In general, the audio system includes:
1. Input
2. Process
- pre-amp
- driver amp
- power amp
3. Output
Pre-Amp >> Driver Amp >> Power Amp
1. Pre-Amp (Initial Amplifier)
This amplifier is used to amplify the signal coming from the transducer, this amplifier has high input sensitivity or it can be said that to get a large output voltage only a small input voltage is needed, usually in micro Volts, this pre-amplifier has different characteristics, depending on its use. Example of a mic amplifier; has a flat frequency response characteristic along the audio frequency spectrum, while for a pick-up amplifier it has a characteristic that its gain decreases with increasing frequency. More about how the Pre-Amp works can be seen HERE .
Devices that can fill this section are Transducers, Media Players or Music Instruments.
2. Driver Amp (Driver Amplifier)
Usually a power amplifier requires a high input voltage, therefore before the final amplifier is installed, a driving amplifier is installed in front of it, with the aim of being a buffer amplifier between the final amplifier and the initial amplifier.
- Equalizer = is an electronic device that functions to influence the high and low tones in an amplifier circuit. This tool can eliminate and bring up a frequency response according to the operator's wishes.
- Mixer = is an electronic device that functions to mix audio signals from several sources.
3. Power Amplifier (Final Amplifier)
It is a tool that can increase or strengthen audio signals so that they can vibrate the speaker membrane. This device is usually the final amplifier in an audio system.