The Tone Stack calculator is designed to help you check out the design and response curves of a variety of tone stacks used in popular guitar amplifiers.

Software: 

SpeakerBox Filter Designer is a simple and useful software for calculate the first and second order passive audio filter for 2 way and 3 way speaker box .
Speaker Box Filter Designer audio filter calculator is a very simple program that provide a simple calculations of values for all components used in passive audio filters for speakers .
Also with this audio filter calculator software you can calculate the numbers of turns required by coils used in audio filters .

Given the power output of the amp, it will work out the total impedance that the amp "sees", and will work out the individual power within each speaker. It has pictures of the different configurations within the spreadsheet, so you can use these as a reference for wiring the speakers .