When it comes to an audio or integrated amplifier there are a lot many things that can influence one's choice. An audio amplifier is important equipment for those who want to amplify the low range audio waves or signals into a high range audio signal which can be heard through headphones or loudspeaker. For the first time buyers, specifications and several features of an integrated or a simple audio amplifier can be confusing, and thus one needs to be sure of the much-needed specifications which matters. Now, that one can make an informed and clear decision according to one's needs and requirements, certain features are listed below which one needs to keep in mind while buying one.
Total Harmonic Distortion
One should check the total harmonic distortion and inter-modulation distortion level of the audio amplifier before buying. One amplifier may give any one kind of distortion only. Having a THD means the unwanted signals will be given out at the output due to the harmonics and IMD means that the unwanted signals are present at the input and interference occurs at the output due to other elements like diodes.
Output
The next important thing is the output power of the amplifier, which means the amount of electrical power it can supply to the output speakers without any kind of damage. One should check the nominal power labeled which will be the value of the continuous power that will be supplied without any kind of damage or distortion.
Frequency
The frequency response is the relational response between the input and output level of the signals. Always check that the frequency response is between the audible band that is in between 20 and 20,000 Hz to get the best quality of the output.
Sensitivity
The sensitivity of the amplifier refers to the feature that states the minimum input signal that is needed to cause a maximum level of the output signal from the amplifier. Having a sensitivity which it is too high or too low can cause a lot of distortion in the output signals. Lower the value greater the sensitivity mentioned of the amplifier.
Impedance
Impedance is important to find the voltage adaptation between the amplifier and the sound source and one can find different impedance for different sources of audio input. Amplifiers tend to have both output and input impedance, and one should look out for a higher input impedance to get the proper voltage sourcing.
Gain
Next thing to check is the gain of the amplifier. It is a source of signal power between the output and the input power of the amplifier which is denoted in the form of decibels.
Signal to Noise
In amplifiers the higher signal to noise ratio will always enhance the output quality. It depicts the difference between the noise level and output level of the amplifier and sound level. It is the magnitude difference which is specified in hertz. Also one should find an amplifier which can amplify various types of audio sources and channels to prevent the crosstalk.
