Three-Way Quad-8-inch Mid/High CoEntrant Complex Conic Loudspeaker System

Self-powered PowerNet ST4R Series loudspeakers unite advanced technology and application-driven engineering to bring live sound closer to the ultimate reference point: reality. Patented CoEntrant M/H transducers and unique innovations such as 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.


ST4R PowerNet loudspeakers are RHAON empowered for flexible analog and digital signal distribution and loudspeaker management and control over a CAT 5 Ethernet network.

Key Features

• Compact Three-way Mid/High Loudspeaker Module
50 Hz to 18 kHz frequency response, high-level 133 dB peak SPL performance

• Flexible Input Configurations
Choose external bi-amplification, or go self-powered with the PM3R PowerNet Tri-Amplifier with RHAON for flexible analog and multi-channel digital signal distribution, computer control and supervision.

• Quad-8 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 an 8-inch cone and a 1-inch HF driver into a wideband, high-power true point source

• TRAP (True Array Principle) Design
ST4R and STX4 loudspeakers are true 40° TRAP modules that combine seamlessly to produce a phase aligned wave front virtually free of lobing.

• Choice of Coverage Patterns
40° by 40°, 60° by 40° and 90° by 40° coverage patterns.

PM-3R PowerNet Tri-Amplifier

The PM-3R is a new kind of intelligent electronic system. The heart of the ST4R, it combines Class D digital tri-amplification with RHAON, the Renkus-Heinz Audio Operations Network for comprehensive DSP controlled signal processing and control.

RHAON empowers you with CobraNet digital audio distribution, user-configurable DSP for maximum control, remote systems management from any Windows computer, life safety functions and more – all using standard Ethernet hardware and cabling.

The PM-3R offers dual analog inputs, dual CobraNet inputs and an AES3id serial input. The on-board DSP includes eight bands of parametric EQ, high and low shelving filters, delay and input level control, and is easily configured using RHAON software. Critical operating parameters such as signal clipping, amplifier output voltage and current, and temperature are continually monitored with automatic alert functions.


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: ST4 – ST4/44
ST4 – ST4/64
ST4 – ST4/94
1.4 V for rated power output
Max SPL: ST4 – ST4/44
ST4 – ST4/64
ST4 – ST4/94
Lows: 130 dB Peak
Mids: 129 dB Peak
Highs: 131 dB Peak
Dispersion: ST4 – ST4/44 40° H x 40° V
ST4 – ST4/64 60° H x 40° V
ST4 – ST4/94 90° H x 40° V
Freq. Response: All Models 50 Hz to 18 kHz
Mid/High Drivers: All Models CDT-1L; SSD1802S-8B 1″ HF (40 W RMS) & SSL8-9 8″MF (150 W RMS)
LF Drivers: All Models Four 8″model SSL8-12 woofers; 2.5″ VC; 200 W RMS (800 W RMS total)
Crossover Points: All Models 600 Hz & 1500 Hz
Power: All Models Lows: 800 W RMS @ 4 Ohms
Mid/Highs: 150 W RMS
@ 8 Ohms
Enclosure: All Models Multi-ply hardwood, perforated metal grille
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 30 1/4″ H x 16 5/8″ W x 23 1/2″ D
(76.8 cm x 42.2 cm x 59.7 cm)
Weight: ST4 – ST4/44
ST4 – ST4/64
ST4 – ST4/94
147.5 Lbs (66.9 kg) Net