{"product_id":"gravity-gr-hl4-4-channel-high-to-low-rca-line-converter","title":"Gravity GR-HL4 4-Channel High-to-Low RCA Line Converter","description":"\u003cp\u003eThe Gravity GR-HL4 is a four-channel line output converter for adding an aftermarket amplifier to a vehicle audio system that does not provide RCA preamp outputs. It accepts speaker-level audio from a factory or aftermarket radio and converts it to low-level RCA signal. This allows an amplifier to be connected while retaining the existing head unit.\u003c\/p\u003e\u003cp\u003eThis converter is intended for installers and vehicle owners upgrading factory audio systems with amplified speakers, an external amplifier, or a subwoofer amplifier. Its four-channel design supports connection from multiple speaker outputs rather than limiting the system to a single stereo pair. RCA outputs provide a conventional signal connection for compatible aftermarket amplifiers.\u003c\/p\u003e\u003cp\u003eThe GR-HL4 is designed to provide a controlled signal handoff between a radio's speaker wiring and an amplifier's RCA inputs. Adjustable input signal sensitivity helps match the converter's output level to the connected amplifier. Proper level adjustment can help create a balanced system setup without unnecessarily overdriving the amplifier input.\u003c\/p\u003e\u003cp\u003eA built-in 12-volt remote turn-on output is included for amplifier activation in installations where the radio may not provide a dedicated remote lead. The converter also incorporates a ground loop isolator intended to help reduce unwanted electrical noise in the audio signal path. These integrated functions can reduce the number of separate interface components needed for a basic amplifier integration.\u003c\/p\u003e\u003cp\u003eThe compact GR-HL4 is suited to installations where a factory radio is being retained and an amplifier is added downstream. It operates from a 12-volt negative-ground vehicle electrical system and accepts up to 100 watts of input per channel. Use it as part of a properly fused amplifier installation with suitable RCA cables, speaker-wire connections, and amplifier power wiring.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-Channel Conversion:\u003c\/strong\u003e Converts four speaker-level channels to RCA-level audio outputs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRCA Line Outputs:\u003c\/strong\u003e Connects compatible aftermarket amplifiers using standard RCA signal cables.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Sensitivity:\u003c\/strong\u003e Lets the installer set signal level for the connected amplifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemote Turn-On Output:\u003c\/strong\u003e Provides a 12-volt trigger output for amplifier activation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Loop Isolator:\u003c\/strong\u003e Helps reduce electrical noise transferred through the signal path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Frequency Response:\u003c\/strong\u003e Supports audio signals from 10 Hz to 50 kHz.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesign \u0026amp; Installation\u003c\/h3\u003e\u003cp\u003eThe GR-HL4 uses a compact enclosed design intended for integration into vehicle audio wiring. Its RCA interface, level adjustment control, and integrated remote-output function place the primary connection and setup functions in one converter module. The design is made for negative-ground automotive electrical systems operating between 11 and 15 volts DC.\u003c\/p\u003e\u003cp\u003eInstall the converter between the radio's speaker-level outputs and the RCA inputs of a compatible amplifier, following the wiring diagram supplied on the package. Connect the amplifier's remote terminal to the converter's remote turn-on output when applicable, then set input sensitivity conservatively before final system tuning. Confirm speaker-wire polarity, secure all wiring, and keep signal wiring routed appropriately for the vehicle installation.\u003c\/p\u003e","brand":"Gravity","offers":[{"title":"Default Title","offer_id":45613358579782,"sku":"GR-HL4","price":17.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0048\/4163\/5910\/files\/71umOhE1FzL.jpg?v=1784350611","url":"https:\/\/audiowatt.store\/products\/gravity-gr-hl4-4-channel-high-to-low-rca-line-converter","provider":"Audio Watt Store","version":"1.0","type":"link"}