The power amplifier is the last link in the sound reproduction chain before the speakers and quite a power pack of the sound reproduction system. With the help of a separate power amplifier, you can build very robust sound reproduction equipment. In our selection, you can find plenty of power amplifiers of different prices, different sizes and different powers, from more sensitive devices to more powerful ones. However, power amplifiers do not have, for example, a volume control, but a separate one is needed for this preamplifier. Our selection also includes subwoofer amplifiers and others to home speakers connectable home hi-fi devices.
But what is a power amplifier? What types of amplifiers are available? And how to choose the right Terminal Amplifiers for your needs?
What is a power amplifier?
A power amplifier is an amplifier that takes a line-level signal, such as a signal coming from a preamplifier, and amplifies it strong enough to be fed to speakers. When we talk about hi-fi systems, the importance of the power amplifier is irreplaceable. It determines the volume and detail of the sound you hear.
Different types of amplifiers
Stereo amplifier: As the name suggests, the stereo amplifier is designed for two-channel sound reproduction – left and right. This is the most typical amplifier in home stereos.
Subwoofer amplifier: A specialized power amplifier designed especially for bass speakers or subwoofers. It focuses on boosting low frequencies.
Tuner amplifier: A combined amplifier that contains both a radio receiver and an amplifier in the same device. Typically nowadays in home theater amplifiers.
Preamplifier: A preamplifier is a device that takes a weak audio signal from the source and amplifies its level before sending the signal to the final amplifier. It also enables selection of sound sources and often volume control. A preamplifier is often needed with active speakers.
Amplifier for the car: As the name suggests, these amplifiers are specially designed for car audio systems. They are often small and durable.
Power amplifiers specifications can vary significantly, but here are some general points you should consider:
Power: How strongly can terminal amplifiers amplify a signal.
Compatibility: Make sure that the power amplifier you choose is compatible with your other hi-fi equipment and speakers. What is the impedance of the power amp and speakers?
Connectivity: What kind of connection does the power amplifier support? With which connectors is the rest of your system connected - Does the signal come balanced or unbalanced? What cables do you need?
How to choose a power amplifier?
When choosing a power amplifier, it is important to think about the intended use. If you need an amplifier for your car, make sure it is compatible with your car's system and has enough power. A home stereo amplifier is the most common choice, but if you want deep and powerful bass, you need either an active subwoofer or a separate subwoofer amplifier and subwoofer.
The choice of amplifier is also influenced by the budget, but it is important to remember that a high price does not always mean the best quality. Do background research, read reviews and ask for expert advice.
It is also important to think about how the power amplifier integrates with other devices. For example, if you already have a preamplifier, make sure the new amp is compatible with it. Likewise, if you plan to upgrade your entire hi-fi system in the future, choose a power amplifier that is flexible and compatible with a variety of devices.
Power amplifier and impedance
Impedance is an electrical resistance that describes how much resistance a device, such as a power amplifier or a speaker, places on an electric current. In a power amplifier, impedance is one of the most important technical characteristics, because it defines how the amplifier is able to work with different speakers.
When talking about the compatibility of the power amplifier and the speakers, it is important to look at the impedance of both. In an ideal situation, the output impedance of the power amplifier is the same as the impedance of the speakers, so that the amplifier and speakers work optimally. Impedance mismatch can lead to at least disturbances in the sound of the speakers.
It is critical to ensure that the impedance of the power amplifier and the impedance of the speakers are matched. If the impedance of the speaker is too low compared to the impedance of the amplifier, it can cause the amplifier to be overloaded and even damaged. Similarly, if the impedance of the speaker is significantly higher than that of the amplifier, the sound quality and volume may suffer.
Many modern power amplifiers are designed to work with several different impedances, which makes it easier to choose a suitable pair of speakers. When choosing a power amplifier, it's a good idea to check the manufacturer's recommendations and make sure that the speakers and Power Amplifiers are impedance-matched.
Choosing a power amplifier is all about personal preferences and needs. Whether it's listening to music, watching movies or improving your car's audio, the right power amplifier can make a significant difference in the quality of your sound.