BillFitzmaurice.info

Bill Fitzmaurice wrote:No more narrow than that of the midbasses. If you're going to have a line source then it should be a line source across the entire spectrum. If you're going to have a point source it should be a point source across the entire spectrum. As for the piezo response at 2kHz, there should not have been any. The piezo high pass filter in the plans has a 3.5kHz knee.

The peak was definitely in the original design. If I can find the original measurements I'll post them and compare them w/ the measurements using the new tweeter.

So in layman's terms, where are you saying sound would or should be negatively effected because I went w/ this different tweeter? I originally considered using 4 of the tweeters, but wanted to try one and see how it measured and it seems decent.

mattsk8 wrote: I originally considered using 4 of the tweeters, but wanted to try one and see how it measured and it seems decent.

I'm going to assume your measurement was axial. That would not reveal the huge difference in the vertical dispersion pattern of the midbasses versus the tweeter. Four tweeters would reduce that difference, and get the vertical pattern control in the highs necessary in a reverberant space. Wired as series/parallel pairs you would keep the impedance the same, allowing the use of the same high pass, though that's a question mark, as that should have been 3.5kHz, not 2kHz.

Bill Fitzmaurice wrote:I'm going to assume your measurement was axial. That would not reveal the huge difference in the vertical dispersion pattern of the midbasses versus the tweeter. Four tweeters would reduce that difference, and get the vertical pattern control in the highs necessary in a reverberant space. Wired as series/parallel pairs you would keep the impedance the same, allowing the use of the same high pass, though that's a question mark, as that should have been 3.5kHz, not 2kHz.

This was my mistake, like I said earlier we measured these about a year ago; the peak was at 5k, not 2k. Here's the graph from the crossed over tweeter's measurement. And no, we measure more than on axis.



What I have sounds good. This tweeter acts more like a super tweeter anyhow. I'm going to run it, I'll post measurements once its all installed.