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Seas Excel Graphene?
Seas Excel Graphene?
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Old 5th February 2019, 02:18 PM   #1
racingpht is offline racingpht  Canada
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Default Seas Excel Graphene?

I saw this month ago, but seems nobody's talking about it?

I wonder what that will be?

In my knowledge, if it's true, this is the first real graphene speaker?

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Old 5th February 2019, 02:27 PM   #2
5th element is offline 5th element  United Kingdom
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Go to their website, they've updated it with a datasheet of the first driver. It's a bit disappointing. It's just a classic SEAS Excel magnesium cone with a graphene coating.
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Old 5th February 2019, 02:45 PM   #3
racingpht is offline racingpht  Canada
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Hi 5th element, thanks for your info!

Just saw the new white paper coming out in Feb.
http://www.seas.no/images/SEAS_Graphene_White_Paper.pdf

The new driver did push the break up node ~1.5khz higher, and inductance is much lower.

Another interesting is Seas seem to be moving to titanium coil too. Resulting in much higher QMS / Rpeak.

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Old 5th February 2019, 03:29 PM   #4
5th element is offline 5th element  United Kingdom
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Yeah, as I said elsewhere, we'll have to see some measurements to see just how much difference the FEA optimised motor makes to the overall performance.

The breakup shift is nice and it'll be interesting to see if it continues across the other drivers in the range. In other words is this because of the graphene or because they've reworked the cone profile slightly.

I suppose I was hoping for something completely different from SEAS. We've already got SB acoustics producing metal cone drivers without the usual HD peaks associated with them. Will this graphene coating make a considerable difference here?

I guess I was hoping for a thin sandwich type cone with grapene skins, giving very high stiffness, so no breakup within the passband, like the metal cones, but with high internal damping so that nothing propagates into the HD.

I guess the impedance blip at 5-6.5kHz isn't as severe with the graphene driver, even if the actual SPL peak is worse.
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Old 5th February 2019, 03:51 PM   #5
racingpht is offline racingpht  Canada
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I guess much lowered inductance made the peak higher.

Also, higher QMS will remove some mech damping, but I'm not sure how much the QMS effects HF. A MarkAudio article talked about this effect(Alu voice former) which seem to be significant.

But yeah, since we have the excellent SBA NAC drivers, bigger SD, even higher freq breakup, much cheaper/ lower tech. I think it's fair to expect a driver with no much breakup at this tech level. Something like SCM634 maybe.
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Old 5th February 2019, 07:38 PM   #6
wolf_teeth is offline wolf_teeth  United States
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Of note- Titanium is likely the VC former, and not the coil as stated in the datasheet, because titanium is a poor electrical conductor.

Later,
Wolf
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Old 5th February 2019, 07:55 PM   #7
Zvu is offline Zvu  Serbia
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Take notice of impedance grid on the right, on posted graphs. New graphene might not be better at all.
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Old 5th February 2019, 07:56 PM   #8
racingpht is offline racingpht  Canada
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True. I'm always talking about voice coil former, and that's what affecting QMS.

The coil wire is CCAW as stated in the data sheet.

Thanks for clarification anyways!
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Old 5th February 2019, 08:19 PM   #9
5th element is offline 5th element  United Kingdom
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Quote:
Originally Posted by Zvu View Post
Take notice of impedance grid on the right, on posted graphs. New graphene might not be better at all.
Ugh, indeed!
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Old 5th February 2019, 08:23 PM   #10
ErnieM is offline ErnieM  United States
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Looks like the main goal was humidity protection over any real sonic advantage.

And a good marketing buzzword.

Last edited by ErnieM; 5th February 2019 at 08:27 PM.
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