waterfall of full range and AMT tweeter, what does the "build up" in the hi frq mean?

im using a series capacitor as hi pass filter for the AMT tweeter. what does the buildup means? how can i improve it?
the measurement is taken from my listening position. no acoustic treatment, open baffle full range speakers.
thanks

1662617301996.png
 
Last edited:
It means something rings. First i suggest that you make sure it really is a tweeter and not mid.
Measure each driver separately please.
It could be mid breakups ringing. Or tweeter crossed too low, and needs higher fr crossover, or just steeper slope. One cap in series plus inductor parallel in tweeter. I bet you get incressed distortion in that spot too.
 
  • Like
Reactions: dudwity
It means something rings. First i suggest that you make sure it really is a tweeter and not mid.
Measure each driver separately please.
It could be mid breakups ringing. Or tweeter crossed too low, and needs higher fr crossover, or just steeper slope. One cap in series plus inductor parallel in tweeter. I bet you get incressed distortion in that spot too.
thank you, i will separate the speaker and tweeter response and check where the ringing is and aluminate it.
 
It looks like a measurement error to me or the software cannot interpret what happens. I cannot think of anything physical with non-decaying sustain, followed by a sudden drop-off, which only happens at high frequencies.

Thinking out loud:
I think that the software that generates the waterfall plot can only handle decaying sound. If you measure at the listening position, this is not necessarily what happens. It appears that the direct sound hits the microphone [time 0], decays, after which reflected sound hits the microphone [time 160]. The software registers that the level has increased and assumes something went wrong, so all earlier data in the plot [before time 160] is lifted to the same magnitude.
 
Last edited:
  • Like
Reactions: youknowyou