Audison Prima APBX 8 AS2 Subwoofer Box

Award-Winning Compact Active Subwoofer with He-Li Amplification and OEM Integration
Winner of the EISA Best Product Award 2018–2019, the Audison Prima APBX 8 AS2 sets the benchmark in compact active subwoofer systems. Designed around a high-efficiency 8-inch APS 8 DL woofer, this low-profile subwoofer delivers 500W peak and 250W RMS through a built-in He-Li (High Efficiency / Low Impedance) D-Class amplifier that operates without a traditional DC-DC booster, achieving up to 90% efficiency.

Engineered for dynamic performance even at high volumes, its DBT (Dynamic Bass Tracking) input stage actively prevents distortion by predicting and managing signal peaks. With its 2S² (2 Sides / 2 Sounds) design, users can choose between down-firing or up-firing orientation for either extended low-end response or punchier, more defined bass.

Perfect for tight trunk spaces, this ultra-compact sub features ART (Automatic Remote Turn-On), high-level and RCA inputs for OEM and aftermarket compatibility, and complete DSP-friendly filtering and phase control. Installation is quick and secure with SSP (Sub Smart Plug) and included leveling feet, grille, and HRC AP remote control.

Key Features

Amplification & Performance

• Integrated 250W RMS / 500W Peak He-Li D-Class amplifier
• Ultra-high 90% efficiency—no switching power supply required
• DBT (Dynamic Bass Tracking) ensures clean, controlled output even at max volume
• 8” APS 8 DL driver with wide linear excursion (9mm one-way) for deep bass in compact form
• Sealed air suspension enclosure optimized for tight, low-frequency reproduction

Connectivity & Control

• Butterworth low-pass filter (12 dB/Oct.) with adjustable cutoff (50–300 Hz)
• Bass Boost control (0–6 dB @ 45 Hz) and Phase adjustment (0°–180°)
• Defeatable filter for AP bit processor users
• High-level input via multi-pin connector for OEM integration
• RCA low-level input for aftermarket sources
• ART function (Automatic Remote Turn-On) via remote-in, signal, or voltage detection

Design & Installation

• 2S² Installation Options:
  • Down-Firing: deeper bass extension
  • Up-Firing: punchier and more defined response
• Ultra-slim enclosure: only 6.22 in. (158mm) tall
• Rounded reinforced corners reduce enclosure resonance and aid trunk placement
• Protective metal grille and Velcro leveling feet for stability and safety
• SSP (Sub Smart Plug) terminal allows fast, secure plug-and-play connection

Included Technologies

• He-Li Amplifier: High Efficiency / Low Impedance Class-D amp—no switching PSU
• DBT (Dynamic Bass Tracking): Real-time peak prediction for distortion-free output
• 2S² Design: Dual orientation (Up-Firing/Down-Firing) for acoustic flexibility
• SSP Terminal: Plug & Play terminal block for easy and safe disconnection

Box Contents

• APBX 8 AS2 Subwoofer Box
• HRC AP Remote Control:
  • Mounts discreetly on the dashboard
  • Allows real-time subwoofer level and main volume adjustment
  • Compact, ergonomic design for easy in-car use
• Protective Metal Grille
• Velcro-Foot Leveling Pads
• Mounting Accessories & Plug Connectors