Crossmith: Speaker Crossover

Crossmith designs passive speaker crossovers the way the desktop tools do, on your phone. Textbook calculators assume every driver is a plain resistor; Crossmith solves every capacitor, coil and resistor against each driver's real impedance and shows what the speaker will actually do. Every feature is free: no subscription, no account, works offline. SIMULATION, NOT JUST FORMULAS - Summed response with phase: each driver's output through its network, added with polarity, driver depth and height, at your listening distance - Impedance the amplifier sees, phase, group delay - Baffle step from your baffle width - Tolerance band: what 5 % capacitors and 2 % coils do to your build - Crossover point, phase match, flatness, lowest impedance and warnings in plain words DESIGN IN MINUTES - 1-way, 2-way, 2.5-way and 3-way projects - Butterworth, Linkwitz-Riley, Bessel or your own Q, 1st to 4th order (6 to 24 dB/oct) - Values designed into each driver's impedance at the crossover, not a nominal 8 ohms - Suggested crossover range from the drivers' limits - Zobel, resonance trap, L-pad and baffle-step networks in one tap - The tweeter is aligned automatically: polarity and a small stagger chosen for the flattest sum TUNE IT LIKE ON THE BENCH - Every network drawn as a schematic, from the amplifier to the driver - Tap a part, type a value (4,7 uF, 0.62 mH, 3.3 ohm) or drag its slider and watch the response move - Any impedance, decimals too: 3.2, 5.5, 16 ohm, whatever your drivers are - Coil resistance (DCR) included YOUR DRIVERS - Start from data-sheet parameters (Re, Le, Fs, Qms, Qes, Vas, box) - Import FRD and ZMA measurements from REW, ARTA or a graph tracer; minimum phase rebuilt when needed BUILD IT - Parts list with standard values (E12 / E24) and the best parallel pairs - Resistor wattage and capacitor voltage for your amplifier power - Build sheet as a PDF, parts list as CSV ALSO - Calculators: crossover values, Zobel, resonance trap, L-pad, baffle step, standard values - Light and dark themes, English, Spanish, Portuguese, German and Italian - Backup and restore to a file - Ads are kept off the editor; one optional purchase removes them Made by Fernhart Labs, makers of Boxsmith (subwoofer box design).