Loyola Enterprises

A veteran and minority owned SDB Certified Business.



757.498.6118 Ext - 109QRx-115/75 - Call for pricing - 15-inch two-way 400 watt loudspeaker


PDFQRx-115/75 Specifications (pdf)

The QRx-115/75 is a 15" two-way, full-range loudspeaker system with 400 watts continuous, 1,600 watts peak power handling. Can be easily bi-amped with 400 watts LF and 75 watts HF continuous DH7 3" voice coil compression driver on an asymmetrical 75° x 50° fully rotatable constant-directivity horn. In factory-delivered position the horn provides a 15° up/35° down vertical coverage pattern. The fully rotatable horn means that 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.

Five-sided cabinet design allows the system to be used as a floor monitor, as a front-of-house system or to be tucked tightly against a ceiling for low-profile applications. Available in black or white. 13-ply, void-free plywood enclosure comes equipped with metal stand mount, L-track rigging on the top and bottom and a single-stud pull-up point on the rear of the enclosure for use flexibility. It features Ring-Mode Decoupling for beautifully detailed vocals and smooth midrange performance.


  • 15" Two-Way Full-Range Loudspeaker System
  • Fully rotatable asymmetrical horn for use in any cabinet position
  • Externally switchable biamped or passive operation
  • DL15ST 15" woofer in vented enclosure
  • DH7 compression driver with 3" titanium diaphragm
  • Parallel Neutrik® NL4 input connections

Architectural and Engineering 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 factory-delivered 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 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.

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 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 Electro-Voice model QRx-115/75.

Frequency Response (-3dB) 60 Hz–15 kHz LF Power Handling 400 W cont. / 800 W prog. / 1600 W peak
Frequency Range (-10dB) 45 Hz–16 kHz HF Power Handling 75 W cont. / 150 W prog. / 300 W peak
Sensitivity 1 W/1 m (LF/HF) 98 dB / 110 dB Crossover Frequency 1500 Hz (24dB/oct.)
Max SPL/ 1m (calc) 130 dB Rec. High-Pass Freq. 45 Hz (12dB/oct.)
Coverage (HxV) 75° x 50° Nominal Impedance 8 Ω
Connectors (2) Neutrik Speakon NL4’s Suspension L-Track
Enclosure Material 13-ply Birch plywood w/ black acrylic textured finished Grille Powder coated perforated 16-GA steel
Dimensions (HxWxD) 75.9 x 45.0 x 40.7 cm
(29.9" x 17.7" x 16.0")
Weight 32 kg (71 lbs)
For pricing options and packages, contact us at
757.498.6118 Ext - 109, Or