Speaker Crossover Calculator (1st/2nd Order)
From driver impedance and crossover frequency, get the woofer series inductor / shunt capacitor and tweeter series capacitor / shunt inductor, with one-click first/second order and standard Q values.
Key points
Speaker Crossover Calculator (1st/2nd Order): From driver impedance and crossover frequency, get the woofer series inductor / shunt capacitor and tweeter series capacitor / shunt inductor, with one-click first/second order and standard Q values. Formula: 2nd order: C = Q/(2πf_c·R) ｜ L = R/(2πf_c·Q) ｜ 1st order: L = R/(2πf_c), C = 1/(2πf_c·R). Enter parameters on the DD-CAT IDE online tool page to get results instantly, with a calculation-model diagram that updates with the inputs. The acoustic phase of woofer and tweeter must line up at the crossover; second-order networks usually need the tweeter inverted or you get a deep notch. Driver impedance near the crossover is not the nominal 8Ω (peaks of 10–20Ω are common); use an impedance curve for accurate work.
Inputs
2nd order: C = Q/(2πf_c·R) ｜ L = R/(2πf_c·Q) ｜ 1st order: L = R/(2πf_c), C = 1/(2πf_c·R)Calculation model (updates with parameters)
| Woofer: series inductor L | 720.4 µH | In series with the woofer |
| Woofer: shunt capacitor C | 5.626 µF | Across the woofer |
| Tweeter: series capacitor C | 5.626 µF | In series with the tweeter; also blocks DC |
| Tweeter: shunt inductor L | 720.4 µH | Across the tweeter |
| Woofer slope | -12 dB/oct | Q = 0.707 |
| Attenuation at crossover | -6.0 dB（sums out of phase — invert polarity） | |
| Inductor selection | 720.4 µH 空心/铁芯Inductance，Current ≥ 2.5A | Estimated at 50W — size it to your amplifier |
Engineering notes
- The acoustic phase of woofer and tweeter must line up at the crossover; second-order networks usually need the tweeter inverted or you get a deep notch.
- Driver impedance near the crossover is not the nominal 8Ω (peaks of 10–20Ω are common); use an impedance curve for accurate work.
FAQ
- What is Speaker Crossover Calculator (1st/2nd Order) for?
- From driver impedance and crossover frequency, get the woofer series inductor / shunt capacitor and tweeter series capacitor / shunt inductor, with one-click first/second order and standard Q values.
- What is the formula for Speaker Crossover Calculator (1st/2nd Order)?
- Core formula: 2nd order: C = Q/(2πf_c·R) ｜ L = R/(2πf_c·Q) ｜ 1st order: L = R/(2πf_c), C = 1/(2πf_c·R). The tool returns results instantly using this formula and the selected parameters.
- What engineering notes should I keep in mind when using Speaker Crossover Calculator (1st/2nd Order)?
- The acoustic phase of woofer and tweeter must line up at the crossover; second-order networks usually need the tweeter inverted or you get a deep notch. Driver impedance near the crossover is not the nominal 8Ω (peaks of 10–20Ω are common); use an impedance curve for accurate work.