> For a long time it has been virtually impossible to find a I've been curious about the Vifa D26NC55 tweeter for some time, not for the Advents, look at the clean CSD plot for it: It is also interesting to look at the distortion in the 3 to 10 kHz range since this is the main pass band of the tweeter. I recently noticed that the SEAS 27TFFC is higher than most in efficiency and this makes it a good choice for the Advent IMO, would have to investigate further. Second and third harmonic distortion can be seen in green and blue here: Note the Scan Speak 9500 as a top performer and the XT or DX in comarision, note also the SEAS 27TDFC as a resonably priced top performer: There are a few people with web sites offering measurements of driver distortion. Many designers like to push the XO frequency as low as possible and therefore pay a lot of attention to distortion in the 1 to 2 kHz range. The original Advent tweeter was also more efficient than most, and it has a DC resistance of about 4 ohms and an Fs of 650 to 750 Hz, wouldn't hurt to go a bit higher for lower excursion, IMO. Few 1" domes are designed or used down to 1 kHz. It's not just a matter of matching Fs, the replacement must have enough displacement limited output to support the 1 kHz XO. I'm always keeping an eye out for a replacement but one issue is that
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