How do I choose a power amplifier?
Quick answer
Choose a power amplifier by matching its power rating (watts per channel at the load impedance) to your loudspeakers' continuous and peak handling, ensuring the amplifier can deliver clean headroom without clipping.
Selecting a power amplifier starts with understanding your loudspeakers' impedance (typically 4 or 8 ohms) and power handling (continuous and peak). The amplifier should deliver 1.5 to 2 times the loudspeaker's continuous power rating at the same impedance to provide headroom and avoid clipping, which can damage drivers. For example, if your speaker handles 500W continuous at 8 ohms, choose an amplifier rated 750–1000W per channel into 8 ohms.
Consider the amplifier's topology: Class D is efficient and lightweight, ideal for portable systems; Class AB offers lower distortion but higher heat. Also check damping factor (higher is better for tight bass control), signal-to-noise ratio (above 100 dB for clean output), and protection features (thermal, short-circuit, DC offset). For large-scale PA, look for amplifiers with DSP and network control for system tuning and monitoring.
SSOUNDS amplifiers are engineered to pair seamlessly with our loudspeakers, offering optimized presets, high damping factors, and robust protection. For touring or installed systems, we recommend amplifiers that deliver consistent power across all channels and can drive low-impedance loads without sagging. Always verify the amplifier can handle the total load when running multiple speakers per channel (e.g., 2 x 8 ohm speakers = 4 ohm load).
Key things to consider
- Match amplifier power to speaker continuous rating with 1.5–2x headroom at the same impedance.
- Choose Class D for portability and efficiency; Class AB for lower distortion in fixed installs.
- Prioritize high damping factor (>200) for tight bass and low distortion.
- Ensure protection features (thermal, short-circuit, DC) and adequate cooling for sustained use.
- For multi-speaker setups, calculate total impedance and verify amplifier stability at that load.
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