Mk III SERIES
PROFESSIONAL
LOUDSPEAKER
ENCLOSURES
Reference / Owner’s Manual
for 1211 Mk III / 1225 Mk III
/ 1226 Mk III
P/N 053566 REV C
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MK III
PROFESSIONAL LOUDSPEAKER
SYSTEMS
INTRODUCTION
Thank you for purchasing a Mk III Series Loudspeaker
System from Fender® Pro Audio. We are sure you
will find it both a unique and effective sound
reinforcement product, providing years of trouble-
free service day in and day out.
All Wood Construction with Sturdy
Dado Joints
High Current 1/4” Phone Jacks and
Neutrik Speakon™ Connectors
MkIIISeriesLoudspeakerSystemsareprofessional,full-
range, two-way, compact loudspeakers designed for
the most demanding permanent or portable sound
reinforcement requirements. Moreover, thesespeakers
are ideal for use as a two-way system or as the mid /
high pack in a three-way set-up incorporating a Fender
subwoofer loudspeaker system.
Titanium Diaphragm Horn
Active / Passive Crossover
Operation
With a wide response, low distortion and controlled
directivity, Mk III Series Loudspeaker Systems are
designed to form the basis of everything from a small
public addresssystemtothenightlyrigorsofa“working
band’s” sound system. After moisture sealing, the Mk
III Loudspeaker cabinets are covered in tough black
indoor/outdoor synthetic carpet covering. Likewise,
MkIIILoudspeaker cabinetsalsofeaturemetalcorners
and rubber feet for a longer life and lasting looks.
Metal Corners and Rubber Feet
Tough Indoor / Outdoor Synthetic
Carpet Covering
Only the finest components are used to provide
maximum efficiency and response. In order to more
fully understand the operational characteristics of
your Mk III Series Loudspeaker enclosure, please
read through this operational user’s guide.
CAUTION: Almost all speakers produce strong
magnetic fields which may interfere with the
normal operation of nearby electronic devices,
includingtelevisionsandcomputervideomonitors.
To reduce or eliminate interference, increase the
distance between this product and other nearby
electronic devices.
3
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SPEAKER WIRING AND CONNECTIONS
Parallelorseriesarethetwobasicwayswhichmultiple Keep in mind, power and audio signal cables are the
speakerscanbeconnectedtoasinglepoweramplifier. most common sources of sound system failure. Well
When speakers are connected in parallel, their made and carefully maintained cables are essential to
combined impedance decreases. For speakers wired thereliabilityoftheentiresoundsystem. Iflongspeaker
in series the opposite is true, their combined cablesarerequired,itisimportanttoensurethecable‘s
impedance increases. Thus, when speakers are wired gauge is sufficient to transfer all of the available
inseries,higherimpedancespeakersintheseriesdraw amplifier power to the speakers rather than absorbing
more power from the amplifier than do speakers in the the power itself. As a rule of thumb, larger wires are
series with lower impedances. When speakers are better as they conduct more power to the speakers
wired in parallel, the opposite is true. Higher (larger wire has smaller gauge numbers).
impedance speakers will draw less power from the
amplifier than lower impedance speakers will draw.
Below are two charts listing speaker wire gauges and
recommendations for best results.
At Fender®, we recommend connecting multiple
speakers in parallel for several reasons. First, if one
speakerfails,theotherswillcontinuetooperate. Second,
because in a series connection one speaker affects the
output of the other speakers, unpredictable frequency
response is a concern. Third, most speaker cabinets
are already wired for parallel connections making parallel
connections the most common wiring method.
SPEAKER WIRE GAUGE
100'-UP
10
12
12
14
14
16
(30.5 m-UP)
50'-100'
(15.25-30.5 m)
Below are two charts demonstrating how to calculate
both parallel and series impedance.
*25'-50'
14 *16 18
(7.60-15.25 m)
PARALLEL IMPEDANCE
10'-25'
16 18
18 18
18
1
Z
(3.05-7.60 m)
=
p
1
Z
1
Z
1
Z
+
...
1
2
n
0'-10'
18
16Ω* 5.3*
8Ω
8
(0.00-3.05 m)
4
5.3
+
-
+
-
4Ω
*8Ω 16Ω
A
B
8Ω* 16Ω
SPEAKER IMPEDANCE [z]
Cabinet A
+
-
*Example - If the speaker wire length
required is between 25-50 feet (7.60-
15.25 meters) and the speaker
impedance is 8Ω, the minimum
recommended speaker wire gauge is 16.
Impedance
*Example- Cabinet A is 8 ohms. Cabinet B is
16 ohms . The total impedance when connected
in parallel is:
1
Z
=
= 5.3 ohms.
p
1
8
1
16
+
Cross-
Resistance in Ω per foot
Section
AWG
[mm2]
0.83
(30.5 cm) @ 77º F (25º C)
SERIES IMPEDANCE
18
.00651
Z
=
Z
Z
Z
...
+
18 20* 24 32
8Ω 10 12 16 24
16Ω*
s
1
2
n
.00409
.00258
.00162
.00102
.00064
16
14
1.32
2.10
3.32
5.27
8.38
+
-
A
4Ω
2Ω
6
4
8
6
12 20
10 18
+
-
12
10
8
B
2Ω 4Ω* 8Ω 16Ω
+
-
Cabinet A
Impedance
*Example- Cabinet A is 4 ohms. Cabinet B is
16 ohms. The total impedance when
connected in series is 4 + 16 = 20 ohms.
4
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Mk III SERIES SPEAKER CONNECTIONS
SETUP SUGGESTIONS
In normal operation (using the passive internal
The placement of any speaker can dramatically affect
crossover), the 1/4" jacks and the Speakon™ its sound. Thus, there are several considerations to
review when placing loudspeakers.
Connectors are wired in parallel allowing any one of
the connectors to be used as an input and any other
as an output. This allows "daisy chaining" of multiple
loudspeakers, eliminating the need for several long,
cumbersome runs of speaker cable. During normal
mode, the connections are as follows:
First, the range of the horizontal coverage should be
determined. The speaker may be used as a single unit,
as part of a pair, or as part of a group of widely spaced
enclosures. In any case, maximum horizontal
coverage will be desired. Examples of these types of
setups are shown. The horn in this configuration has
a horizontal coverage angle of 90º and a vertical
coverage of 40º.
Polarity
Phone Jack
Speakon™
Positive (+)
Negative (-)
Tip
Sleeve
1+ and/or 2+
1- and/or 2-
When the switch on the back of the speaker is in the
bi-amp mode, the internal crossover and high
frequency attenuator are disabled. Thus, an external
crossover must be used with the speaker and two
channels of power amplification will be required: one
for the low frequencies and another for the high
frequencies. In bi-amp mode, the connections are as
follows:
Stage
Audience
Phone Jacks
Two speakers arranged as a mono or stereo
pair requiring maximum horizontal coverage
Left
Frequency
Polarity
Right
Speakon
N/A
Lows
Lows
Highs
Highs
Positive (+)
Negative (-)
Positive (+)
Negative (-)
Tip
1+
1-
2+
2-
N/A
Sleeve
N/A
30º
Tip
Sleeve
N/A
Mk III
Cabinet
Mk III
Cabinet
IMPORTANT: If the crossover switch is set to
external, DO NOT plug a full range signal into the
High Frequency input. Doing so will destroy the
compression driver.
Two speakers in a "loose pack" array
requiring maximum horizontal
coverage
NOTE:WhensettingupyourMkIII Seriesenclosures,
be sure to place the cabinets in such a way as to
minimize overlapping radiating patterns.
A second consideration is for feedback and bass
performance. If the speaker is placed near a large, flat
wall, the bass output will increase by approximately 6
dB. Placing the speaker near a wall can cause
feedback. If this occurs, the speaker must be moved.
A third consideration is to what degree the speaker
should be "heard and not seen", especially in
permanent installations. Remember, where the
speaker cabinets are placed will effect both their tone
and radiating patterns.
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BI-AMP OPERATION
UNPOWERED MIXER
MONITOR
OUT
MAIN
OUT
For versatility and increased headroom, some users
may choose to use an active electronic crossover /
processor, such as the Fender PCN-2 or PCN-4, with
the system. The electronic crossover takes the place
of the internal crossover of the speaker system. The
"Normal / Bi-Amp" switch on the back of the cabinet
must be set to the "Bi-Amp" position. Always check
to ensure the internal/external crossover switch
which selects passive or biamp operation is in the
correct position prior to use. Failure to do so may
damage the speakers. A typical set-up of a bi-amp
configuration is shown at right.
IN
PCN-2 ELECTRONIC CROSSOVER
HIGH
OUT
LOW
OUT
For those situations requiring a subwoofer, Mk III
loudspeakerscanstillbeusedifathree-wayelectronic
crossover is used. An example of this configuration is
shown on the next page.
A In
B In
It is strongly recommended that a fourth-order
"Linkwitz-Riley" or a digital FIR fourth-order active
crossover be used. The crossover frequency, for both
the 1225 Mk III / 1226 Mk III, should be set at
approximately 2200 Hz, the 1211 Mk III should be set
at approximately 1200 Hz. Since the output sensitivity
of the compression driver is higher than that of the
woofer, the high frequency output of the system must
be decreased at either the crossover (if such a control
is provided) or at the power amplifier(s) that are used
for the high frequencies.
B Out
Hi
A Out
SPL-9000 POWER AMP
Hi
SWITCHES
SET TO
Mk III
Mk III
Cabinet
EXTERNAL
Cabinet
CROSSOVER
Low
Low
Speakers operated in a bi-amp configuration
CAUTION: Be sure to connect the high frequencies
and low frequencies to their correct inputs
indicated on the back of the speaker cabinets.
CARPET COVERING CARE
Mk III Series cabinets are covered in a
tough, black indoor/outdoor synthetic
carpet for long life and lasting good
looks. To clean the carpet covering, use
a sponge and a light soapy water
solution to wipe away any smudges or
dirt. For stubborn stains, a slightly more concentrated
soapy solution or carpet shampoo with a brush may
be used. Avoid spilling liquids on the input panel, grille
and speakers.
6
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USING A 3-WAY ELECTRONIC CROSSOVER WITH MK III ENCLOSURES
UNPOWERED MIXER
MONITOR
OUT
MAIN
OUT
INPUT
HIGH
OUT
MID
OUT
LOW
OUT
PCN-4 ELECTRONIC CROSSOVER
B In
A In
A Out B Out
SPL-9000 POWER AMP
Hi
Hi
SWITCHES SET
TO EXTERNAL
CROSSOVER
Mk III
Cabinet
Mk III
Cabinet
Low
Low
A In
Bridge Out
SPL-9000 POWER AMP
Bridge Mono Mode
215s
Speakers operated in a bi-amp configuration with
a subwoofer (tri-amping)
7
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SPECIFICATIONS
MODEL
1211 Mk III
1225 MK III
1226 MK III
PART NUMBER
CABINET
071-1211-200
071-1225-200
071-1226-200
5/8" (1.6 cm)
Particle Board
3/4" (1.9 cm)
Birch Plywood
3/4" (1.9 cm)
Birch Plywood
CONNECTIONS
(2) 1/4" Phone Jacks
(2) 1/4" Phone Jacks
(2) Speakon™ Jacks
(2) 1/4" Phone Jacks
(2) Speakon™ Jacks
DRIVER
Low:
High:
15" (38 cm) woofer
15" (38 cm) woofer
15" (38 cm) woofers
3" (7.6 cm) voice coil
2.5" (6.4 cm) voice coil 3" (7.6 cm) voice coil
1" (2.5 cm) Exit Throat
Titanium Diaphragm
1" (2.5 cm) Exit Throat
Titanium Diaphragm
1" (2.5 cm) Exit Throat
Titanium Diaphragm
FREQUENCY On Axis
RESPONSE
+/- 3 dB:
50 Hz to 15kHz
95 dB
50 Hz to 15kHz
100 dB
38 Hz to 15kHz
100 dB
ON AXIS
SPL @
SENSITIVITY 1W/1m:
COVERAGE
PATTERN
Horizontal
Vertical
90º @ 5 kHz
40º @ 5 kHz
90º @ 5 kHz
40º @ 5 kHz
90º @ 5 kHz
40º @ 5 kHz
POWER RATING
300W program
150W EIA
400W program
200W EIA
800W program
400W EIA
NOMINAL IMPEDANCE
8Ω
8Ω
4Ω
CROSSOVER FREQUENCY
1200 Hz
2200 Hz
2200 Hz
DIMENSIONS Height
28.6" (72.6 cm)
20.3" (51.6 cm)
28.6" (72.6 cm)
19.8" (50.3 cm)
19.2" (48.8 cm)
46.5" (118.1 cm)
Width
Depth
25"
(63.5 cm)
(51.3 cm)
14"
(35.6 cm)
20.2
WEIGHT
68 lbs. (31 kg)
84 lbs. (38 kg)
126 lbs.(57 kg)
A PRODUCT OF:
FENDER MUSICAL INSTRUMENTS CORP.
CORONA, CA 91720 USA
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