High-Power Quad 12-inch Three-Way Mid/High CoEntrant Complex Conic Loudspeaker System

Non-powered STX9 Series loudspeakers unite advanced technology and application-driven engineering to bring live sound closer to the ultimate reference point: reality. Patented CoEntrant Mid/Hi transducers and unique innovations like our Complex Conic Horns combine to deliver natural sounding music and intelligible speech. Wherever audiences and operators demand superior performance and ease of use, ST/STX Series loudspeakers are an excellent choice for transparent, reference quality performance.


STX9 loudspeakers are non-powered, for use with external amplification.

Key Features

• Compact Three-way Design – Unparalleled Performance
Accurate, full-range 40 Hz to 18 kHz frequency response, high-level 142 dB peak SPL performance

• Flexible Input Configurations
Choose external bi-amplification.

• Quad-12 Doublet Low Frequency Design
Provides superior low frequency directionality in both horizontal and vertical planes.

• Exclusive Complex Conic Design
Provides constant beamwidth/directivity without the issues associated with conventional rectangular horns.

• Patented CoEntrant Topology
Integrates the acoustic output of a 10-inch cone and a 2-inch HF driver into a wideband, high-power true point source

• TRAP (True Array Principle) Design
ST9/44ASR and STX9/44AS Models are true 40° TRAP modules that com bine seamlessly to produce a phase aligned wave front virtually free of lobing. The /64 and /94 models can be turned into TRAP modules by rotating their horn 90 degrees.

• Choice of Coverage Patterns
Choose between tightly controlled 60° by 40°, 90° by 40° and asymmetrical 40° by 40° (+10°, -30°) coverage patterns.


Virtually any application where directional control and array-ability are critical issues and outstanding sonic performance is required.

• Distributed systems in sports arenas and stadiums.

• Multi-channel A/V playback systems, live sound and music systems in dance clubs (with optional subwoofers)

• Side fill in all types of sound reinforcement systems.

• Array modules for theatrical and concert sound systems, sound reinforcement systems in houses of worship.

Technical Information

Sensitivity: STX9/44
Lows: 101 dB
Mids: 104 dB
Highs: 109 dB
Max SPL: STX9/44
Lows: 139 dB Peak
Mids: 137 dB Peak
Highs: 134 dB Peak
Dispersion: STX9/44 40° H x 40° V Asym. (+10°, -30°)
STX9/46 60° H x 40° V
STX9/94 90° H x 40° V
Freq. Response: All Models 40 Hz to 18 kHz
Mid/High Driver: All Models CDT-2A; SSD3302-8A 2″ HF (75 W RMS) & SSL10-5 10″ MF (300 W RMS)
LF Drivers: All Models Four 12″ model SSL12-10 woofers; 3″ VC ; 400 W RMS (1600 W RMS total)
Crossover Points: All Models 350 Hz & 1500 Hz
Power: STX9/44
Lows: 1600 W RMS @ 4 Ohms
Mid/Highs: 300 W RMS @ 8 Ohms
Enclosure: All Models Multi-ply hardwood, perforated metal grille
Connectors: STX9/44
Neutrik 4-pin connectors or screw terminals
Finish: All Models Black, White or Natural (unfinished) paint
Custom Color
Weather Resistant
TuffTex (black only)
Hardware: All Models 12-point Universal Mounting Hardware
AeroQuip fly-track
R-Hang hardware
Dimensions: All Models 50″ H x 24″ W x 32 1/4″ D
(127 cm x 61 cm x 81.9 cm)
Weight: STX9/44
232.5 Lbs (105.5 kg) Net