.0, FAX [phone] [email protected]

5
ART300A Service Manual
You must perform the following leakage test before returning any active speakers 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 leakage current).
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 speaker before returning it to your customer.
Active speaker safety test

6
ART300A Service Manual
Safety First!
Before connecting and using the equipment, please read the Quick-Start Guide
carefully and keep it for future reference.
Warning
This equipment has been designed to be installed by qualified professionals only! There
are many factors to be considered when installing professional sound reinforcement
systems, including mechanical and electrical considerations, as well as acoustic
coverage and performance. Mackie Industrial strongly recommends that this equipment
be installed only by a professional sound installer or contractor.
1. Never install, connect, or disconnect the unit with the power supply on.
2. Before powering up the speaker, make sure the voltage select switch
corresponds to the AC Voltage supply.
3. Make sure the safety ground on the power cord is properly grounded.
4. To prevent the risk of electric shock, never open the unit. There are no user
serviceable parts inside.
5. To ensure normal cooling of the amplifier, make sure the unit is well ventilated.
Avoid exposure to direct sunlight or proximity to any heat source, dust, or
dampness.
Installation
A 1-3/8" (35mm) socket is provided in the bottom of the cabinet for mounting the
loudspeaker on a speaker stand.
The speaker can be suspended with approved rigging hardware. Always use at least two
M10 threaded inserts located on opposite sides of the enclosure. The speaker must be
positioned so that the weight of the enclosure is equally distributed over the two inserts.
Warning
Never attempt to suspend the ART Series loudspeakers by their handles. Consult a
professional rigger or structural engineer prior to suspending loudspeakers from a
structure not intended for that use. Always know the working load limit of the structure
supporting the loudspeaker array. Always make sure that the rigging hardware minimum
rating is at least five times the actual load.

7
ART300A Service Manual
Overview
The ART300A is a full-range two-way
professional active speaker system
that combines high power and wide
bandwidth in a light-weight enclosure
for fixed-installation systems. The
12" low-frequency transducer, in
combination with a 1" compression
driver coupled to an integral 90º x 70º
constant directivity polynomial horn,
form an extremely powerful package
for any small to medium-sized sound
reinforcement application.
It features a balanced XLR input with
a Mic/Line switch and a paralleled
balanced XLR output for cascading
multiple speakers. Rear panel
controls also include Music and Voice
equalization switches, a rotary volume
control, and an input limiter.
The two built-in power amplifiers
provide 300W for the LF driver and
60W for the HF driver. The enclosure
is constructed of high-strength
polypropylene, with M10 threaded
inserts on all four sides for rigging, and
an integral locking 1-3/8" socket in the
bottom for mounting on a standard
speaker stand.

8
ART300A Service Manual
Rear Panel
1. INPUT is a balanced XLR input jack that
accepts mic-level or line-level signals.
2. OUTPUT is a balanced XLR output jack in
parallel with the INPUT jack, allowing the
signal to “loop through” for daisy-chaining
speakers together.
3. LINE/MIC switch for mic-level or line-level
signals at the INPUT.
4. VOICE equalization switch ON provides a
gentle boost at 3kHz and 6kHz.
5. MUSIC equalization switch ON provides a
low-frequency and high-frequency boost.
6. LIMITER indicator illuminates when the limit-
ing protection circuits are activated.
7. OPERATE indicator illuminates when the
POWER switch is turned on.
8. VOLUME control adjusts the input-stage
gain.
9. POWER switch turns the AC power on and
off.
10. AC OUTLET for connecting AC power to
an additional Mackie Industrial active
speaker system.
11. Grounding Terminal provides an additional
safety grounding point.
12. IEC AC Socket. Connect the detachable
power cord to the socket. The protection
fuse is also contained in the AC socket.
CAUTION: Replace fuse only with the same
type as indicated on the rear panel.
Connections
The XLR connectors use the following AES
standard:
Pin 1 = Ground (Shield)
Pin 2 = Hot (+)
Pin 3 = Cold (–)
1
2
4
5
3
8
10 912 11
7
6

9
ART300A Service Manual
Specifications
System:
Freq. Range (–10 dB):
55Hz-19kHz
Freq. Response (±3 dB):
75Hz-16kHz
Horz. Coverage Angle (–6 dB):
90°, averaged 1kHz-10kHz
Vert. Coverage Angle (–6 dB):
70°, averaged 1kHz-10kHz
Directivity Factor Q (DI):
10.0 (10.0), averaged 1kHz-10kHz
System Sensitivity1:
101 dB, 1W@1m
Rated Maximum SPL2:
126 dB @ 1 m (3.3ft) peak
HF Protection:
Dynamic
Transducers:
Low Frequency:
12" (300 mm) diameter woofer
High Frequency:
1" (25 mm) compression driver, horn loaded
Preamp and Processor:
Input Sensitivity:
Mic In: 8mV
Line In: 125mV
Input Impedance:
Mic In: 650Ωunbalanced
1.3kΩbalanced
Line In: 10kΩunbalanced
19kΩbalanced
Crossover Frequency and Slope:
1.8kHz; 24 dB/octave
Time Alignment:
Analog, 0.3 ms HF delay
Speaker Protection:
Thermal, over-excursion
Music Equalization:
+4.3 dB @ 65Hz
+4.0 dB @ 12kHz
Voice Equalization:
+4.0 dB @ 3kHz
+4.0 dB @ 6kHz
Indicators:
Power ON, Limiter
Amplifiers:
LF Amplifier Power:
300 watts RMS
HF Amplifier Power:
60 watts RMS
Distortion:
< 0.1% THD at rated power
Amp Protection:
Thermal, limiter, short circuit
Power Supply:
115/230 VAC, 2A, 50/60 Hz
Physical:
Enclosure:
Asymmetrical trapezoidal, reinforced
polypropylene
Mounting:
Lockable 1-3/8" (35mm) stand mount
Rigging Inserts:
4 points, accepts M10 threaded hardware
Input/Output Connectors:
2 XLR balanced
Dimensions HxWxD:
24.4" x 15.4" x 12.3"
(620 mm x 390 mm x 312 mm)
Net Weight:
44.0 lb (20.0 kg)
Testing:
DC voltages:
+ 83 VDC
- 83 VDC
+ 41 VDC
- 41 VDC
+ 15 VDC
- 15 VDC
DC offset:
less than +/- 0.1 VDC
Bias:
At idle, into 8 ohm loads
after warm-up
adjust R36
5.5 mV R39-R40 (low freq amplifier)
adjust R73
13 mV R81-R82 (high freq amplifier)
AC current draw:
Less than 0.3 A at idle

10
ART300A Service Manual
ART300A Parts
13112024 ART300A Final Assembly
PART # DESCRIPTION QUANTITY NOTES
21111060 WOOFER L12.................................................................................................1
23103350 INPUT ASSEMBLY...........................................................................................1 See page 14
23103360 AMPLIFIER ASSEMBLY...................................................................................1 See next page
23103450 ACCESSORY (FLOOR WEDGE ANTI-TIP-OVER THINGY) ............................1
23103620 WIRE ASSEMBLY............................................................................................1
25110480 TWEETER N 350..............................................................................................1
33090090 CABINET FRONT 33526.................................................................................1
33090400 CABINET REAR 34288...................................................................................1
33160530 WOOFER GASKET 21202..............................................................................1
33221060 WOOFER GRILL 31809..................................................................................1
33221130 CONTROL BOARD SHIELD 32656 ................................................................1
33890100 FEET 34287.....................................................................................................4
33901250 HANDLE 31154..............................................................................................1
33901270 WIRE CABLE GROMMET 32498....................................................................1
33912130 ANTIVIBRATION 22867..................................................................................4
33912160 TRANSFORMER SPACERS 23128..................................................................6
33921210 NUTS FOR MOUNTING INSERTS 22839.........................................................4
33921480 MOUNTING INSERTS 31832 ..........................................................................4
33921510 GRILL SPACERS 32515..................................................................................4
33921540 TWEETER MOUNTING PLATES 32655............................................................2
33921580 SPACERS 33359 ............................................................................................8
33950280 MOUNTING INSERT COVER STICKERS (HEX) 23495....................................4
33951920 TRADEMARK BADGE 34672.........................................................................1
33960580 WARRANTY MOD.1712................................................................................1
33961560 INSTRUCTION GUIDE MOD.1743.................................................................1
33993020 SHIPPING BOX 34673....................................................................................1
33994990 BOX PACKING 31914...................................................................................2
33995000 BOX PACKING 31915...................................................................................2
33995350 SHIPPING PALLET 33301......................................................................0.0833
33995360 BOX COVER 33303..............................................................................0.1666
33995370 ANGLE 1800 33302..............................................................................0.3333
33995380 BOX PACKING 33368...................................................................................2
43040390 SOUND ABSORBER FOAM SP.15 DENS.50...............................................24
43900110 STOPPER PLUG..............................................................................................1
43900580 U-SHAPED RUBBER GASKET ESPACE200..............................................0.001
43900810 KNURLED KNOB 32243.................................................................................1
43900820 GASKET 32181............................................................................................1.2
43900830 GASKET 32266..........................................................................................2.05
51180425 Screw, Hex, white galv, M6 x 18 mm, U5739 3055 ...................................2
51190205 Screw, cylindrical, Allen, black galv, M5 x 10 mm, U5931......................4
51190336 Screw, cylindrical, Allen, black galv, M6 x 35, U5931 50762...................4
51240411 Screw, cylindrical, Phillips, pointed, black galv, 3.9 x 13 mm, U6954 ....4
51992008 Screw, cylindrical, Phillips, black galv, for plastic, 4.2 x 20 mm............20
51992010 Screw, roundhead, flange, Phillips, black galv, for plastic, 4.8 x 50 mm16
52100101 Washer, flat, 15 x 28 mm, white galv, U6592 ............................................4
52100121 Washer, flat, 6.4 x 12.5 mm, black galv, U6592 0174.............................10
52201009 Washer, crinkle, 6 mm DIN6798 50383 .....................................................2
52301004 Washer, split, 6.4 mm U1751 171 1/2..........................................................2
59024072 PLASTIC BAG 600+100+100X1200...............................................................1
83483019 LINECORD, USA, C3C83-012E003...............................................................1