Mark K's Speaker Pages
...when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the state of Science...Lord Kelvin
Another, not so brief update on the RS28A tweeter variability project.
Brian sent me 6 tweeters to evaluate. I'm showing numbers at 1k, 1.3k, 1.5k, and 2k, as well as FR curves for these six, labeled A-F.
The following graphs are arranged first , by frequency, then, by driver. They start at 1kHz and go up. At each frequency, you'll see six different drivers labeled A-F. Although, for unit B, I skipped some data points.
At 1kHz,
No unit B
Now, at 1.3kHz.
No Unit B
At 1.5kHz,
At 2kHz,
Conclusion
I think that samples A and E are the best, and easily go low. C and D are also good, and usable low. (How low is low? Depends on how loud you play. But I'd try A, C, D, or E between 1.3k and 1.5k. Unit F is fine at and above 1.5k. Unit B is a bit suspect-probably usable at 2k and above. Not up to my standards, though.