[ei-ha]

A PA (Public Address) amplifier is designed to deliver sound over a large area, often outdoors, and is capable of producing high sound levels. It is usually built into a heavy-duty cabinet and has a high power output.

A Hi-Fi (High Fidelity) amplifier, on the other hand, is designed for home use to deliver high-quality sound for music and is typically less powerful than a PA amplifier. It has a more refined sound quality and is often used in stereo systems.