Thank you for the suggestions. Yes, I agree, this is a very serious problem, as the ear is very sensitive in this frequency range.
I tested the speaker with the crossover and the woofer completely disconnected, with only a 50uF protection cap in series with the tweeter. The dip remains the same.
So it seems that this is being caused by some type of reflection from the baffle or woofer flange. Tomorrow, I will cut up a series of foam or felt strips and stick them along the edge of the woofer flange to see if that makes a difference.
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The SideTowers - An F6 Corundum Build
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Originally posted by AdamM3 View PostThat dip appears to coincide with a peak in the woofers response on your xover sim pic, I would have to agree with wolf.
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Originally posted by 4thtry View PostHere are a few measurements. Polars look good. Z curve looks like an easy load for amp. Well balanced sound as I move about the room, stand, or sit down. BSC seems about right so far, need to compare it to some other speakers before making adjustments.
Note that the tweeter's on-axis FR has a dip at 4.6kHz that completely disappears when you move slightly off-axis in either direction. Very strange. It is not caused by the protective screen or xover, as I get the same dip with or without the screen or xover installed. 4.6kHz has a half wavelength of roughly 1.5". I have a guess as to what is happening here, but will need to run a few more tests to see if I am on the right track.
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Originally posted by 4thtry View Post
Thanks, Craig. Just trying to boost my originally score by doing something a bit different, should I take them to MWAF next year.
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Originally posted by 4thtry View PostHere are a few measurements. Polars look good. Z curve looks like an easy load for amp. Well balanced sound as I move about the room, stand, or sit down. BSC seems about right so far, need to compare it to some other speakers before making adjustments.
Note that the tweeter's on-axis FR has a dip at 4.6kHz that completely disappears when you move slightly off-axis in either direction. Very strange. It is not caused by the protective screen or xover, as I get the same dip with or without the screen or xover installed. 4.6kHz has a half wavelength of roughly 1.5". I have a guess as to what is happening here, but will need to run a few more tests to see if I am on the right track.
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Here are a few measurements. Polars look good. Z curve looks like an easy load for amp. Well balanced sound as I move about the room, stand, or sit down. BSC seems about right so far, need to compare it to some other speakers before making adjustments.
Note that the tweeter's on-axis FR has a dip at 4.6kHz that completely disappears when you move slightly off-axis in either direction. Very strange. It is not caused by the protective screen or xover, as I get the same dip with or without the screen or xover installed. 4.6kHz has a half wavelength of roughly 1.5". I have a guess as to what is happening here, but will need to run a few more tests to see if I am on the right track.
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Originally posted by AdamM3 View PostAre they stable on those stands, looks like a lot of overhang. Cool unique design.
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Originally posted by ugly woofer View PostNice driver combo. I vote for veneering the edges with something contrasting, and yeah it would be really difficult with the existing vinyl.
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Originally posted by carlthess40 View PostWhere would you place these and how do they sound? Is it more of a rear or side speakers for a HT setup or a 2.0 setup and have them on with sides of the main wall? Very cool build with a lot of questions
For placement, I have given them the full 6dB of BSC. I plan to place them well out into the room, at least 3 feet away from rear and side walls. I am not designing them to be placed at the sides of a HT setup. Well out into the room is a must. Not on the sides of the main wall either.
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Originally posted by wogg View Post
Plus you still get some boundary low end reinforcement from the rear port! That might be genius.
Bill 4thtry , you seem to be on a mission to minimize your baffles with your totally flat and this project. At some point I see you magically fabricating a single theoretical point source
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Originally posted by donradick View Post
Inspiring design and build as usual!
I've spent some hours in HornResp, but certainly I'm not an accomplished ML-TL modeler.
What's that "LA TL" program? Got a link?
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Originally posted by Wolf View PostI think Bill is mandating room position, as you can't place them any closer to the front wall of the room.
However, I wonder what they would sound like and how they would perform in an upfiring Omni situ like Duevel's Planets.
Later,
Wolf
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