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Power amplifiers are the heart of any PA system: they deliver the energy and volume needed for live events. Here’s what to consider before buying.
For smaller setups, active speakers with built-in amps are common. But when it comes to larger events, dedicated power amps are the better choice.
Benefits of separate power amps:
Most units are 2-channel or 4-channel models. Some include built-in DSP (EQ, delay, crossover, limiter). Typical connections are SpeakON for outputs and XLR, 1/4" jack or RCA for inputs.
Top brands: Behringer, Crown, Dynacord, Fame Audio, Monacor, Yamaha
Amplifiers are divided into classes. In pro audio, Class AB, Class H, and Class D are most relevant.
Class A: top sound, low efficiency. Class B: efficient, but distortion-prone. Class AB: balanced mix of sound and efficiency. Class H: refined version of AB. Class D: digital, ultra-efficient, compact, lightweight – now the industry standard for touring rigs.
The classic question: how many watts do you need? It depends on venue size and style of music. Better too much power than not enough: you can always turn it down, but you can’t push an underpowered amp harder without distortion or damage.
Guidelines:
Tip: Match amp power to your speakers. A 2000 W amp is pointless if the speakers can’t handle it.
Switch-mode power supplies (SMPS) are lighter, smaller, and more efficient – the go-to choice for modern pro amps. Linear supplies are cheaper but heavier and less practical for touring rigs.
Amps produce heat. To ensure long-term reliability, proper cooling is crucial:
Active cooling is the pro standard, especially for touring and club installs.
Tip: Clean dust filters regularly to keep airflow strong.
Good power amps come with safety circuits to prevent damage:
