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#1 |
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diyAudio Member
Join Date: Jan 2002
Location: Puget Sound
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#2 |
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diyAudio Member
Join Date: Jun 2002
Location: USA, MN
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caused by phase wrapping from time of flight, you need to remove time of flight - not sure how it's done with sound easy.
__________________
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan |
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#3 |
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diyAudio Member
Join Date: Jan 2002
Location: Puget Sound
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I thought I had been doing this but I'll go back and recheck.
Thanks! |
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#4 | |
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diyAudio Member
Join Date: May 2002
Location: Switzerland
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Quote:
What you see here is some sort of lobing. I assume that this software assumes the drivers being point-sources. Am I right with my guess ? Regards Charles |
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#5 |
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diyAudio Member
Join Date: Jan 2002
Location: Puget Sound
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I didn't know the cause of the problem at the time so playing with xyz values on the order of 10's of mm did not have an appreciable effect.
The ripples shifted their relative positions but remained within the crossover region. Maybe if I had added a meter to the z position, the ripples would have been largely eliminated. I carefully went back over the SPL measurement steps last night and I no longer have ripples. |
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#6 |
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diyAudio Member
Join Date: Aug 2004
Location: US
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Quote:
__________________
John k.... Music and Design NaO Dipole Loudspeakers. |
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#7 |
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diyAudio Member
Join Date: Jan 2002
Location: Puget Sound
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I'll keep that in mind. That was a straw man to see if I could get SoundEasy to show a summed response.
Still have a ways to go before I feel confident enough to order the parts. |
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#8 |
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diyAudio Member
Join Date: Jan 2002
Location: Puget Sound
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Here's an attempt at a 3rd order butterworth targeted at 2500Hz.
I'm stuck at this point and need to get a way from the keyboard for a while. I did the following to get to this point:
I've run out of tricks, not that I had any to start with. Attached are individual and summed with both tweeter polarities. One problem I've run into is that if I try to use the optimize function on the T component which is my active 2nd order high pass, SoundEasy locks up. I'm preferring to ignore this for the time being.
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#9 |
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diyAudio Member
Join Date: Jan 2002
Location: Puget Sound
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Getting closer. Now I get a nice null when I reverse the polarity.
Spent some time away from this and went skiing yesterday. Didn't think about it all day. But before hitting the sack I had a little bit of inspiration. I tried to use the optimizer in a more focused manner. For example, the parallel trap was optimized separately from the HP 2nd order LR. Optimizing each function separately seems to be the trick. Can anyone characterize what I have so far? I'm a little elevated above 6k. Playing around this morning, I can definitely do a better job of taming that region. I understand that it's give and take but I'm not sure what shape to aim for. Next on my list is to go back over the active sections. I might move the parallel trap to active and I want to see if I can combine the first and third active elements.
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