Compact Two-Way Speaker System
PA281
oF 6 PAGES
6
O F 6 P A G E S
Architects’ and Engineers’ Specifi cations
The two-way loudspeaker system shall be self-contained
and consist of the following components: (1) two 8-inch, low-
frequency drivers; (2) a high-frequency section consisting of
a constant-directivity horn and compression driver; (3) a two-
way crossover network; (4) a vented enclosure.
The two low-frequency transducers shall be cone type loud-
speakers having cone diameters of at least 8 inches/203 mm.
They shall have voice coils of at least 3 inches/76 mm in
diameter and carbon fi ber diaphragms. Together they shall
present a nominal impedance load of 4 ohms. Sensitivity
shall be at least 92 dB when measured at 1 m with an input
of 1 watt.
The high-frequency section shall have a compression
driver with a titanium diaphragm of at least 1.75 inches/44
mm in diameter. It shall present a constant-impedance load
of 8 ohms. It shall be connected to a constant-directivity
horn having a throat diameter of at least 1 inch/25 mm and a
nominal coverage pattern of 100° horizontal by 85° vertical.
Sensitivity shall be at least 107 dB when measured at 1 m
with an input of 1 watt.
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 2.1 kHz. The low-
pass section of the network shall have minimum inductance
in series with the low-frequency drivers. The high-pass
section of the network shall be equalized to optimize the
performance of the constant-directivity horn. A dynamic
high-frequency protection circuit based on a low-value, low-
mass fi lament resistor shall limit the current available to the
compression driver. A connection option shall be provided to
disconnect the crossover network, but not the high-frequency
protection circuit, from the drivers to allow bi-amp operation.
Connections to the loudspeaker shall be screw terminal
connectors.
The enclosure shall be a vented design with an internal
volume of at least 0.83 cubic feet. The vent shall be tuned to
60 Hz. It shall be constructed using 0.75 inch/19 mm, void-
free birch plywood and fi nished with black, scratch-resistant
paint. It shall be trapezoidal shaped with 15° angled sides.
A full size, detachable, perforated steel grille, fi nished in
black scratch-resistant paint shall be provided. At least 9
reinforced threaded metal sockets (M10, M8) for attaching
mounting hardware and three eye bolts shall also be provid-
ed. The overall dimensions of the enclosure shall not exceed
30.3 in/770 mm x 12.0 in/305 mm x 12.9 in/328 mm).
The performance of the two-way loudspeaker system shall
be as follows: long-term power handling, at least 300 watts
rms; peak power handling, at least 1200 watts; frequency
response, 60 Hz–13 kHz at –3 dB; maximum SPL, 123 dB
(anechoic–1m); sensitivity, 92 dB SPL (1W/1m anechoic);
–6 dB coverage, measured average 800 Hz–16 kHz, 100°
horizontal by 85° vertical. The two-way loudspeaker system
shall be a model PA281 manufactured by Mackie Designs.
Electronic fi les for this product available at:
www.mackie.com
Electronic fi les for this product available at:
Electronic fi les for this product available at:
This Specifi cation Sheet
This Specifi cation Sheet PA281.PDF
PA281.PDF
part no. 910-150-10 Rev. C
(continued Architects’ & Engineers’ Specs)
SPEAKER
PA281
www.mackie.com
16220 Wood-Red Road. 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]
UK
UK
ITALY
+39.0522.354.111, fax +39.0522.926.208, [email protected]
FRANCE
+33.3.85.46.91.60, fax +33.3.85.46.91.61, [email protected]
GERMANY
+49.2572.96042.0, fax +49.2572.96042.10, [email protected]
GERMANY
GERMANY
Mackie Designs continually engages in research related to product improvement. New material,
production methods, and design refi nements are introduced into existing products without notice as a
routine expression of that philosophy. For this reason, any current Mackie product may differ in some
respect from its published description, but will always equal or exceed the original design specifi cations
unless otherwise stated. ©2002 Mackie Designs Inc. All rights Reserved. Mackie and the "Running Man"
fi gure are registered trademarks of Mackie Designs Inc.
