Crossover Frequency Quick Reference
Illustration in preparation Description: Visual guide showing speaker types on left, recommended crossover ranges as colored bars spanning the frequency axis, with notes on slope at each transition
Recommended crossover points:
| Transition | Typical Range | Slope | Notes |
|---|---|---|---|
| Sub → Midbass | 60–100 Hz | 24 dB/oct | 80 Hz most common (THX standard) |
| Sub subsonic filter | 15–25 Hz | 24 dB/oct minimum | Below box tuning for ported |
| Midbass → Midrange | 200–500 Hz | 12–24 dB/oct | Depends on driver capabilities |
| Midrange → Tweeter | 2000–5000 Hz | 12–24 dB/oct | Check tweeter Fs; cross at min 2× Fs |
Rules for tweeter crossover:
- Minimum: 2–3× tweeter Fs (e.g., Fs = 800 Hz → minimum 1,600–2,400 Hz crossover)
- Recommended: 2,500–4,000 Hz for most quality tweeters
- Slope: 12 dB/octave minimum; 24 dB/octave for better protection
Related DSP Reference
- Audio Levels, Metering, and Headroom for the house wording around dB references, peak language, and comparable measurements.
- Reading DSP Levels, Q, and Headroom for the number-reading workflow that should come before crossover fine tuning.
- Q and Bandwidth Converter for filter-width interpretation once the crossover point is chosen.