GR-HL4

Clean Signal Conversion for Factory and Aftermarket Systems

The Gravity GR-HL4 4-Channel High to Low RCA Line Converter is designed to integrate aftermarket amplifiers into factory or non-RCA car audio systems. It converts high-level speaker signals into clean low-level RCA outputs, allowing seamless connection to amplifiers and subwoofers without replacing the head unit. This makes it an ideal solution for upgrading sound systems while keeping factory radios intact.

Engineered for clarity and stability, the GR-HL4 ensures accurate signal transfer so your amplifier receives a clean and consistent audio input. The result is improved sound performance, stronger output, and better overall system balance.

Built-In Remote Turn-On and Ground Loop Isolation

The GR-HL4 includes a built-in 12V remote turn-on output, eliminating the need for separate wiring solutions when activating your amplifier. This simplifies installation and ensures synchronized power-up behavior between your head unit and amplifier system.

A built-in ground loop isolator helps reduce unwanted noise, such as alternator whine or electrical interference, ensuring cleaner audio output. This makes the GR-HL4 especially effective in complex or factory-installed electrical systems where noise issues are common.

Adjustable Control for Flexible Audio Tuning

With adjustable input sensitivity, the GR-HL4 allows users to fine-tune signal levels for optimal amplifier performance. The rotary gain control makes it easy to match output levels without complicated setup procedures, ensuring proper bass response and balanced audio output.

Its compact design allows for easy installation in tight spaces, while the 4-channel configuration supports full-range audio systems. Whether used for upgrading speakers or adding subwoofers, the GR-HL4 provides reliable performance and simple integration.

Highlights

• 4-channel high to low RCA line converter
• Converts speaker-level signal to RCA output
• Compatible with factory and aftermarket radios
• Built-in 12V remote turn-on output
• Integrated ground loop isolator for noise reduction
• Adjustable input signal sensitivity control
• Supports clean connection to amplifiers
• Improves overall sound clarity and output
• Frequency response range 10Hz to 50kHz
• Handles up to 100W input per channel
• Low distortion (0.03% THD) signal conversion
• 15K ohm input impedance for stable performance
• Compact design for easy installation
• Ideal for subwoofer and amplifier integration
• Simple wiring with included installation diagram

Package Contains

• Gravity GR-HL4 4-Channel Line Output Converter
• Wiring Harness
• Installation Guide / Wiring Diagram
• Mounting Accessories
• User Manual