Tips on How to Choose Your Stereo Power Amplifier

Sound is an incredible phenomenon. When something vibrates in the atmosphere, it moves the air particles around it. They in turn move the air particles around them, carrying the pulse of the vibration through the air. When our ears pick up these movements in air pressure, they translate them into electric signals the brain can process.

Electronic sound equipment works the same way and represents sound as a varying electric current. When a sound waves a microphone diaphragm back and forth, the microphone translates the movement into an electrical signal, which fluctuates to represent the compression and rarefactions of the sound wave. 

A recorder encodes the electric signal as a pattern as magnetic impulses on tape or as groves in a record, for instance. Then a player reinterprets the pattern as an electric signal and uses this electricity to move a speaker cone back and forth, which recreates the air pressure movements recorded by the microphone. This final step is more difficult and you need to boost the audio, so it will have a larger current while preserving the same pattern of charge fluctuation. And for that, you’ll need a stereo power amplifier.

Get a Better Sound with Hi-Fi Power Amplifiers

The spectrum of audio amplifiers is vast, however, when we refer to amplifiers, most of us are usually talking about stereo components or musical equipment. One of the best things a music lover can do to improve their sound when using speaker systems is to get a stereo power amplifier that will turn the low voltage signals from the source equipment into a signal with enough gain to be used to power a pair of speakers. Whether you like it soft or loud, extra power will breathe life into your music, bringing out all of its impact, emotional excitement and fine details. 

Most amplifiers appear to be complex, mysterious boxes, with many tiny pieces, but the basic operating principles are relatively simple. Every piece of the amplifier is important, but you don’t have to examine each one separately to see how an amplifier works. Stereo amplifiers have two output channels that they use to receive stereo output signal coming from the device (phone, player, etc.) and send the signal to the speakers that are connected to the amplifiers. 

Stereo power amplifiers are one of the most popular ways of improving sound quality in various situations and conditions. They have three ports, or connectors – input for connecting the signal source, outport for sending the signal to the speakers and power source connector, known as well as power input. 

Stereo amplifiers receive power from the wall socket and convert alternating current to the direct current thanks to the transistor. It’s a device that’s some kind of valve which enables the current to flow in a specific amount. The amount of current that the transistor lets flow always depends on the signal received from the signal source, whether it’s a TV, laptop, player, or else. The transistor controls the frequency of the current as well and depending on the frequency of the input signal, it will work slower or faster.

Choosing the Right HiFi Stereo Power Amplifier

When it comes to buying an amplifier, the most important thing is to make sure it matches perfectly with your speakers. There are three main things to consider before choosing your stereo amplifier, such as the following.

Power Output

It’s measured in watts (W) and it defines how loud your music will be. For a small apartment, 10W should be enough, but if you’re working with a large space, then you may want to consider 100W and more. 


It’s measured in ohms (Ohm) and ranges from 8 to 600 ohms. Impedance is referred to as electrical resistance as well and it shows the voltage you need for the best performance of the device you’re using. The higher the impedance of a speaker, the bigger voltage is needed, so the amplifier could make the speaker work.


It’s measured in decibels (dB) and shows how loud the speakers can get.


All input and output ports are in the rear panel. Based on the type and number of connections, you’ll know which devices you can use with the given model. Additionally, the rear panel shows if your amplifier supports upgrading.

Most stereo amplifiers have RCA inputs that can be connected to different types of players or other low-signal devices. Stereo amplifiers usually use an analogue connection, but these days modern amplifiers use digital connection and have some digital inputs. Some have USB ports as well, so you can connect your amp to your laptop or phone easily.

Output ports can be used to connect some additional devices to the amp. So, you can connect your subwoofer separately and add some bass, connect headphones or two pairs of speakers to one amplifier at the same time. However, keep in mind that the last one may result in poor performance. Lastly, many modern amplifiers have built-in Bluetooth, so you can connect them to your devices without any wires.