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Speaker Internals.

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In bookshelf and larger speaker enclosures that include a crossover circuit, I have noticed that the main large driver is wired correctly to the crossover terminals + to + and - to -. BUT, the tweeter or horn has been wired in reverse + to - and - to +. Why is this so? I do not consider this to be a mistake.

Z.

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    only identical, or harmonically related frequencies can be described as having a fixed phase relationship.

    Unrelated frequencies have a phase difference that changes continually over time, generally only returning to the same state after the time that is the lowest common multiple of the two cycle periods - so if say 400Hz and 500Hz are in phase at some instant 't' then they will not be again until 4 whole cycles of the 500Hz have passed, the  same as 5 whole cycles of the 400Hz. So the cyclostationary period is the difference frequency, in this case a 100Hz beat note.) As frequencies get really close, they approach a zero beat - in radio this is a common method to verify that the frequency is 'spot on', as zooming in to zero beat can be done by ear.

    this video shows it rather well on an oscilloscope (after about 1min introduction )

    Mike.

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  • 0

    only identical, or harmonically related frequencies can be described as having a fixed phase relationship.

    Unrelated frequencies have a phase difference that changes continually over time, generally only returning to the same state after the time that is the lowest common multiple of the two cycle periods - so if say 400Hz and 500Hz are in phase at some instant 't' then they will not be again until 4 whole cycles of the 500Hz have passed, the  same as 5 whole cycles of the 400Hz. So the cyclostationary period is the difference frequency, in this case a 100Hz beat note.) As frequencies get really close, they approach a zero beat - in radio this is a common method to verify that the frequency is 'spot on', as zooming in to zero beat can be done by ear.

    this video shows it rather well on an oscilloscope (after about 1min introduction )

    Mike.

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