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How to Tweak the Maximum Performance of Your Audio Amplifier

How to Tweak the Maximum Performance of Your Audio Amplifier

The performance of audio amplifiers is limited by several factors. I will take a look at some of these factors and explain how we can maximize performance of your amplifier.

First of all, the power supply voltage has a major impact on the amplifier output that should swing. Let’s imagine the output terminal as being connected to two MOSFET transistors. The amplifier internally can either open one or the other MOSFET thus connecting the output terminal to either a positive or negative voltage supply rail. If the amplifier is powered by AC voltage, typically the amplifier will work with a positive and negative voltage. As an example, the amplifier might be using + and -50 volts. As a result, the voltage can swing within this range.

Using this 100 V range, you can easily drive speakers even with higher impedance such as 8 ohms speakers. However, some amplifiers especially many amplifiers unlimited in their output voltage swing because they typically use a fairly low power supply voltage. Some models use an external wallwart. This wallwart might only give 12 or 24 V. Therefore, there is no …