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Multi-Way Conventional loudspeakers with crossovers

Some speaker driver measurements...
Some speaker driver measurements...
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Old 6th March 2019, 12:59 PM   #241
454Casull is offline 454Casull  Canada
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Thank you!
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Old 11th March 2019, 03:52 PM   #242
HiFiCompass is offline HiFiCompass  Ukraine
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The review of AudioTechnology 6" midwoofer 18H521706SD-4 has been added:

Review of AudioTechnology 18H521706SD-4 midwoofer | HiFiCompass
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Old 13th March 2019, 07:34 PM   #243
Martigane is offline Martigane
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This one looks great and reminds me of the satori mw16p. I think that its price is about double compared to satori.
I think that they have similar drivers with higher Qms.
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Old 14th March 2019, 10:35 AM   #244
HiFiCompass is offline HiFiCompass  Ukraine
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The measurements of ScanSpeak D2905/9700, D2905/9900 tweeters have been updated (only ETC, waterfall and step response):

ScanSpeak D2905/970000 | HiFiCompass
ScanSpeak D2905/990000 | HiFiCompass

The measurements of Accuton C30-6-024 have been fully updated:

Accuton C30-6-024 | HiFiCompass

Tha measurements of ScanSpeak D2908/714000 beryllium dome tweeter have been added:

ScanSpeak D2908/714000 | HiFiCompass
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Old 14th March 2019, 09:28 PM   #245
Martigane is offline Martigane
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Holy cow...
D2905/970000 looks good!!!
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Old 14th March 2019, 09:59 PM   #246
HiFiCompass is offline HiFiCompass  Ukraine
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Quote:
Originally Posted by Martigane View Post
Holy cow...
D2905/970000 looks good!!!
Yes, exceptionally good!
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Old 14th March 2019, 10:15 PM   #247
ScottG is offline ScottG  United States
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I'd really like to see a motor (power handling) like that applied to their conventional dome (D2905/970000). (..I suppose the Revelator is similar to that.. but the 3rd harmonic discontinuity from 2nd at lower freq.s is not good.)


-what I find shocking is just how primitive the "enclosure" pathing/stuffing is - a BIG thanks for cracking-open that sucker! (..of course I'm not sure it had to be LITERALLY cracked-open.)

You might try various foam ppi (grades) instead of that cotton (..I'm assuming it's cotton, maybe it's a ceramic or glass fiber). I'm pretty sure they use foam for the Ellipticore.

http://www.troelsgravesen.dk/OVAL-1/...cor-6-1800.jpg
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Last edited by ScottG; 14th March 2019 at 10:37 PM.
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Old 16th March 2019, 08:53 PM   #248
HiFiCompass is offline HiFiCompass  Ukraine
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Quote:
Originally Posted by ScottG View Post
I'd really like to see a motor (power handling) like that applied to their conventional dome (D2905/970000). (..I suppose the Revelator is similar to that.. but the 3rd harmonic discontinuity from 2nd at lower freq.s is not good.)


-what I find shocking is just how primitive the "enclosure" pathing/stuffing is - a BIG thanks for cracking-open that sucker! (..of course I'm not sure it had to be LITERALLY cracked-open.)

You might try various foam ppi (grades) instead of that cotton (..I'm assuming it's cotton, maybe it's a ceramic or glass fiber). I'm pretty sure they use foam for the Ellipticore.

http://www.troelsgravesen.dk/OVAL-1/...cor-6-1800.jpg
Thanks for the advice
It seems ScanSpeak do not long thinking just used in that beryllium model the motor from previous Revelator series tweeters - R2904/7000, D2904/7100, where it has special plastic supporting element for the aim:
- in the ring radiator version - to hold in place the bullet;
- in the dome version - to hold an underdome damping piece of felt.
In the 7140 there is no any of that elements, so, IMHO, the plastic "crab" was left there as a rudiment. It only inferes to the back pressure escape out of the under dome cavity.
In R2904, D2904 and all AirCirc tweeters are used the cotton pads, you are right.
In the Ellipticor ones it seems they use not the cotton but synthetic (maybe natural?) kind of felt. The back chamber cover in the Ellipticor made of a clear plastic and resonates very well
Attached Images
File Type: jpg Ellipticor.jpg (616.1 KB, 186 views)
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Old 16th March 2019, 09:25 PM   #249
ScottG is offline ScottG  United States
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..hmm, felt for the Ellipticore.

Yeah, I think you could get better subjective results with the right ppi foam (or even different layers of ppi foam). (..striving for similar damping/absorption but with much lower-loss/resistance (air-load to compliance) to the driver's motion.)

Are you sure that the 7140 isn't similar to the 7100? It looks like they both use the same outer-ring radiator design, and excursion is identical (..though mechanical resistance is half that of the 7100 - which is pretty awesome.)
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Last edited by ScottG; 16th March 2019 at 09:28 PM.
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Old 16th March 2019, 09:38 PM   #250
HiFiCompass is offline HiFiCompass  Ukraine
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Yes, I should give ppi foam a try...
7140 has the same motor as 7100 but without a damping felt under the dome.
The lower Rms due the titanium former instead Alu one in 7100.
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