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cv wrote:

Ok, I managed to get my measurement setup running. Behringer ECM8000/PC soundcard kind of thing. I measured the following tweeters: Focal TLR TAD PT-R9 Aurum Cantus G1 Fane 5022 I don't have an absolute level calibrator and I need to take time to try and make the measurements accurately, ensuring the distances are correct in each case. But having said that, if we assume each of these drivers is an 8 ohm load (I left the signal level and gains untouched), then I measured, in relative terms, sensitivities commensurate with the makers figures. In other words, the TLRs (rated at about 95db/W and coming with individual calibrated response plots) were a db or two less sensitive than the PTR9s, which in turn were a bit less sensitive than the G1s. Early indications are that the 102db/W is off for the G1. They don't sound like 102db either. But I think the PTR9 spec would seem to be honest, at least with my units. The Fane has such a crappy humped response it's impossible to draw any conclusions there! Anyway,  this is very rough - will try and find time to take some more careful measurements later in the week, hopefully tomorrow.

Well, Chris, I need to check out my other PT-R9 driver. Perhaps the one that I tried was discharged … I do not think so but I will do it within a day or so.

BTW, currently my completion for more interesting high sensitively ribbon tweeter looks like coming to the end and it is possibly that you will be the winner. I spoke today for a quite long time with the proposed by you RAAL’s Alex and I like the guy quite a lot. He has very valuable from my point of view combination of knowledge and desire to use his expertise in applied manner to benefit the objectives of my project. I have very-very pleasant feeling about him and I very much like how he thinks. We did not decided yet but perhaps we can cook a custom 107dB ribbon driver. If we move forward then you will be declared a winner and that BMW Z4 Roadster will be shipped to you.

Thanks,
Romy the Cat

PS added in a few hours: Chriss, I juts got another PT-R9 from the box. I did not measure it but just A/B the subjective output of the both tweeters and I confirmed that they are identical. I was pretty convinced that it would be the case. The only explanation that I might see is in the efficiency of my room at HF. I have, as you remember, quite a lot of going on in my room that reduces the room response at HF (all that hanging thing, the book and record shelves, the cats t-shorts and so on…) Perhaps it is that eats the affectivity HF in my room. 9dB, Hm, quite a lot! I never consider my room over-dumped but it defiantly never was “live”. I really am not wiling to change anything with the sound of my room. Probably it is better to continue beaching about the tweeters manufactures….

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