Glossary

Car Audio and Vehicle Integration Glossary

Car audio terms can make a simple upgrade sound complicated, and product pages rarely stop to explain them. This glossary defines the vocabulary you will actually run into while shopping for an amplifier, a CarPlay kit, a camera, or a throttle controller. Every definition is written for a first time buyer, so you can skim the letter you need and get back to choosing your upgrade.

How to use this car audio terms index

Click a letter to jump to that section. We only list letters that contain terms, and every entry stands on its own, so there is no required reading order. If a word you ran into is missing, email us and we will add it.

A

Amplifier

The component that takes a low power audio signal and gives it the muscle to drive speakers. Factory amplifiers are usually built to a cost target, which is why music sounds thin or muddy at volume. A dedicated amplifier restores clean power, and our Encore amplifier kits add one to Toyota and Lexus vehicles without cutting a single wire.

ANC (Active Noise Cancellation)

A factory system that plays inverted sound through the speakers to cancel engine drone in the cabin. It works fine with the stock audio path, but after an amplifier or stereo upgrade its correction signal becomes audible interference. That is why ANC needs to be disconnected during many upgrades.

Android Auto

Google's system for projecting phone apps like Maps, Spotify, and messaging onto a vehicle screen. It is the Android counterpart to Apple CarPlay, and many retrofit kits support both from the same hardware.

Anytime Camera

A camera setup you can view on demand while driving, not just in reverse. Typically used with a front camera so you can check curbs, parking blocks, and cross traffic hidden by a tall hood. The camera image appears on the factory screen at the press of a switch.

Apple CarPlay

Apple's system for running iPhone apps on a vehicle display, with Siri voice control. Vehicles that never shipped with it can often gain it through a retrofit kit that works with the factory screen.

Aux Input

A simple analog audio input, usually a 3.5mm jack, that lets an external device play through the vehicle speakers. It carries sound only, with no screen integration or control features.

B

Backup Camera Interface

A module that lets a camera display on a factory screen that was never wired for one, or adds camera inputs beyond what the vehicle shipped with. It handles the video signal conversion and tells the screen when to switch to the camera view.

C

CAN Bus

The internal network modern vehicles use so their computers can talk to each other. Speed, gear position, ignition state, and hundreds of other signals travel on it. Well designed integration products read the CAN bus rather than splicing into individual wires, which keeps installs clean and reversible.

Channel

One independent output path on an amplifier. Each channel powers a speaker or a group of speakers, so the channel count tells you how many separate signals an amp can drive. More channels generally means finer control over the sound in different parts of the cabin.

Class AB Amplifier

An amplifier design known for smooth, natural sound, favored for clarity in the midrange and highs. It trades some electrical efficiency for that character. Many enthusiasts consider it the classic sound quality choice.

Crossover

A circuit that splits audio into frequency ranges and sends each range to the speaker best suited for it, so tweeters get highs and subwoofers get lows. Sending the wrong frequencies to a speaker wastes power and can damage it, which is what a crossover prevents.

D

DSP (Digital Signal Processor)

A chip that shapes audio digitally before amplification, adjusting timing, frequency balance, and volume per channel to suit your specific cabin. It is the difference between raw power and tuned sound. Our Encore X amplifiers build DSP in, tuned with our desktop software on a Windows PC over USB, and each kit ships with an in-house tune so most owners never open the software. Our article on what DSP does in car audio explains it in depth.

E

Encore Series

Beat-Sonic's family of plug and play amplifier kits for Toyota, Lexus, Subaru, Chevrolet, Ford, Mazda, Nissan, and Honda vehicles. Encore Alpha covers straightforward amplification, with ENA-3 models adding a subwoofer output. Encore X adds DSP, tuned with our desktop software on a Windows PC and shipped with an in-house tune already loaded, and Encore Sigma is the newest platform built for newer Lexus models.

F

Factory Harness

The original wiring loom the manufacturer installed in your vehicle. Plug and play products connect to it using matching connectors instead of cutting into it, which preserves the vehicle wiring exactly as it left the factory.

Fisheye Lens

An ultra wide camera lens that captures a very broad view at the cost of some curvature at the edges of the image. On a front camera, that width is the whole point, because it lets you see cross traffic approaching from both sides at once.

Front Camera Interface

The module that connects a front camera to a factory screen and lets you call up its image on demand. Ours pair an interface, such as the CS11A for select Lexus screens or the CS15 for select 2022 and newer Toyota screens, with a wide angle camera. Browse the combinations in our camera solutions collection.

H

Head Unit

The main stereo control unit in the dash, sometimes just called the radio or receiver. It is the source of the audio signal and usually the screen for phone projection. Integration products are designed to work with the factory head unit rather than replace it.

High Level Input

An amplifier input designed to accept speaker level signal directly from a factory head unit or factory amp. It lets an aftermarket amplifier connect to systems that have no dedicated low level outputs, which is the normal situation in a modern Toyota or Lexus.

L

Line Output Converter (LOC)

A device that converts speaker level signal from a factory system down to the low level signal an aftermarket amplifier expects. It is the traditional bridge between stock head units and added amps. Integrated amp kits build this conversion in, so a separate LOC is often unnecessary.

O

OEM

Original Equipment Manufacturer, meaning the company that built the vehicle or its factory installed parts. In upgrade conversations, OEM describes anything that came with the car from the factory, as opposed to aftermarket parts added later. OEM integration means adding features while keeping the factory look and controls.

P

Plug and Play

An install approach where every connection uses factory matching connectors, so nothing gets cut, spliced, or soldered. The honest test of the term is reversibility: a true plug and play product can be removed later with the vehicle returned exactly to stock. Every Beat-Sonic kit is built to that standard.

R

RCA Output

A standard low level audio connection, recognizable by its round push on plugs, used to send clean signal between components such as a processor and an amplifier. Low level signal through RCA cables picks up less distortion than speaker level signal along the way.

Retrofit

Adding a feature to a vehicle that did not ship with it, using parts designed to integrate with the existing equipment. Adding wireless CarPlay to a 2015 Lexus with its original screen is a retrofit. Done well, the result looks and works like it came from the factory.

S

S-Connect

Beat-Sonic USA's line of wireless CarPlay and Android Auto retrofit kits that work with the factory screen while keeping the backup camera and steering wheel controls. The Lexus S-Connect line is approved by Lexus USA, and every S-Connect kit routes all audio through the factory Bluetooth by design and carries a 3 year warranty. See the full range in our CarPlay and Android Auto collection.

ShiftPower

Beat-Sonic USA's plug and play throttle response controller. It installs at the accelerator pedal connector, offers multiple drive modes, and covers over 3,000 vehicle applications. ShiftPower carries a 3 year warranty. Find the model for your vehicle in the ShiftPower collection.

Sound Deadening

Material applied to door skins and panels to stop vibration and block road noise. It quiets rattles, tightens bass, and makes every other audio upgrade sound better. Our sound deadening kits are cut for specific vehicles so installation is straightforward.

Steering Wheel Controls (SWC)

The buttons on the steering wheel for volume, track skip, and voice commands. A common worry with retrofits is losing them, and it is a fair worry with generic parts. Vehicle specific integration kits are designed to keep steering wheel controls working exactly as before.

Subwoofer

A speaker dedicated to low bass frequencies that regular door speakers cannot reproduce with authority. Adding one fills in the bottom of the music rather than just making it louder. Amp kits with a subwoofer output, like our ENA-3 models, make the addition simple. The ENA-3 subwoofer outputs are line level, so pair them with a powered subwoofer, or a passive sub plus a separate amplifier.

T

THD (Total Harmonic Distortion)

A measurement of how much an audio component alters the signal passing through it, expressed as a percentage. Lower is cleaner. You will see it on amplifier spec sheets as a shorthand for how faithfully the amp reproduces what it was given.

Throttle Response Controller

A device that adjusts how quickly the engine responds to your accelerator pedal input by refining the pedal signal. It does not add horsepower, it removes the sluggish feeling factory pedal mapping creates. Our article on what a throttle controller does covers it honestly, including what it will not do.

V

Video in Motion (VIM)

A modification that allows video playback on a vehicle screen while the vehicle is moving, which factory systems normally block. It is mainly used so passengers can watch content on the road. Read our explainer on what Video in Motion is before deciding if it fits how you use your vehicle.

W

Wireless CarPlay Adapter

A device that adds wireless CarPlay capability to a vehicle, either by converting an existing wired connection or by retrofitting CarPlay onto a factory screen that never had it. Vehicle specific kits keep the factory screen, backup camera, and steering wheel controls in the process.