STX851A

Advanced Digital Bass Restoration

The STX Audio STX851A is engineered to restore and enhance low-frequency detail lost in compressed audio. Its dedicated bass restoration circuit reinjects deep bass information into your signal path, delivering a fuller, more powerful, and immersive listening experience across all music formats.

Precision Bass Shaping Controls

Take full control of your sound with dual rotary SWEEP and WIDE knobs. Adjust the center frequency between 27Hz and 63Hz and fine-tune the bandwidth of bass enhancement to perfectly match your vehicle’s acoustics and audio system setup for clean, controlled low-end performance.

High-Fidelity Signal Processing & Clean Output

With an ultra-wide 10Hz–35kHz frequency response, 133dB signal-to-noise ratio, and extremely low 0.0025% distortion, the STX851A ensures transparent, high-quality audio processing. Balanced RCA inputs with high voltage handling and strong noise rejection help eliminate engine whine and interference for a clean signal path.

Key Highlights

• Digital bass restoration circuit enhances low frequencies
• SWEEP control adjustable from 27Hz to 63Hz
• WIDE control for bass bandwidth shaping
• 133dB signal-to-noise ratio for ultra-clean audio
• 10Hz–35kHz wide frequency response
• Ultra-low 0.0025% total harmonic distortion
• Balanced RCA inputs up to 15V RMS handling
• Over 62dB noise rejection reduces interference
• Dash-mount remote with LED indicator included
• Built-in subsonic filter improves bass clarity
• Low 150mA power draw for efficient operation
• Inline design integrates before amplifier/crossover

What’s Included in the Package

• STX Audio STX851A Digital Bass Processor
• Dash-Mount Remote Control with LED Indicator
• Remote Cable
• Power/Signal Wiring Guide
• Mounting Hardware
• User Manual