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MR4/4T
Compact Two-Way Speaker
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 constant directivity horn driven by a dome tweet-
er 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 loud-
speaker having a carbon fiber cone with a diameter of at least
5 inches (130mm). It shall present a nominal load impedance
of 8 ohms to the crossover network.
The high-frequency section shall consist of a constant
directivity horn driven by a Mylar
diameter of at least 0.5 inches (12.7mm). 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
and equalization for the constant directivity horn. The nomi-
nal crossover frequency shall be 4kHz. The low-pass section
of the network shall have minimum inductance in series with
the low-frequency driver. A dynamic high-frequency protec-
tion 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, 5, 10, 20 and 30 Watts. It shall also have
voltage taps at 25, 50, 70 and 100V. 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 con-
structed 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, perfo-
rated steel grille, finished in black (or white) scratch resistant
paint shall be provided. At least 4 reinforced threaded metal
sockets (3/8" and M6) for attaching optional mounting hard-
ware shall be provided. The overall dimensions of the enclo-
sure shall not exceed (HxWxD) 10.32" x 7.17" x 6.57"
(262mm x 182mm x 167mm). The total weight of the loud-
speaker shall not exceed 6.6 lbs. (3 kg). Connections to the
loudspeaker shall be two color-coded, spring-loaded push
connectors.
www.mackieindustrial.com
16220 Wood-Red Rd. NE, Woodinville, WA 98072 USA
888.337.7404, fax 425.487.4337, industrial@mackie.com
UK
+44.1268.571.212, fax +44.1268.570.809, uk@mackie.com
ITALY
+39.0522.354.111, fax +39.0522.926.208, italy@mackie.com
FRANCE
+33.3.8546.9160, fax +33.3.8546.9161, france@mackie.com
GERMANY
+49.2572.96042.0, fax +49.2572.96042.10, germany@mackie.com
®
dome tweeter having a
(continued Architects' & Engineers' Specs)
The loudspeaker system shall have an overall frequency
response of at least 75Hz–21kHz when measured to –10 dB
and at least 160Hz–18kHz when measured to –3 dB. It shall
have a nominal average coverage pattern of at least 120°
horizontal by 100° vertical to –6 dB when measured between
800Hz and 16kHz. Calculated 1W/1m sensitivity shall be at
least 88 dB when measured in the far field between 300Hz
and 3kHz. Maximum SPL shall be at least 109 dB at 1m. The
loudspeaker shall be rated for continuous operation at 60W
IEC with 240W peaks.
The two-way loudspeaker system shall be a model MR4T
(MR4WT - white) manufactured by Mackie Industrial.
Electronic files for this product available at:
www.mackieindustrial.com
This Specification Sheet
Quick-Start Manual
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" symbol are registered trademarks of Mackie Designs Inc. Mackie Industrial is a trademark of Mackie
Designs Inc.
MR4T.PDF
MR4TQS.PDF
part no. 910-192-10 Rev.C
6
O F 6 P A G E S
oF 6 PAG E S
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