Customer service: Mon.–Sat. • 9:30 a.m.–12 p.m. / 1:30 p.m.–6 p.m. • 09 85 13 66 35
Auto-Connect
ISO-ISO connection with 2-channel high-low level converter
Auto-Connect
Automatic ISO-ISO connection with 4-channel high-low level converter
Add an amplifier or powered subwoofer to a factory car stereo using our high-to-low level converters, speaker-to-RCA adapters, High/Low interfaces, and noise filters for car audio installations.
A high-to-low level converter, also known as a speaker-to-RCA converter or High/Low converter, allows you to use the speaker outputs of a car stereo to obtain a signal suitable for a compatible low-level RCA input.
Many factory car stereos do not have RCA outputs. A High/Low converter can therefore capture a high-level signal from the speaker outputs to adapt it for the installation of a compatible amplifier or subwoofer.
When the car stereo does not have a pre-amplified RCA output, a high-to-low level converter can provide the signal needed to integrate an external amplifier.
The converter can also be used to capture the signal needed to install a mono amplifier or powered subwoofer while keeping the factory car stereo.
In modern vehicles, replacing the car stereo can be complicated due to integrated controls, screens, or functions. A High/Low interface often makes it possible to work with the existing system.
High/Low converters are used in many audio upgrade projects to integrate external amplification without completely modifying the original source.
The converter receives a high-level signal from the speaker circuit and then provides a low-level signal usable by compatible equipment. Depending on the product, additional features may be available: level adjustment, remote output, automatic detection, or Plug & Play integration. Check the specifications of each model.
Designed to directly capture one or more speaker signals and then provide low-level outputs for audio installation.
Some interfaces use ISO connections to simplify integration into compatible installations and minimize wiring harness modifications.
Some models are designed to make connection easier thanks to suitable connectors. It remains essential to check their compatibility with the vehicle and audio system.
The most advanced solutions may include additional signal processing to better meet the needs of an audio installation using an original source.
The collection also includes RCA noise filters and ground isolation solutions. They can be used in certain installations experiencing parasitic noise, but it is preferable to first identify the source of the problem: grounding, cable routing, power supply, RCA connection or potential difference.
A whistle or noise that changes with engine speed may have several causes. Before adding a filter, check the grounding, connections, RCA cables, and power cable routing. The filter is a suitable solution for certain situations, but it does not replace a proper diagnosis.
The right model depends on the original audio system, the number of channels to capture, and the equipment you wish to add. On some amplified or complex OEM systems, a specific interface may be necessary.
Unsure about your vehicle? Contact Sound Auto Concept with the vehicle model and year and the original audio system to determine the most suitable solution.
Speaker-to-RCA converters are particularly useful when the goal is to keep the factory car stereo and controls while adding external amplification, a subwoofer or a higher-performance audio system.
Discover Auto-Connect, Hifonics, Mosconi / Gladen, Ground Zero, Focal, ESX, Musway, MTX Audio, Reiss Audio, and other brands designed for integrating amplifiers into car audio systems at Sound Auto Concept.
It converts a high-level signal from a speaker output into a low-level signal usable by a compatible RCA input.
One solution is to use a High/Low converter connected to the speaker outputs to provide the signal needed by the amplifier.
Yes, in many installations. A speaker-to-RCA converter can capture the signal needed by a compatible amplifier or active subwoofer.
A high-level input generally receives a signal from speaker outputs, while an RCA input is designed for a pre-amplified low-level signal.
Not necessarily. If the amplifier has a high-level input compatible with the vehicle's signal, it can sometimes receive the speaker outputs directly without an external converter.
It depends on the number of signals you wish to capture. Two channels may be sufficient for some installations, while a multi-channel system may require four channels or more.
It can help reduce certain parasitic noise present on an audio connection, particularly in certain situations related to ground potential differences.
Possible causes include grounding, cable routing, RCA connections, power supply, or other electrical issues. It is preferable to search for the cause before installing a noise filter.
No. Modern audio systems may use factory amplification, filtered signals, or particular architectures. You must check compatibility with the vehicle and the audio system before choosing the interface.
Discover the Ground Zero Iridium range, combining German expertise, performance, and excellent value for money. Speakers, subwoofers, active and passive subwoofers, amplifiers: everything you need to improve your car's sound...
Sound Auto Concept will be present at the Show Team Oldschool Tuning Act #4 on April 17 and 18, 2027, in Bessan. Visit our 90 m² multi-brand car audio stand...
Sound Auto Concept will be present at the Roussillon Motors Show 2026, on November 14 and 15 at the Circuit du Roussillon in Rivesaltes. Come and see our Show Car...
Discover Reiss Audio at Sound Auto Concept: SPL subwoofers up to 5000 W RMS, high-power amplifiers, midbass, tweeters, and accessories for your car audio installations.
Discover the Ground Zero GZCS 20SUB-ACT 20 cm (8"), ideal for utility vehicles and small cabins, and the GZCS 25SUB-ACT 25 cm (10"), designed for standard vehicles seeking more bass....
Deaf Bonce unveils its new generation of DB subwoofers. From the 3500W RMS DB-3.5K to the monstrous 7500W RMS DB-7.5K Neo, discover a range designed for high-power car audio, SQL,...