A pop or crackles appears in one tweeter at 50hz test tones and the few test tones below that.
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50 hz for a tweeter? I don't think so.. unless you wired direct from an amp, with no XO.. The reason a speaker uses a crossover is to stop exactly what you're hearing.. If you're hearing it BELOW that you need to check out what is going on there.
60 hz and below is sub
60-250hz is bass
250-2500 mids
2500 up is tweeter or highs..
It sounds like you have a crossover problem. If you do, you might have a driver problem too.
NO sound should be coming from drivers other than what the driver XO point have been set at..
So noise from the tweet, while doing low pass sweeps, is just as bad as 5k sweeps coming through the bass drivers...
Something is wrong.. look at wiring from the binding post to the XO give it the smell and a good visual. Go from there.. 50hz signals getting through to a tweeter is not good though.. Snap, Crackle, POP, come to mind..
Regards