Gravity GR-HL2 2-Channel High-to-Low RCA Line Converter

The Gravity GR-HL2 is a 2-channel high-to-low RCA line converter for adding an aftermarket amplifier to a vehicle audio system with speaker-level outputs. It converts amplified speaker signals from a factory or aftermarket radio into low-level RCA signals for an amplifier input. This makes it useful when the existing radio does not provide RCA preamp outputs.

It is intended for installers and vehicle owners who want to retain the original radio while adding an amplifier or subwoofer system. The two-channel format suits basic stereo-to-amplifier and subwoofer-amplifier signal integration. Its compact format is designed to fit into an aftermarket audio installation without requiring a replacement head unit.

An adjustable attenuation control allows the output signal level to be matched to the connected amplifier. Proper level matching helps an installer set up the system with an appropriate signal level before amplifier gain adjustment. The control is located on the converter housing for accessible setup during installation.

The GR-HL2 includes an integrated ground-loop isolator intended to reduce unwanted electrical noise in the audio signal path. It also provides a 12V remote turn-on output for an amplifier. This can simplify amplifier activation in installations where a suitable remote lead is not otherwise available.

Use the GR-HL2 between the radio's speaker outputs and an amplifier's RCA inputs. It supports a straightforward upgrade path for adding amplified speakers or a subwoofer while maintaining the vehicle's existing radio and controls. A supplied wiring diagram provides connection guidance for the converter's integrated leads and RCA outputs.

Key Features

• 2-Channel Signal Conversion: Converts left and right speaker-level signals to RCA line-level outputs.
• Adjustable Attenuation: Lets the installer tailor converter output level for amplifier matching.
• 12V Remote Output: Provides a remote turn-on connection for a compatible amplifier.
• Ground-Loop Isolation: Helps address electrical hum and noise in the signal path.
• RCA Line Outputs: Connects to an amplifier using standard left and right RCA inputs.
• Wide Frequency Response: Covers a specified 10 Hz to 50 kHz range.

Design & Installation

The GR-HL2 uses a compact black enclosure with integrated wire leads, left and right RCA output connections, and an accessible level control. Its enclosure includes mounting tabs for securing the converter within an audio installation. The product layout identifies the input, power, ground, remote, and output connections.

Connect the converter's high-level input leads to the appropriate radio or speaker-output wiring, then run RCA cables from its outputs to the amplifier. Connect the power, ground, and remote-output leads as indicated in the supplied wiring diagram, and set attenuation during system tuning. Install it in a protected location and secure the housing so wiring is not strained or pinched.