Electro-Voice QRX-115/75-BLK Specifications

KEY FEA TURES

• Fully rotatable asymmetrical horn for use in any
cabinet position

• Externally switchable biamped or passive
operation

General Product Description

The QRx-115/75 is a two-way, full-range loudspeaker system
that incorporates a 15-inch woofer and a 3-inch voice coil
compression driver on an asymmetrical 75-degree x 50­degree fully rotatable constant-directivity horn. In factory­delivered position the horn provides a 15-degree up/35­degree down vertical coverage pattern. The five-sided
cabinet design allows this main PA system cabinet to easily
conform to duties as a floor monitor or to be tucked tightly
against a ceiling for low-profile applications. The fully
rotatable horn means regardless of cabinet position, pattern
control is fully user-determined.

The QRx-115/75 is a good solution for small-to-medium size
rooms as a main PA, providing moderate levels with good
bass response in music or speech reproduction for DJs or
live bands. The asymmetrical horn can allow a single box to
more adequately direct the high frequencies as needed, as
well as streamline multi-cabinet arrays 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
one 15-inch transducer with a cast aluminum basket as the
LF component 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 factory­delivered positioning 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 suspension allowing a full 360-degree rotation of
the horn. The enclosure shall be vented and tuned for
optimum low-frequency extension. An internal passive filter
network shall be included providing crossover filters or

QRx-115/75

Loudspeaker System

component bandpasses 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 60 Hz to 15 kHz (-3 dB) measured on axis. The
loudspeaker shall produce a sound pressure level (SPL) of
98 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 124 dB on axis at 1 meter. The full-range system
with passive network engaged shall handle 400 watts of
amplified power long term in compliance with AES-EIA
standards and have a nominal impedance of 8 ohms.

Speaker Description:

Part Number ............................................................... 300995-001

LF Section & Components .. 15-inch woofer in vented enclosure

HF Section & Components ................... DH7 compression driver

with 3-inch titanium diaphragm on asymmetric 75 x 50 horn

System Configuration ....................................Two-way, full-range

Powering Configuration................. Switchable passive or biamp

Recommended Active High-Pass Frequency (12 dB/octave

minimum) ............................................................................... 45 Hz

Recommended Active Crossover Frequency (24 dB/octave

typical) ............................................................................... 1500 Hz

Passive Crossover Frequency ....................................... 1800 Hz

Cabinet Type (shape) ....................................... Modified trapezoid

Enclosure Materials ..................................... 13-ply birch plywood

Finish .................................................. Black acrylic textured paint

Connectors ........................................................ Two Neutrik® NL4

Suspension Hardware............................. L-track top and bottom,

Single-stud plate on back for pull up

Grille................................. Powder-coated perforated 16-GA steel

Options:

WHI - white textured paint
UN - unfinished

Accessories............. SST-1 single stud rigging fitting (3 included)

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 have five sides
with the fifth side angle as such to provide stable and safe placement
of the cabinet on its side for floor monitor applications. Handles
shall be recessed within the sides of the enclosure and of such
design to allow safe handling from any direction. There shall be a
1-3/8 diameter pole mounting socket located on the bottom of the

Speaker Characteristics:

Frequency Response

- 3 dB .............................................................. 60 Hz - 15 kHz

- 10 dB ............................................................ 45 Hz - 16 kHz

Axial Sensitivity

SPL, 1 watt @ 1 m, Passive ......................................... 98 dB

SPL, 1 watt @ 1 m, Biamp (LF/HF) ....................... 98/110 dB

Impedance

Passive ....................................................................... 8 ohms

Biamp (LF/HF) ......................................................... 8/8 ohms

Power Handling

Passive

Long-Term EIA ........................................................ 400 watts

Short-term peak .................................................... 1600 watts

Biamp - LF

Long-Term EIA ........................................................ 400 watts

Short-term peak .................................................... 1600 watts

cabinet. 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 Electro­Voice model QRx-115/75.

Calculated Maximum SPL Output

Long-Term................................................................... 124 dB

Peak ............................................................................ 130 dB

Nominal Coverage Angle

Horizontal (-6 dB)....................................................... 75 Deg.

Vertical (-6 dB) .................................................. +15/-35 Deg.

Dimensions

Height ................................................... 29.90 in. (759.5 mm)

Width at front ........................................ 17.72 in. (450.2 mm)

Width at back .......................................... 7.59 in. (192.7 mm)

Depth .................................................... 16.02 in. (407.0 mm)

Trapezoid Angle ........................10 Deg. per side (254.0 mm)

Weights

Net Weight ......................................................... 71 lb (32 kg)

Shipping Weight ................................................. 78 lb (35 kg)

Top View

Front View

(with grille removed)

Dimensions

USA 12000 Portland Ave South, Bur nsville, MN 55337, Phone: [phone], Fax: [phone]
Canada 705 Progress Avenue, Unit 46, Scarborough, Ontario, Canada, M1H2X1, Phone: [phone], Fax: [phone]
Germany Hirschberger Ring 45, D94315, Straubing, Germany, Phone: [phone], Fax: [phone]
France Parc de Courcerin, Allee Lech Walesa, Lognes, 77185 Marne la Vallee, France, Phone: [phone], Fax: [phone]
Australia Unit 23, Block C, Slough Business Park, Slough Avenue, Silverwater, N.S.W. 2128, Australia, Phone: [phone], Fax: [phone]
Hong Kong Unit E & F, 21/F, Luk Hop Industrial Bldg., 8 Luk Hop St., San PO Kong, Kowloon, Hong Kong, Phone: [phone], Fax: [phone]
Japan 5-3-8 Funabashi, Setagaya-ku, Tokyo, 156-0055 Japan, Phone: [phone], Fax: [phone]
Singapore 3015A Ubi Rd 1,05-10, Kampong Ubi Industr ial Estate, Singapore 408705,Phone: [phone], Fax: [phone]
Mexico Av. Parque Chapultepec #66-201, Col. EI Parque Edo. De Mexico 53390, Mexico, Phone: [phone], Fax: [phone]
UK 4, The Willows Centre, Willow Lane, Mitcham,Surrey CR4 4NX, UK, Phone: [phone], Fax: [phone]
Africa,Mid-East Hirschberger Ring 45, D94315, Straubing, Germany, Phone: [phone], Fax: [phone]
Latin America 12000 Portland Ave South, Bur nsville, MN 55337, Phone: [phone], Fax: [phone]

www.electrovoice.com  Telex Communications, Inc.  www.telex.com

© Telex Communications, Inc. 7/2001
Part Number 38109-986 Rev A

Side View Back View

For customer orders, contact the Customer Service department at

For warranty repair or service information, contact the Service

For technical assistance, contact Technical Support at 866/78AUDIO

Please refer to the Engineering Data Sheet for warranty information.

800/392-3497 Fax: [phone]

Repair department at 800/685-2606

Specifications subject to change without notice.

U.S.A. and Canada only.