Gravity

Gravity GR-HL4 4-Channel Car Audio Line Converter - RCA Output

3.5 (9 reviews)

Enhance Your Car Audio with the Gravity GR-HL4 Line Converter Seamlessly integrate aftermarket amplifiers into your factory audio system with the Gravity GR-HL4. This 4-channel line converter provides adjustable signal sensitivity and a built-in remote turn-on for hassle-free installation. Speci...

$19.99*
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

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Overview

Enhance Your Car Audio with the Gravity GR-HL4 Line Converter

Seamlessly integrate aftermarket amplifiers into your factory audio system with the Gravity GR-HL4. This 4-channel line converter provides adjustable signal sensitivity and a built-in remote turn-on for hassle-free installation.

Specifications:

  • Channels: 4 Input and Output
  • Input Signal Sensitivity: Adjustable
  • Remote Turn-on: Built-in 12V Output
  • Ground Loop Isolator: Built-in
  • Frequency Response: 10Hz - 50kHz
  • Power Supply: 11-15V DC neg. ground
  • Max Input: 100W
  • Input Impedance: 15K ohms
  • THD: 0.03%

Key Features

☞【Purpose】 High-frequency speaker output will be converted to low-frequency RCA output, connect the car amplifier subwoofer signal input

☞ 【For Car CD, VCD, DVD】100% Brand new high to low converter, used for car CD VCD DVD player without low frequency RCA output

☞ 【Adjustable Attenuation】Provide the level gain adjustment. Use the adjustment rotate button, you can adjust the bass down without having to pull over and manually adjust the input level of the amplifier to the minimal one, very convenience

☞ 【RCA Function High to Low】The Converter allows you to get RCA line level outputs from your high-level output device. It also can convert the high-voltage signal output of the amplifier or speaker to the low-voltage signal, improve sound quality

☞ 【Simple to Install】Wiring diagram is attached on the back of the package, our line converter car audio is convenient to install

Specifications

Channels
4-Channel
Input Type
High-frequency speaker output
Output Type
Low-frequency RCA output
Adjustment
Level gain adjustment (attenuation)
Purpose
Connect car amplifier subwoofer signal input
Compatibility
Car CD, VCD, DVD players without low frequency RCA output

Pros & Cons

👍 Pros

  • Effectively converts high-frequency speaker output to low-frequency RCA output, enabling connection to car amplifiers and subwoofers.
  • Specifically designed for car CD, VCD, and DVD players that lack a low-frequency RCA output, expanding audio system compatibility.
  • Features an adjustable attenuation control, allowing you to fine-tune the bass level without manually adjusting the amplifier.
  • Improves sound quality by converting high-voltage signals from amplifiers or speakers to low-voltage signals, reducing distortion.
  • Simple to install with a wiring diagram conveniently attached to the back of the package, ensuring a straightforward setup process.
  • Supports a 4-channel setup, providing versatility for connecting multiple speakers or amplifiers within your car audio system.

👎 Cons

  • Requires installation, which may involve wiring and basic automotive audio knowledge, potentially challenging for novices.
  • Specific maximum input wattage or voltage capacity is not provided, which could be a concern for very high-power car audio systems.
  • The adjustment rotate button for bass control, while convenient, does not specify the range of attenuation it provides.
  • No information on the unit's dimensions or mounting options is provided, which could impact placement in tight car interiors.
  • The product primarily serves to convert signals, and does not itself add amplification or complex sound processing features.

Frequently Asked Questions

The main purpose of the Gravity GR-HL4 is to convert high-frequency speaker output into low-frequency RCA output, allowing you to connect it to your car amplifier or subwoofer's signal input.
Yes, it is specifically designed for car CD, VCD, and DVD players that do not have a low-frequency RCA output, making them compatible with amplifiers.
Yes, it provides a level gain adjustment through a rotate button, allowing you to conveniently adjust the bass down without needing to manually adjust your amplifier's input level.
The converter works by converting the high-voltage signal output from an amplifier or speaker to a low-voltage signal, which can help improve overall sound quality before reaching your amplifier.
No, it is designed to be simple to install, and a wiring diagram is conveniently attached to the back of the package to guide you through the process.