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Welcome to the shack Denfred:T
for crossovers they work in octaves, like if you have a crossover thats 1st order that means that ever octave it will decrease in volume 6db, 2nd order is 12db and so on...
their are highpass bandpass and lowpass crossovers too, highpass means that every frequency above it is pretty much unaffected. Lowpass means that signals below it are unaffected. bandpass are basically both of those combined
ex: you have a 2nd order highpass crossover at 60hz. that means everything above 60 hz is unaffected but everything below it is effected. Since it is 2nd order that means it has a 12 db slope octave so that means at 30hz it will be 12 db quieter.

Now lets say you have a bandpass on a speaker. It is set at 60-2000hz 4th order, what this means is basically the speaker the bandpass is connected to will theoretically play 60-2000hz +/-0db(but in the real world this isn't true their is always going to be a fault) and every octave below and above that frequency will drop down 24db's.

"As I have read in many write ups, it is said to start at 80Hz or 10Hz above the speaker frequency range and tweak from there. I am very confused with the whole issue and do not know what to look for or where to start."

I don't know what you mean by this, but if you do have a cutoff at 150hz assuming that it is like a crossover it will do what I stated above.

if you need more help you can read this
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