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MD Series

ModularDesign Loudspeakers


ModularDesign Loudspeakers are no longer in production.
QSC Audio will continue to support and service these products.
MD Series
Models pictured: MD-F122/64r, MD-F152/124r, and MD-L118.

MD Series Loudspeakers

MD-F122/64r  |  MD-F122/94r  |  MD-F122/124r  |  MD-F152/64r  |  MD-F152/94r  |  MD-F152/124r  |  MD-L115  |  MD-L118


The ModularDesign™ Series offers exceptional performance in a wide variety of applications, including houses of worship, performing arts facilities, hotels, casinos, night clubs, and sporting facilities. Specifying MD Series is appropriate anywhere there is a need for dependable high performance loudspeakers with predictable coverage and extended frequency response. For design / build contractors and electroacoustic design consultants, the MD Series offers an effective solution to the myriad of challenges encountered in the design and implementation of permanently installed sound reinforcement systems.

Designed as a family of modular, arrayable loudspeakers, the full-range MD family includes six models: three models with 12" LF sections, and three with 15" LF sections. Nominal coverage patterns of 60° x 40°, 90° x 40° and 120° x 40° are available with either low-frequency complement. In addition, two low-frequency only MD systems, the MD-L115 and MD-L118, share the common form factor of the full-range systems. All share the same 35" tall, 30° trapezoidal enclosure as their MD Powered Series counterparts.

The form factor common to all MD loudspeaker models makes creating full range or combined full range/low-frequency clusters painless. The enclosures are designed with 30° angles; wall-to-wall tight packing enclosures splay the 60° x 40° horns perfectly and provide uniform coverage in any multiple of 60° to 360°. No gaps or spacers are required and the radial form of the front surface of the enclosures forms a contiguous cylindrical surface for a clean and aesthetically pleasing appearance. Each enclosure is equipped with a total of fifteen 3/8"-16 threaded attachment points offering the installer tremendous flexibility in suspension and mounting.

Low-frequency transducers feature technically advanced 4" voice coils assembled with proprietary high temperature adhesives, vented magnet assemblies and highly optimized motor design to provide excellent dynamic range, flat frequency response and a very low distortion figure.

High-frequency compression drivers feature a Neodymium magnet motor structure and 65 mm (2.5") aluminium voice coil and titanium diaphragm plus a pole piece mounted copper shorting cap for extended HF response.

FEATURES

  • All full-range models feature a rotatable high-frequency horn - enabling them to be utilized either vertically or horizontally
  • 2-way models can be operated in either full-passive or bi-amplified mode
  • The MD Series is available in either black or white finishes
  • System enclosures employ the same dimensions and 15 attachment points
  • All models constructed in a trapezoidal design of multi-ply birch with a powder coated steel grille
  • When employing the 60 degree horn, the 30 degree trapezoidal angles minimize negative interference between tight-packed enclosures

Clusters of MD speakers
Clusters of MD speakers can provide up to 360 degrees of coverage.
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MODULAR DESIGN SERIES


DOCUMENTS

MD Series Specifications (PDF 456K)
Array Link Kits (PDF 646K)
Juego de Placas de Acoplamiento para Arreglos (PDF 667K)

HI-RES IMAGES

Group Photo
White Enclosure

RESOURCES

MD-F122 Frequency Response
MD-F152 Frequency Response
MD-L115 & MD-L118 Frequency Response
Enclosure Dimensions

EASE DOWNLOADS

MD Series EASE data

DSP SPEAKER VOICINGS

MD Series Speaker Voicings

CAD DRAWINGS

MD-122/64r (DXF, zipped 102k)
MD-122/94r (DXF, zipped 63k)
MD-122/124r (DXF, zipped 84k)
MD-152/64r (DXF, zipped 69k)
MD-152/94r (DXF, zipped 63k)
MD-152/124r (DXF, zipped 80k)
MD-L115 (DXF, zipped 43k)
MD-L118 (DXF, zipped 41k)
MD Series 3D (DWG, zipped 2.6MB)






MD Series in white
Also available in white
 
MD-F122 MD-F122/64r MD-F122/94r MD-F122/124r
SPECIFICATIONS
 MD-F122/64r MD-F122/94r MD-F122/124r
Configuration LF: 12" transducer with 4" voice coil, ferrite magnet

HF: 60° x 40° rotatable horn with 1.4" exit dia., 2.5" voice coil, neodymium magnet

Switchable Bi-Amp/Passive		 LF: 12" transducer with 4" voice coil, ferrite magnet

HF: 90° x 40° rotatable horn with 1.4" exit dia., 2.5" voice coil, neodymium magnet

Switchable Bi-Amp/Passive		 LF: 12" transducer with 4" voice coil, ferrite magnet

HF: 120° x 40° rotatable horn with 1.4" exit dia., 2.5" voice coil, neodymium magnet

Switchable Bi-Amp/Passive
Frequency Response (-6 dB) 1
Frequency Range (-10 dB) 1		 50 Hz - 18 kHz
45 Hz - 18.5 kHz		 50 Hz - 17 kHz
45 Hz - 20 kHz		 50 Hz - 15 kHz
45 Hz - 18 kHz
Impedance
  Passive
  Biamp
8 ohms
LF: 8 ohms / HF: 8 ohms
8 ohms
LF: 8 ohms / HF: 8 ohms
8 ohms
LF: 8 ohms / HF: 8 ohms
Sensitivity 2
  Passive
  Biamp
95 dB
LF: 95 dB / HF: 110 dB
95 dB
LF: 95 dB / HF: 109 dB
95 dB
LF: 95 dB / HF: 107 dB
RMS Power Handling
  Passive 3
  Biamp 4
400 W
LF: 500 W / HF: 63 W
400 W
LF: 500 W / HF: 63 W
400 W
LF: 500 W / HF: 63 W
Maximum Output at 1 meter
Passive Continuous 5
  Peak 6
Biamp Continuous 5
  Peak 6

121 dB
127 dB
LF: 122 dB / HF: 128 dB
LF: 128 dB / HF: 134 dB

121 dB
127 dB
LF: 122 dB / HF: 127 dB
LF: 128 dB / HF: 133 dB

121 dB
127 dB
LF: 122 dB / HF: 125 dB
LF: 128 dB / HF: 131 dB
Recommended Amplifier Power
  Passive
  Biamp
800 W
LF: 1000 W / HF: 125 W
800 W
LF: 1000 W / HF: 125 W
800 W
LF: 1000 W / HF: 125 W
Nominal Coverage, -6 dB 60°x40° 90°x40° 120°x40°
Input Connectors Terminal Strips
Suspension Points 15 load-rated attachment points that accept 3/8"-16 threaded hardware
Enclosure Material Baltic birch plywood
Finish Wear-resistant textured paint. Available in black or white
Dimensions 35" H x 20.5" W x 16.67" D
(889 mm x 512 mm x 423.4 mm) 		35" H x 20.5" W x 16.67" D
(889 mm x 512 mm x 423.4 mm) 		35" H x 20.5" W x 16.67" D
(889 mm x 512 mm x 423.4 mm)
Weight 86 lbs (39 kg) net
100 lbs (45.4 kg) shipping 		86 lbs (39 kg) net
100 lbs (45.4 kg) shipping 		86 lbs (39 kg) net
100 lbs (45.4 kg) shipping

MD-F152 MD-F152/64r MD-F152/94r MD-F152/124r
SPECIFICATIONS
 MD-F152/64r MD-F152/94r MD-F152/124r
Configuration LF: 15" transducer with 4" voice coil, ferrite magnet

HF: 60° x 40° rotatable horn with 1.4" exit dia., 2.5" voice coil, neodymium magnet

Switchable Bi-Amp/Passive		 LF: 15" transducer with 4" voice coil, ferrite magnet

HF: 90° x 40° rotatable horn with 1.4" exit dia., 2.5" voice coil, neodymium magnet

Switchable Bi-Amp/Passive		 LF: 15" transducer with 4" voice coil, ferrite magnet

HF: 120° x 40° rotatable horn with 1.4" exit dia., 2.5" voice coil, neodymium magnet

Switchable Bi-Amp/Passive
Frequency Response (-6 dB) 1
Frequency Range (-10 dB) 1		 50 Hz - 16.5 kHz
45 Hz - 18.5 kHz		 50 Hz - 17 kHz
45 Hz - 20 kHz		 50 Hz - 17 kHz
45 Hz - 20 kHz
Impedance
  Passive
  Biamp
8 ohm
LF: 8 ohm / HF: 8 ohm
8 ohm
LF: 8 ohm / HF: 8 ohm
8 ohm
LF: 8 ohm / HF: 8 ohm
Sensitivity
  Passive 2
  Biamp
95 dB
LF: 95 dB / HF:110 dB
95 dB
LF: 95 dB / HF:107 dB
95 dB
LF: 95 dB / HF:107 dB
Maximum Output at 1 meter
Passive Continuous 5
  Peak 6
Biamp Continuous 5
  Peak 6

122 dB
128 dB
LF: 123 dB / HF: 128 dB
LF: 129 dB / HF: 134 dB

122 dB
128 dB
LF: 123 dB / HF: 127 dB
LF: 129 dB / HF: 133 dB

122 dB
128 dB
LF: 123 dB / HF: 125 dB
LF: 129 dB / HF: 131 dB
RMS Power Handling
  Passive 3
  Biamp 4
400 W
LF: 500 W / HF: 63 W
400 W
LF: 500 W / HF: 63 W
400 W
LF: 500 W / HF: 63 W
Recommended Amplifier Power
  Passive
  Biamp
800 W
LF: 1000 W / HF: 125 W
800 W
LF: 1000 W / HF: 125 W
800 W
LF: 1000 W / HF: 125 W
Nominal Coverage, -6 dB 60°x40° 90°x40° 120°x40°
Input Connectors Terminal Strips
Suspension Points 15 load-rated attachment points that accept 3/8"-16 threaded hardware
Enclosure Material Baltic birch plywood
Finish Wear-resistant textured paint. Available in black or white
Dimensions 35" H x 20.5" W x 16.67" D
(889 mm x 512 mm x 423.4 mm) 		35" H x 20.5" W x 16.67" D
(889 mm x 512 mm x 423.4 mm) 		35" H x 20.5" W x 16.67" D
(889 mm x 512 mm x 423.4 mm)
Weight 85 lbs (38 kg)
100 lbs (45.4 kg) shipping 		85 lbs (38 kg)
100 lbs (45.4 kg) shipping 		85 lbs (38 kg)
100 lbs (45.4 kg) shipping

MD-L115
MD-L118 		MD-L115 MD-L118
SPECIFICATIONS
 MD-L115 MD-L118
Configuration 15" long-throw woofer with 4" voice coil; aluminum demodulating ring 18" long-throw woofer with 4" voice coil; aluminum demodulating ring
Frequency Response (-6 dB) 1
Frequency Range (-10 dB) 1		 48 Hz - 1.8 kHz
35 Hz - 1.9 kHz		 55 Hz - 2.2 kHz
45 Hz - 2.5 kHz
Impedance
 8 ohms
 8 ohms
Sensitivity 2
 95 dB
 96 dB
RMS Power Handling 3
 900 W* 900 W*
Maximum Output at 1 meter
  Continuous 5
  Peak 6
125.5 dB
131.5 dB

127.5 dB
133.5 dB
Recommended Amplifier Power 1800 W 1800 W
Input Connectors Terminal Strips
Suspension Points 15 load-rated attachment points that accept 3/8"-16 threaded hardware
Enclosure Material Baltic birch plywood
Finish Wear-resistant textured paint. Available in black or white
Dimensions 35" H x 20.5" W x 16.67" D
(889 mm x 512 mm x 423.4 mm) 		35" H x 20.5" W x 16.67" D
(889 mm x 512 mm x 423.4 mm)
Weight 90 lbs (41 kg) 89 lbs (40 kg)

1 Free Field Response (4pi)
2 1 W, 1 M Free-Field (4pi) except MD-L115 & MD-L118 which are groundplane measurements
3 Measures per AES1984
4 AES1984 50 - 500 Hz (LF), 1 - 10 kHz (HF); Power = V2 / Zmin
5 Calculated based on sensitivity and continuous power handling capacity
6 Calculated based on sensitivity and 6 dB peak-to-average ratio of signal used for continuous power handling test
* AES1984-2, 40 - 400, 2 hours; Power = V 2 / Zmin
Specifications subject to change without notice.

ModularDesign is a trademark of QSC Audio Products, LLC

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