What is a car amplifier?
A car amplifier is used to supply the car’s speakers or subwoofers with more power than the car stereo’s built-in amplifier can normally deliver.
The amplifier receives the audio signal from the car stereo or a digital signal processor (DSP), amplifies it and sends it to the speakers.
With a correctly sized amplifier, you can play louder with less risk of distortion and gain better control over the speakers. This makes it an important component in many upgraded car audio systems.
What types of amplifiers are available?
Amplifiers have different numbers of channels depending on the speakers they are intended to drive.
Monoblock (single-channel amplifier): Mainly used to drive one or more subwoofers.
Two-channel amplifier: Usually used to drive a pair of speakers or a component speaker system with passive crossovers. Some models can also be bridged to drive a subwoofer.
Four-channel amplifier: Can drive front and rear speakers, for example, or two front speakers together with a bridged subwoofer.
Multichannel amplifier: Has five or more channels and can drive multiple speakers and subwoofers from the same amplifier.
Amplifiers with a built-in DSP are also available, allowing adjustment of crossovers, time alignment and equalizer settings, for example.
What should I consider when choosing an amplifier?
The most important thing is to choose an amplifier that suits the speakers and how the audio system will be used.
In particular, check:
RMS power: How much continuous power the amplifier can deliver at a specified impedance.
Impedance (ohms): The amplifier must be able to handle the load presented by the connected speakers.
Number of channels: Determines how many speakers or speaker groups you can drive.
Crossovers: Many amplifiers have built-in filters to adapt the frequency range to the speakers.
Power supply: The amplifier needs correctly sized power cables, a fuse and a ground connection.
Most amplifiers for passenger cars are intended for 12-volt electrical systems. Vehicles with 24-volt systems, such as some lorries, require equipment designed for this or a suitable voltage converter.
Do I need an amplifier for my car audio?
Not always. If you only want to replace the car’s factory speakers, the car stereo’s built-in amplifier may be sufficient.
However, if you want to play louder, drive more power-hungry speakers or install a passive subwoofer enclosure, a separate amplifier is often a good option.
Need help choosing the right amplifier? Contact our customer service team or visit one of our stores for advice.