Amplifiers are the heart of any sound system: they receive weak signals and transform them into powerful signals capable of moving speakers and filling spaces with clarity. But not all amplifiers are created equal. Depending on their technology, number of channels, or type of installation, they can be adapted to small environments or large-scale distributed systems.
This section explains the key concepts that define how amplifiers work and how to choose them: from the difference between low and high impedance, to what it means for an amplifier to be Class D or multi-channel.
Amplifying isn't just about turning up the volume: it's about doing it with efficiency, precision, and control.
What is high impedance or 100V line?
It is a system that allows many loudspeakers to be connected in parallel using transformers, both at the amplifier and at the loudspeakers. The signal is transmitted at 100 volts to avoid losses over long distances.
Ideal for large buildings such as hospitals, airports, or shopping centers, where sound needs to be distributed across multiple zones.
What does low impedance mean in an audio system?
It is a configuration in which loudspeakers are connected directly to the amplifier without transformers, typically with impedances of 4, 6, or 8 ohms.
It is used in installations with few speakers and short distances, such as event rooms, studios, or home systems.
What is a Class D amplifier?
It is a type of amplifier that operates by switching, not linearly. Instead of amplifying the signal directly, it converts it into pulses (PWM) which are then filtered to recover the audio.
They are highly efficient, generate little heat, and take up less space. Ideal for high-power installations or those with energy constraints.
What does it mean for an amplifier to be multichannel?
It means it has several independent outputs, each with its own amplification. It can power different zones, speakers, or functions from a single unit.
It allows zone-based sound control, mixing sources, or integrating music and announcements in the same installation.