How do I choose a power amplifier?
Quick answer
To choose a power amplifier, match its power rating (watts RMS) to your loudspeakers' continuous power handling, ensure impedance compatibility, and consider the amplifier's class (e.g., Class D for efficiency) and features like DSP or network control.
Start by checking your loudspeakers' continuous power handling (RMS) and nominal impedance (typically 4 or 8 ohms). The amplifier should deliver 1.5 to 2 times the speaker's RMS power at the same impedance for clean headroom without clipping. For example, a 500W RMS 8-ohm speaker pairs well with an 800–1000W amplifier into 8 ohms.
Impedance matching is critical: a 4-ohm load draws more current, so ensure the amplifier is rated for that impedance. Modern Class D amplifiers offer high efficiency and low weight, ideal for touring and installed systems. SSOUNDS amplifiers integrate DSP and network control for precise system tuning and monitoring.
Consider the application: for live sound, prioritize reliability, thermal management, and protection circuits. For installed systems, look for remote monitoring and energy efficiency. Always verify the amplifier's damping factor and signal-to-noise ratio for clean, controlled bass and low noise floor.
Key things to consider
- Match amplifier RMS power to 1.5–2x speaker RMS power at the same impedance.
- Ensure impedance compatibility (e.g., 4Ω, 8Ω) and check amplifier ratings for each channel.
- Choose Class D for portability and efficiency; Class AB for audiophile sound if weight is not an issue.
- Look for built-in DSP, network control, and protection features (thermal, short circuit, DC offset).
- Consider total system cost: amplifier power, features, and reliability over time.
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