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I know Jeff B. showed a quick and dirty preliminary test, but I figured I'd do the whole nine yards anyway and post my results here. It does indeed measure like an incredible tweeter, even more so considering the cost.
I just grabbed a piece of 1x8 pine I had lying around and routed out a small test baffle. I first consulted Jeff's Boundry and Diffraction simulator for the optimum position for flat on-axis measurement. The piece of pine is 7.25" wide and 13.5" tall. The center of the dome is exactly 2.5" from the top and 4" from the left side (in this image). This position yields a flat response, less than +/- 1db across the treble spectrum on-axis.
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2nd and 3rd order is just as clean as Jeff's quick and dirty test. I added three voltages here to show how it scales. It looks good for a very low crossover considering the small size of the dome. If you weren't worried about extreme SPLs, I could see a steep crossover as low at 1800. The critical thing I see from the sharp incline of the distortion below 1500 hz is that you'd want the tweeter response down 20 db or more at 1 khz (at the minimum).
How about the off-axis?
Damn near perfect out to 30 degrees, terrific. The odd changes in response here are due to the offset of the tweeter on the small baffle. You can see the 2 to 3khz get a baffle boost as we move off-axis and a ripple form above that. Even with all that considered, the tweeter on this baffle is performing awesomely.
Hands down, this looks like a great tweeter at 50$ and an unbelievable buy at 18$. All that is left now is to listen and confirm...
I just grabbed a piece of 1x8 pine I had lying around and routed out a small test baffle. I first consulted Jeff's Boundry and Diffraction simulator for the optimum position for flat on-axis measurement. The piece of pine is 7.25" wide and 13.5" tall. The center of the dome is exactly 2.5" from the top and 4" from the left side (in this image). This position yields a flat response, less than +/- 1db across the treble spectrum on-axis.
-
2nd and 3rd order is just as clean as Jeff's quick and dirty test. I added three voltages here to show how it scales. It looks good for a very low crossover considering the small size of the dome. If you weren't worried about extreme SPLs, I could see a steep crossover as low at 1800. The critical thing I see from the sharp incline of the distortion below 1500 hz is that you'd want the tweeter response down 20 db or more at 1 khz (at the minimum).
How about the off-axis?
Damn near perfect out to 30 degrees, terrific. The odd changes in response here are due to the offset of the tweeter on the small baffle. You can see the 2 to 3khz get a baffle boost as we move off-axis and a ripple form above that. Even with all that considered, the tweeter on this baffle is performing awesomely.
Hands down, this looks like a great tweeter at 50$ and an unbelievable buy at 18$. All that is left now is to listen and confirm...
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