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Multi-Way Conventional loudspeakers with crossovers

Why not the Aurum Cantus AST25120?
Why not the Aurum Cantus AST25120?
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Old 10th June 2019, 10:17 PM   #1
Defo is offline Defo  Norway
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Default Why not the Aurum Cantus AST25120?

Why is this driver not more used? Seems superb:

- Can be crossed at 1 Khz
- Better vertical dispersion than traditional ribbons
- 98 db sensitivity
- Super clean waterfall
- Excellent extension

Only downside I see is the price.
Or am I missing something here?
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Old 10th June 2019, 11:02 PM   #2
lowmass is offline lowmass  United States
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its likley a good driver with typical limitations of the breed

vertical dispersion is no better or worse than any ribbon of same length

a cross at 1K will likley sound a bit colored

horizontal dispersion is not that good in these designs due to diaphragm width
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Old 11th June 2019, 06:11 AM   #3
Defo is offline Defo  Norway
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Quote:
Originally Posted by lowmass View Post
its likley a good driver with typical limitations of the breed

vertical dispersion is no better or worse than any ribbon of same length

a cross at 1K will likley sound a bit colored

horizontal dispersion is not that good in these designs due to diaphragm width
It says on Parts Express that "Aero Striction tweeters vertically beam far less than the ribbons" (Aurum Cantus AST25120 Aero Striction Tweeter 8 Ohm)

Distortion is only 0.3% at 1 Khz. I reckon it begins to rise below that.
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Old 11th June 2019, 12:47 PM   #4
lowmass is offline lowmass  United States
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well it may say that BUT beaming is determined by diaphragm size. These should "beam" just as much as any ribbon of same length.

That said, in my experience you can use a diaphragm up to about 75-100 mm long in most listening environments before the vertical beaming becomes an issue

The .3% distort thing doesn't always tell the whole story. Maybe Arum has the diaphragm resonance issues in these designs figured out, IDK for sure, BUT basically these designs tend to be a bit colored at that low a frequency due to the shape size mass mechanical properties etc of the diaphragms structure. The very sharp roll off in the response curve below 1Khz is telling. There is a sharp non linearity in this region.
Also at what power level is that distort measurement?

These designs also tend to use a horizontally wide diaphragm that limits dispersion above 10Khz

Now to put what Ive said in perspective....

I speak from a designers standpoint always looking to make a better driver, so what I say doesn't mean the driver in question is not a good driver. The folded diaphragm designs certainly have strengths... reliable, high sens, high power, and if done well very good sound
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Old 11th June 2019, 06:31 PM   #5
jzagaja is offline jzagaja  Poland
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Why not the Aurum Cantus AST25120?
Anyone tried 15" waveguide with that driver?
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Old 11th June 2019, 10:10 PM   #6
AllenB is offline AllenB  Australia
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Very nice jzagaja, this is what I'd try (not exactly, but similar).
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Old 11th June 2019, 10:23 PM   #7
ICG is online now ICG  Germany
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There are 3 reasons against that driver:
  • It doesn't hit the 98dB until 12kHz. Equalized, reckon with ~93dB or less.
  • The vertical dispersion will be around ~20-25°. If you don't have the listening distance (~3-4m minimum), don't bother looking at that driver.
  • It's expensive. Look for other Air Motion Transformer drivers, there are others which are cheaper with similar performance.
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Old 11th June 2019, 10:44 PM   #8
mandoman is offline mandoman  Australia
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I have the smaller AST from Aurum Cantus, and you are wrong about vertical dispersion. I don't know what Aurum Cantus has done to solve that problem, but they don't beam. I also have an Aurum Cantus ribbon, and that one does beam. The Aurum Cantus AMT's are excellent but pricy, and I suspect the pricy bit is why they are not used much.
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Old 11th June 2019, 11:00 PM   #9
jholtz is offline jholtz  United States
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Quote:
Originally Posted by ICG View Post
There are 3 reasons against that driver:
  • It doesn't hit the 98dB until 12kHz. Equalized, reckon with ~93dB or less.
  • The vertical dispersion will be around ~20-25°. If you don't have the listening distance (~3-4m minimum), don't bother looking at that driver.
  • It's expensive. Look for other Air Motion Transformer drivers, there are others which are cheaper with similar performance.
What other AMT's perform as good or better for less money?

Jim
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Old 11th June 2019, 11:33 PM   #10
mandoman is offline mandoman  Australia
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Quote:
What other AMT's perform as good or better for less money?
Good question. Since you seem to know it all, how about a suggestion ICG?
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