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Power amplifiers are the backbone of every PA system. They provide the energy and headroom needed for live sound, events and installations. Here you’ll find everything you need to know before choosing the right model.
For compact setups, active speakers with built-in amplifiers are often enough. But for professional sound systems and larger events, dedicated power amplifiers are essential.
Main advantages of separate amplifiers:
Most models are designed as 2-channel or 4-channel units. Many modern amps also include DSP features such as EQ, delay, crossover and limiter. Typical connections: SpeakON outputs, plus XLR, 1/4" jack or RCA inputs.
Popular manufacturers: Behringer, Crown, Dynacord, Fame Audio, Monacor, Yamaha
Amplifiers are divided into different classes. For PA and pro audio, the most relevant are Class AB, Class H and Class D.
Class A: excellent audio quality, but inefficient. Class B: efficient, but with more distortion. Class AB: a balance of quality and efficiency. Class H: an advanced AB design. Class D: compact, lightweight and extremely efficient – now the standard in professional power amps.
The key question: how much wattage is needed? It depends on the venue and the event. Rule of thumb: it’s better to have more power than not enough – you can always turn down a strong system, but you can’t push a weak one harder.
Typical ranges:
Tip: Match amplifier power to your speakers. A 2000 W amp won’t help if your speakers can’t handle the load.
Switch-mode power supplies are lighter, more compact and more efficient. Conventional linear supplies are cheaper, but heavier and less practical in professional environments.
Power amps generate heat, so cooling is essential. Common methods:
For reliability in professional use, active fan cooling is strongly recommended.
Tip: Clean dust filters regularly to maintain airflow and prevent overheating.
Good amplifiers include built-in protection against common issues:
