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Mackie Designs continually engages in research related to product improvement. New material, produc-
tion methods, and design refinements are introduced into existing products without notice as a routine
expression of that philosophy. For this reason, any current Mackie Industrial product may differ in some
respect from its published description, but will always equal or exceed the original design specifications
unless otherwise stated. ©1999-2002 Mackie Designs Inc. All rights Reserved. Mackie and the "Running
Man" figure are registered trademarks of Mackie Designs Inc. Mackie Industrial is a trademark of Mackie
Designs Inc.
Compact Coaxial Speaker
MR3STK
SPEAKER
MR3STK
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Architects’ and Engineers’ Specifications
The two-way loudspeaker system shall be self-contained
and consist of the following components: (1) a low-frequency
driver; (2) a high-frequency dome tweeter driver that is
coaxial with the low-frequency driver; (3) a two-way crossover
network; (4) a constant voltage transformer; (5) a vented
enclosure.
The low-frequency transducer shall be a cone type
loudspeaker having a carbon fiber cone with a diameter of
at least 4.75 inches (120mm). It shall present a nominal
load impedance of 8 ohms to the crossover network.
The high-frequency driver shall be a titanium metalized
dome tweeter having a diameter of at least 0.5 inches
(13mm). Its voice coil shall be treated with Ferrofluid
®
to aid
in cooling. It shall present a nominal load impedance of 8 ohms
to the crossover network.
The system shall be crossed over by an internal, high-
level, passive network having a response of 12 dB/octave.
The nominal crossover frequency shall be 6kHz. The low-pass
section of the network shall have minimum inductance in
series with the low-frequency driver. A dynamic high-frequen-
cy protection circuit based on a low-value, low-mass filament
resistor shall limit the current available to the high-frequency
driver. The crossover network shall present a nominal 4-ohm
load impedance to the power amplifier or built-in constant
voltage transformer.
The constant voltage transformer shall have multiple
power taps at 1, 2.5, 5, 10 and 20 Watts. It shall also have
voltage taps at 25, 50, 70 and 100 volts. Two detented rotary
switches shall be provided on the input panel to adjust the
power and voltage taps of the transformer. The voltage tap
switch shall have a position to bypass the transformer and
allow the loudspeaker to present a 4-ohm load to a directly
coupled power amplifier.
The enclosure shall be a vented design. It shall be
constructed using high density polystyrene and finished with
black (or white), scratch resistant paint. It shall be trapezoidal
in shape with 45° angled sides. A full size, detachable, per-
forated steel grille, finished in black (or white) scratch resis-
tant paint shall be provided. At least 4 reinforced threaded
metal sockets (3/8" and M6) for attaching optional mounting
hardware shall be provided. The overall dimensions of the
enclosure shall not exceed (HxWxD) 8.27" x 5.91" x 5.31"
(210mm x 150mm x 135mm). The total weight of the loud-
speaker shall not exceed 5.5 lbs. (2.5 kg). Connections to the
loudspeaker shall be two color coded, spring loaded push
connectors.
The loudspeaker system shall have an overall frequency
response of at least 140Hz–21kHz when measured to –10 dB
and at least 180Hz–19kHz when measured to –3 dB. It shall
have a nominal average coverage pattern of at least 110°
horizontal by 110° vertical to –6 dB when measured between
800Hz and 16kHz. Calculated 1W/1m sensitivity shall be at
least 89 dB when measured in the far field between 300Hz
and 3kHz. Maximum SPL shall be at least 108 dB at 1m. The
loudspeaker shall be rated for continuous operation at 35W
IEC with 140W peaks.
The two-way loudspeaker system shall be a model
MR3STK (MR3SWTK - white) manufactured by Mackie
Industrial.
www.mackieindustrial.com
16220 Wood-Red Rd. NE, Woodinville, WA 98072 USA
888.337.7404, fax 425.487.4337, [email protected]
UK
+44.1268.571.212, fax +44.1268.570.809, [email protected]
ITALY
+39.0522.354.111, fax +39.0522.926.208, [email protected]
FRANCE
+33.3.8546.9160, fax +33.3.8546.9161, [email protected]
GERMANY
+49.2572.96042.0, fax +49.2572.96042.10, [email protected]
Electronic files for this product available at:
www.mackieindustrial.com
This Specification Sheet MR3STK.PDF
Quick-Start Manual MR3STKQS.PDF
part no. 910-178-10 Rev.C
(continued Architects’ & Engineers’ Specs)
SPEAKER
