Just be sure to read the "Features/Comments" section to see what filters were in place for the distortion measurements. It can be a bit misleading because it appears (to me) that the filters were not in place for the frequency response measurements. So there isn't a one to one match between the frequency response and distortion measurements.
Jesús María what a tweeter
I thought it was the GRT-145 at first..
Still, as I mentioned here with respect to the GRT-145:
Some speaker driver measurements...
Basically get that right (waveguide) for the SRT-7, get production costs pretty low, and sell the crap out of them to the pro market - which is a MUCH larger market. A lot of compression drivers would be left sitting on the shelves with that solution.
I think these were originally targeted for a November release. Do you have any additional information on when the T25 line will be available?
The measurements of the BlieSMa T25D-6 Diamond dome tweeter have been added:
BlieSMa T25D-6 | HiFiCompass
BlieSMa T25D-6 | HiFiCompass
Are you doing listening sessions to the tweeters as well or only measurements ?
Both T25B and T25D have splendid behavior, but I think the T25B is the overall winner in this battle. CSD measures a tad better for the T25B as well.
Usually, I prefer don't share my subjective impression. But I can say certainly that Al, Be, and D versions sound quite different and it is very good can be heard.
Indulge me, I am not going to judge you. I would very much like to hear your subjective findings between the Al/Be/D versions. What is the unique characteristics you found ?
Take the Accuton diamond vs Bowers&Wilkins diamond, very different beasts. The Accuton is forward and bright while B&W is laid back and relaxed.
Okay, will try to translate my listening impressions to letters on the next week
Obviously, not much has changed in 30 years of happy development ... at least THD-wise. Why that ???
BliesMa Beryllium vs. Scan-Speak D2509 99000
Attachments
That might be, but if nothing els, you are doing clever marketing..
. Looking at the frequency response, then things change. While harmonic content can be said to have matured years ago, the on- and off axis most certainly needed an update, and that is what we are getting with some of the newer tweeters.
Maybe I might be clever, thanks for that one, and you might be right in this term, maybe. But I don't intend to do any marketing at all. Here you are definitively wrong. I am simply comparing different drivers. And also I would most be interested in having the opportunity to compare multitone IM measurements, also.That might be, but if nothing els, you are doing clever marketing..
The brand nes Bliesma is certainly a nice driver and better than most other tweeters, but not overwhelmingly better. It's not a magnitude better in all terms, but slightly better in some terms compared e.g. to the (old man) SS:
Comparing both speakers in terms of frequency response, Bliesma is indeed smoother and extends this way from 1.2kHz to some 32kHz within +-2dB. This is really nice. Scan-Speak is slightly more irregular and within +-2B from 950Hz to 20kHz. +1 for Bliesma.
Comparing both speakers in terms of CD, again Bliesma is the winner.
But still, in the range around 2kHz, ScanSpeak is the clear winner (<50dB/0.31% for SS vs. <40dB/1% for BliesMa @ 5.6V input). And this is puzzling. After all these years of development, CAD and new materials, I am really disappointed that no driver is on market with less than 0.1% THD @ 96dB/1m troughout 1.5kHz to > 20kHz. Should be possible, though.
No marketing at all, then. Just comparing and hoping for the really, substantially better to come, yet.
And please include multitone IM measurements.
@Daihedz:
It's not puzzling at all. You are comparing a waveguided tweeter with regular one. Bliesma is smaller so CTC distance will be smaller also, unlike SS. Put Bliesma in a shallow waveguide and compare it then.
You're right about one thing though, performance is just a bit better. Dome tweeters are hitting the limits of what is possible with todays materials and software.
I think that biggest advances are being made in planar tweeters (amt and ribbon in particular). Viavawe ribbon tweeters are remarcable. Also, HEDD/ADAM type AMT and Mundorf AMT measure great. Now, smallest Mundorf has around 24cm^2 surface, equivalent to 2" dome and it has great horizontal directivity. Subjective difference between 8cm^2 (regular 1" dome tweeter) and 24cm^2 ( 1" wide amt) playing the same tone is phenomenal.
It's not puzzling at all. You are comparing a waveguided tweeter with regular one. Bliesma is smaller so CTC distance will be smaller also, unlike SS. Put Bliesma in a shallow waveguide and compare it then.
You're right about one thing though, performance is just a bit better. Dome tweeters are hitting the limits of what is possible with todays materials and software.
I think that biggest advances are being made in planar tweeters (amt and ribbon in particular). Viavawe ribbon tweeters are remarcable. Also, HEDD/ADAM type AMT and Mundorf AMT measure great. Now, smallest Mundorf has around 24cm^2 surface, equivalent to 2" dome and it has great horizontal directivity. Subjective difference between 8cm^2 (regular 1" dome tweeter) and 24cm^2 ( 1" wide amt) playing the same tone is phenomenal.
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