Soundstream BX-LOC4 is a bass processor and integration for an aftermarket vehicle audio installation. Match the specifications, connections and mounting requirements below to your system before ordering.

• Brand: Soundstream
• Manufacturer part number: BX-LOC4

Features and installation details

Maximize your system’s performance with the Soundstream BX-LOC4 — an all-in-one digital bass restoration processor and 4-channel line output converter designed for seamless integration with OEM or aftermarket head units. Whether you're upgrading a factory system or enhancing a custom build, the BX-LOC4 ensures your music hits harder and cleaner, delivering rich low-end impact and full-range output flexibility.

This advanced processor restores and enhances low frequencies that are often lost in compressed music or factory sound systems. With a variable 27Hz–63Hz bass frequency sweep and adjustable center Q/width, you can fine-tune your bass response with pinpoint accuracy. A dash-mounted remote control allows for real-time bass level adjustments, subsonic crossover tuning (35Hz–80Hz), and provides an easy-to-read display for voltage monitoring, subsonic frequency, and output level.

Supporting both speaker-level and RCA inputs, the BX-LOC4 offers four full-range RCA outputs and dedicated subwoofer RCA outputs, making it the ideal hub for connecting amplifiers in complex multi-channel systems. With selectable impedance matching, audio signal-sensing turn-on, and a built-in LED clipping indicator, the BX-LOC4 is built for powerful, reliable performance in any setup.

4-Channel Speaker-Level Input for OEM Integration

4-Channel RCA Input for Aftermarket Head Units

4-Channel Full-Range RCA Output + 2-Channel Subwoofer Output

Digital Bass Processor with Variable Frequency (27Hz–63Hz) & Q/Width Control

Dash-Mount Remote Displays Voltage, Subsonic Frequency, and Bass Level

Subsonic Filter Range: 35Hz–80Hz

Selectable Signal Sensing or Direct Turn-On

Impedance Matching for Speaker & Low-Level Input Sources

Onboard LED Clipping Indicator for System Protection

Dimensions: 8" (L) x 4" (D) x 1.25" (H)

More from Soundstream

Explore these related options. Compare specifications and vehicle fitment when choosing an alternative or planning an installation.

• Soundstream BX-LOC2 | Digital Bass Reconstruction Processor with 2-Channel Line Output Converter
• Soundstream BX-LOC1 | Digital Bass Reconstruction Processor with Line Output Converter
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