Its hard to think it could get any better from here. But I'm sure they'll find a way.
Meanwhile, over at Scan-Speak, it must be hard to manufacture that elliptical magnet system with good consistency
Rub/buzz failure for the D2404/55200-00
Rub/buzz failure for the D2404/55200-00
-60 dB at those levels is definitely not SOTA compared to prior reference drivers. I don't know if you saw, but HFC mentioned the unusual distortion in the review as coming from his test setup, not the driver itself. Look at the near-field measurements.
Sorry we must be looking at different things.
when driven with 8V? ie. 95dB@1m
-60dB H2, -65dB H3, -75dB H4, -85dB H5 is not SOTA?
Can you copy and paste the image here: the area of your concern or critique?
Or where in the review there was mention of “weird distortion”, or your specific concern?
when driven with 8V? ie. 95dB@1m
-60dB H2, -65dB H3, -75dB H4, -85dB H5 is not SOTA?
Can you copy and paste the image here: the area of your concern or critique?
Or where in the review there was mention of “weird distortion”, or your specific concern?
I assure you that HD bursts around 200 Hz are due to the test baffle resonance. Look at the "Near field HD spectrum (20mm distance)" measurements too.
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The SEAS looks very nice for a $90 tweeter.
For $500, the Scanspeak is a puzzle. I not sure what the market is for a $500 soft dome tweeter that has HD performance very similar to most $40 - $60 drivers...
For $500, the Scanspeak is a puzzle. I not sure what the market is for a $500 soft dome tweeter that has HD performance very similar to most $40 - $60 drivers...
Re: SS Ellipticor tweeter- The other source of this distortion could be due to extraneous vibration. The fact that it occurred in two samples- reduces the chance that it was faulty.
I’ve seen a similar curious effect with one of my drivers- distortion at a specific frequency. i troubleshooted this to being caused by screws that were not completely fastened. There was a minuscule chattering of the faceplate against the screw. After a gentle tightenening of the screw, it went away.
Yevgeniy,
I wonder whether this has anything to do with it?
Or the decorative faceplate, which snaps/clicks on, without a grommet, presumably.
Is the distortion still there if you measure/use it without the decor ring?
At least one other user, Troels reported that he didnt like the decor ring…
best regards,
Thanh
I’ve seen a similar curious effect with one of my drivers- distortion at a specific frequency. i troubleshooted this to being caused by screws that were not completely fastened. There was a minuscule chattering of the faceplate against the screw. After a gentle tightenening of the screw, it went away.
Yevgeniy,
I wonder whether this has anything to do with it?
Or the decorative faceplate, which snaps/clicks on, without a grommet, presumably.
Is the distortion still there if you measure/use it without the decor ring?
At least one other user, Troels reported that he didnt like the decor ring…
best regards,
Thanh
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That decor ring was definitely a problem when I measured 18WE distortion. Whole decor ring concept is not good.
Midwoofers seem to have the level of performance one would expect, but ellipticor tweeters don't.
Midwoofers seem to have the level of performance one would expect, but ellipticor tweeters don't.
I understand what you say about. No, the problem in both tweeters is in the voice coil rubbing, certainly. I spent a lot of time trying to fix this problem but without success.
The reason is the axis of the elliptical voice coil doesn't match with that of elliptical motor. There is an angle between them about of some degrees.
Moreover, the voice coil edge has a bit of propellerness.
Attachments
Hificompass: it seems larger ellipticor tweeter could have the same issue. What is you opinion?
https://hificompass.com/en/speakers/measurements/scan-speak/scanspeak-d3404/552000-ellipticor
https://hificompass.com/en/speakers/measurements/scan-speak/scanspeak-d3404/552000-ellipticor
I had three pairs of the D3404/55200 and none of them had the voice coil rubbing problem.
The measurements of the Scan-Speak 18WE/8542T00 midwoofer:
https://hificompass.com/en/speakers/measurements/scan-speak/scanspeak-18we/8542t00
https://hificompass.com/en/speakers/measurements/scan-speak/scanspeak-18we/8542t00
https://hificompass.com/sites/default/files/zamer/afc315/ptt6.5x04-naa-08a_0.3m_8v_hpf2-50.png
At around 170 Hz and 210 Hz are two strange peaks in HD5. It may also in HD3 and HD4 as well, but the "red" shows up more obviously to the eye. On the left hand side, the HD5 is -75 dB, and on the right hand side the HD5 is -80 dB, but at those two peaks it's around -65 dB with no obvious reason as to why.
Anyway, we don't need to discuss this further, HFC already said it's an issue on his end, not with the driver.
Another high value driver from Lavoce! A 6" high sensitivity midrange with fairly smooth FR and good distortion. Shame about the non-circular frame.
The circular framed MAN061.800 must be quite good too. (MidrangeAluminiumframeNeomotor 6" driver, 1.8" voice coil)
Yevgeniy- thank you for posting
The circular framed MAN061.800 must be quite good too. (MidrangeAluminiumframeNeomotor 6" driver, 1.8" voice coil)
Yevgeniy- thank you for posting
Wow. That D25AG-05-06 tweeter is an old but good... Only 33 years young... best crossed over above 2.5-3KHz
You haven't seen the 35-06 yet. 😉 The Vifa 1" domes with air volume behind the magnet were a no-brainer then.
No I haven't. That's the first and only Vifa tweeter I've ever used.
Dennis Murphy had a Vifa P17-D25AG design about 2 decades ago that crossed it at 2KHz LR4 using a 3rd order electrical.
I built a few pairs for college friends when we were doing EE... now engineering or university doesn't teach you how to build speakers, but it was great fun.
It made me aware that Vifa/DK made great value drivers, but I had never seen any 3rd party distortion measurements.
I didn't have measurement equipment at the time but the tweeter sounded good to my ears - just as nice as my own first tweeter Scan-Speak D2905/9500
US$100 2 decades ago now that was a lotta beer money when you're a college student.
Dennis Murphy had a Vifa P17-D25AG design about 2 decades ago that crossed it at 2KHz LR4 using a 3rd order electrical.
I built a few pairs for college friends when we were doing EE... now engineering or university doesn't teach you how to build speakers, but it was great fun.
It made me aware that Vifa/DK made great value drivers, but I had never seen any 3rd party distortion measurements.
I didn't have measurement equipment at the time but the tweeter sounded good to my ears - just as nice as my own first tweeter Scan-Speak D2905/9500
US$100 2 decades ago now that was a lotta beer money when you're a college student.
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We just had a nice discussion about the D25AG-35-06, including some measurements. Post #11-#19.
https://www.diyaudio.com/community/...nce-between-two-tweeters.384409/#post-6975639
https://www.diyaudio.com/community/...nce-between-two-tweeters.384409/#post-6975639
I had a angled voice coil recently with 12mu, quality control issues.
