online speaker building calculators ..

[Kannan_madhu]

Came across an interesting page
mh-audio.nl - Calculations

Crossover design with out measurements
Introduction to designing crossovers without measurement - diyAudio

 

[Kannan_madhu]

some more
Speakerbuilder Pro 2.0

 

[Kannan_madhu]

Inductor Designer / Calculator
Inductor Designer / Calculator
Capacitor serial and parallel value calculator.
Electronics 2000 | Series / Parallel Capacitor Calculator