Speaker Sound Q Calculator

Loudspeaker Total Q Factor Estimator

Input Fields

Resonant Frequency

f₀

Hz

Center (resonant) frequency of the speaker

Lower -3dB Frequency

f₁

Hz

Lower frequency at -3 dB point

Upper -3dB Frequency

f₂

Hz

Upper frequency at -3 dB point

CalculateReset

Calculate automaticallyIf enabled, the result will update automatically when you change any value.

Your Results

Q Factor

Leave a Comment

How did this result make you feel?

0😀 Like 0💡 Helpful 0😕 Confused 0😞 Disappointed 0❌ Inaccurate

Speaker Q Factor Formula

$$Q_{ts} = \frac{Q_{ms} \cdot Q_{es}}{Q_{ms} + Q_{es}}$$

Where:

• $$Q_{ts}$$ = total (system) Q factor
• $$Q_{ms}$$ = mechanical Q factor
• $$Q_{es}$$ = electrical Q factor

This formula gives the total Q factor, which affects the speaker’s transient response and low-frequency roll-off.

Speaker Sound Q – Calculation Example

Given:

• $$Q_{ms}$$ = 5.5
• $$Q_{es}$$ = 0.5

Calculation:

1. $$Q_{ts} = \frac{5.5 \cdot 0.5}{5.5 + 0.5} = \frac{2.75}{6} ≈ 0.458$$

The total Q factor (Qts) is a critical parameter in loudspeaker design. It combines electrical damping from the voice coil (Qes) and mechanical damping from the suspension (Qms). A lower Qts typically results in tighter bass response, while higher values yield more resonant, looser bass. This calculator helps designers and audio engineers quickly evaluate driver behavior to match it with suitable enclosures like sealed or vented boxes.