QRx-212/75
Dual 12-inch Full- Range
Loudspeaker System
General Product Description
The QRx-212/75 is two-way, full-range loudspeaker system
incor porating two 12-inch woofers and a 3-inch voice coil
compression driver on an asymmetrical 75-degree x 50-degree
fully rotatable constant-directivity horn. In factory delivered position,
this provides a 15-degree up/35-degree down vertical coverage
pattern. The trapezoidal cabinet design allows this main PA system
cabinet to easily conform to multi-cabinet arrangements or limited
space clearances without sacrificing internal volume. The fully
rotatable horn means regardless of cabinet position, pattern control
is user-determined. The QRx-212/75 is a good solution for medium
size rooms and audiences as a main PA providing moderate levels
with good bass response and added punch in the lower and mid
frequencies, satisfying most DJ and live band applications. The
asymmetrical horn can allow a single box to more adequately direct
the high frequencies as needed, as well as streamline multi-cabinet
arrays when rotated by extending horizontal coverage while
minimizing overlapping and allowing tighter packs between the
cabinets.
Architects’ and Engineers’ Specifications
The two-way, full-range loudspeaker system shall incorporate two
12-inch transducers with cast aluminum baskets as the LF
components and one 3-inch diameter voice coil/diaphragm
compression driver as the HF component. The compression driver
shall be mounted on a 75-degree x 50-degree asymmetrical
constant directivity horn with a factory delivered position of 15
degrees up/35 degrees down/50 degrees horizontal configuration.
The horn shall be constructed of a material and design so as to be
capable, structurally, of supporting the HF driver without any internal
braces or suspensions, allowing a full 360-degree rotation of the
horn. The enclosure shall be included, providing crossover filters
for component band passes and nominal system voicing. The input
panel shall incorporate two switches, allowing external configuration
between biamped or passive operation. Input connections shall be
accommodated with two paralleled NL4 female Speakon
®
connectors.
Loudspeaker system frequency response shall be no less than 52
Hz to 16 kHz (-3 dB) measured on axis. The loudspeaker shall
produce a sound pressure level (SPL) of 102 dB on axis at 1 meter
with a power input of 1 watt and shall be capable of sustaining a full
power, long-term average output of 129 dB on axis at 1 meter (135
dB peaks). The full-range system, with passive network engaged,
shall handle 600 watts of amplified power long-term in compliance
with AES-EIA standards and have a nominal impedance of 4 ohms.
The loudspeaker enclosure shall be constructed of 13-ply void-
free cross-grain-laminated Birch plywood. It shall be finished in black
or white acrylic paint or available unfinished. It shall be of a
trapezoidal shape. Handles shall be recessed within the sides of
the enclosure and of such design to allow safe handling from any
direction. The top and bottom of the enclosure shall have L-track
rigging installed and the rear shall have a pull-up point. Three single
studded ancra fittings rated for overhead use shall be included with
each loudspeaker system. Fittings shall include a tethered safety
pin to ensure proper installation.
The two-way full-range loudspeaker system shall be the Electro-
Voice model QRx-212/75.
KEY FEATURES
•
Fully Rotatable Asymmetrical Horn for use in any
cabinet
•
Externally Switchable Biamp or Passive Operation
