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PostPosted: 21 Jul 2008, 15:21 
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Joined: 21 Jul 2008, 12:51
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A company called Mark & Daniel audio has remade the ESS Heil air motion drivers with some modifications
you guys have got to check these out.
Here are the 2 they are releasing
http://www.mark-daniel.com/Dir_En.asp?Proid=11
http://www.mark-daniel.com/Dir_En.asp?Proid=13


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PostPosted: 21 Jul 2008, 18:15 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
The DM-4 seems interesting. Do you need a 4th order XO at 750Hz? It would be nice to see some measurements.

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PostPosted: 22 Jul 2008, 12:40 
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Actually M&D use a 6db network on them @900hz but 750hz may be a little low.
John K (www.zaphaudio.com) will be doing tests on the drivers in a few weeks and will be posting his findings on his website.

They are a very cool driver and image so much better than the original Ess Heil drivers they are also much better off Axis.

If you guys have a Mark & Daniel dealer near you (theres only 9 in the US right now) you should check them out.

Jason


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PostPosted: 22 Jul 2008, 17:22 
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A 1st order crossover at 900Hz sounds very unrealistic!!! Are you sure that about that? 1st order at 900Hz = -6dB @ 450Hz!!!

I look forward to the Zaph results since there is very limited information on the vendor site.

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PostPosted: 25 Jul 2008, 17:59 
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Joined: 06 Jun 2008, 12:22
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Location: NY, USA
What sort of price range are we talking about here?


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PostPosted: 31 Jul 2008, 23:53 
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Interesting. I was a very big fan of the ESS Heil AMTs. Has the patent on these expired or are these just another cheap Chinese ripoff with a big markup? I would also like to know what the pricing and availability on these would be.

Is this your product?


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PostPosted: 01 Aug 2008, 09:16 
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I believe it is his product in a way. He was at a show when the manufacturer and he struck a deal that he could sell them. The patent has expired.
Ri

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PostPosted: 01 Aug 2008, 12:05 
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billp, welcome to the forum.

RiGuy wrote:
I believe it is his product in a way.


Well, if that is the case, he is not building any credibility by posting in this manner. :down:

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PostPosted: 01 Aug 2008, 12:25 
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The prices will be
DM-1 $175 a pair
DM-4 $250 a pair

We are in no way affiliated with Dr Heil nor did he "give" us the right to sell them.
His patent ran out in 1994 and Mark & Daniel took the design fixed the flaws and made them for their own speakers.
I have talked them into allowing me to sell them directly to the diy public but unfortunately they only released the 2 smaller drivers for now.

The M&D "Dreams" drivers have a better overall frequency response and power handling without having to worry about blowing stuff up.
Heils drivers had a 50% failure rate thats why they went up in smoke but he had a great idea.


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PostPosted: 01 Aug 2008, 12:36 
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Joined: 21 Jul 2008, 12:51
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This is copied directly from their website about the crossover

"Mark & Daniel® speakers typically have a crossover at 6dB/octave or 12dB/octave for the bass unit and a low distortion 6dB/octave network for the Dreams wideband driver. Matching this to the Dreams driver, with its mechanical attenuation yields a high roll-off response over 24dB/octave down from 800Hz. The crossover network is built with large Gauge 15 (0.15mm wire diameter) coreless inductor, non-polar capacitors, and resistors for fine adjustments to the system. Premium XPP capacitors (with 0.07% dissipation factor) have also been employed for improved performance."

Here is a link to it as well http://www.mark-daniel.com/ManualShow_En.asp?ID=22

Jason


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