For those interested in removing the HF breakup peak on a 25 - 28mm Ti dome tweeter, here are a few calculations I've made to accomplish this. You can get very close to the actual shape of the peak with a very simple filter.
I've tried this notch filter with my Audax TW025A28 Ti domes and it works very well. Looking at the 16 dB+ peak at 25.5k, its not a bad idea to try taming this dog whistle of a peak. You can vary the peak amplitude by changing the parallel resistor. In my case, 33R is the value that worked best. I used my Earthworks measurement mic to verify this which is flat to 30k.
A trained ear can definitely hear a difference with recordings that have extension past 20k, mainly classical and acoustic music. It passes the "triangle test" and also playing cymbals.
I've tried this notch filter with my Audax TW025A28 Ti domes and it works very well. Looking at the 16 dB+ peak at 25.5k, its not a bad idea to try taming this dog whistle of a peak. You can vary the peak amplitude by changing the parallel resistor. In my case, 33R is the value that worked best. I used my Earthworks measurement mic to verify this which is flat to 30k.
A trained ear can definitely hear a difference with recordings that have extension past 20k, mainly classical and acoustic music. It passes the "triangle test" and also playing cymbals.
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Yes, the true benefit of this is a reduction in down modulated HD components, which can wreak havoc on overall THD. Just like a really live sounding metal cone driver, it will cause side band components which are easily distinguished from standard in band breakup modes. A good example of this sort of driver is the Seas W15CY, as it has a similar single sharp breakup mode, which can be heard even with a crossover slope attenuating by 24 or more dB.
I made measurements which I couldn't capture due to the setup itself. I use a gated spectrum analyzer which doesn't have a means to export a graph or data. Pulling out the PC to do this is a massive hassle for me, mainly because the other setup is always ready to go and uses a compact display based on Android. Sorry
