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In Reply to: RE: Tweeter Alignment Results posted by jcmusic on August 11, 2014 at 16:26:48
Hi
Measuring is the best way to arrive at the optimal result.
If you can, get a copy of ARTA or other low cost measuring software and a half decent measurement microphone.Fwiw, impulse response and step response are actually poor ways to judge this, the acoustic phase (phase once the fixed time delay has been accounted for) is the best view as it shows the relationship to the input signal or between the upper and lower frequency range.
The impulse and step response emphasizes the HF response portion and makes the LF hard to see.
Best,
Tom Danley
Danley Sound Labs
Edits: 08/12/14Follow Ups:
Let me clear the air some, yes I am using a different tweeter that's why the huge difference in the two plots. As for alignment I used RTA with the polarity fliped on the tweeter to create a null or peak at the xover point while playing that frequency with a generator. Hope that explains it better.
Hi
The problem with not including time (which an RTA does not) is that one will get a null (with polarity flipped) every 360 degrees of phase rotation. In other words, the measurement will have a null if you are in the correct time but also every wavelength (360 degrees of phase error) as the sources are 1,2,3 etc wavelengths either ahead or behind in time as well.
Since some music is very “time variant” and not a continuous signal, one can have what appears to be a correct alignment with an RTA but in reality be off by one or more wavelengths with one source being far ahead or behind in time.
Best,
Tom
Thanks Tom I plan on remeasuring this weekend using impulse with a time reference.
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