Question 1

How do I calculate the required amplifier power for my speakers?

Accepted Answer

The calculator uses the formula: P = 10^((SPL - Sensitivity - 20×log₁₀(distance))/10). It considers speaker sensitivity, listening distance, target SPL, and adds headroom for dynamic peaks. Room acoustics are also factored in, as reverberant rooms require less power than anechoic spaces.

Question 2

What is speaker impedance and why does it matter?

Accepted Answer

Speaker impedance (in ohms) determines how much current the amplifier must supply. Lower impedance (4Ω) draws more current than higher impedance (8Ω). When connecting multiple speakers, impedances combine - speakers in parallel reduce total impedance, while series connections increase it. Amplifiers must be rated for the final load impedance.

Question 3

What's the difference between Class A, AB, and D amplifiers?

Accepted Answer

Class A offers highest fidelity but low efficiency (20-30%). Class AB balances quality and efficiency (50-70%), common in studio monitors. Class D achieves 85-95% efficiency, ideal for high-power applications and portable systems. The calculator recommends the best class based on your application and priorities.

Question 4

How much headroom do I need in my amplifier?

Accepted Answer

Headroom prevents clipping during dynamic peaks. For music, 3-6dB headroom is typical. Live sound benefits from 6-10dB. Critical listening and studio monitoring may need 10dB+. The calculator factors your desired headroom into power recommendations.

Power Amplifier Calculator

Amplifier Power & Compatibility

Speaker Specifications

Performance Requirements

Calculated Power Requirements

Frequently Asked Questions

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