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   Home » Audio Discussions » Magico Mini or Jonathan Valin maxi? (22 posts, 2 pages)
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07-06-2010 Post does not mapped to Knowledge Tree
KeaAudio
NZ
Posts 6
Joined on 07-05-2010

Post #: 21
Post ID: 13934
Reply to: 13931
Horn woofer
fiogf49gjkf0d
I have never heard of any woofer that manages 50Hz lower cut off frequency in a horn arrangement. The simple fact is that a woofer does not emit sound under the resonance frequency (that is without artificially changing that, ie active). The resonance frequency can be calculated simply with the mass of the cone assembly and the suspension (that is spider including surround and air load). So if you make the suspension rather stiff (that also happens if the surround is very stiff) then the resonance frequency goes up. In order to compensate for that you would have to make the cone heavier (that is why the big woofers have a  harder suspension, because they are so heavy). The disadvantage of making the cone heavier is that the efficiency goes way down. This is partially compensated by the larger effective cone area of large speakers, but again there is a limit to everything. Putting a compression chamber behind the woofer certainly makes the suspension extremely stiff and you would have to use very very heavy cones to achieve 50Hz. So what is the idea????
You did not say what the problem with soft surrounds is? I cannot see any problems with that, not even in horns.

The Goerlich cones are very light and as I said, have an aluminium foil glued on top of the cone, basically to make it airtight. Kea Audio cones do not need that because the material forms a thin layer on the outside which makes it airtight. Inside, as mentioned it is foam, exactly as the Goerlich/Podzsus drivers.
As I said, there is no advantage of sandwich, it is only used to produce a hollow inside, which in our case is achieve with a foam. YOu can call this sandwich, but because the outer layers have no supporting function and are very thin anyway I would not consider that sandwich (it is a matter of opinion however).
Hope that clarifies it.

regards
J.Lang
Kea Audio
07-06-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,916
Joined on 05-28-2004

Post #: 22
Post ID: 13935
Reply to: 13934
Leather-like materials or plastics surrounds?
fiogf49gjkf0d
Kea Audio,

Regarding the driver. When I meant hard suspension I meant low excursion. Acoustic pressure equals displacement by volume and displacement equals surface by excursion. In horn we add the horn EQ, so for a given frequency we might have lower excursion, still managing to hit targeting frequency. Sure, with limited cone size we will be obliged to soften suspension but we in horn situation will be doing to lesser degree then it would be in case if it was a direct radiator. So, I would probably need to talk about the concept of “minimum stiffness”. Compression chamber sure will stiffening suspension and driver resonance up but still I would like to find somehow a way to cone to be hard-suspended, still having small size and low resonance. I know that I am taking about impossible things… but I am also talking about a driver that does not exist.

BTW, do you use any other surrounds in your cones besides rubber?  How about the leather-like materials or plastics?

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
Page 2 of 2 (22 items) Select Pages:  « 1 2
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Magico: Robert Harley’s upperbass mouth...  Surprisingly interesting write up by Federated Mike abo...  Horn-Loaded Speakers Forum     35  285014  02-19-2006
  »  New  Magico: biological minded speakers..  keep them coming...  Audio News Forum     1  27421  09-29-2006
  »  New  Kharma Speakers as pH-indicator of the worst in Audio...  Kharma corporate video...  Audio Discussions  Forum     8  105033  11-21-2006
  »  New  Jonathan Valin shell be an Alcatraz reviewer...  The world is bad...  Audio News Forum     4  52828  08-23-2007
  »  New  Macondo vs. the “industry sponsored speakers”..  Correction : "Man in the street"...  Horn-Loaded Speakers Forum     4  51493  05-11-2008
  »  New  Magico Model 6 loudspeakers...  The Federated Mike becomes a Sound expert....  Audio Discussions  Forum     2  43460  06-20-2009
  »  New  About reviewer’s qualifications and disqualifications...  Sad thing....  Audio Discussions  Forum     1  26495  06-21-2009
  »  New  Reading an official audio publication - TAS..  Yes, we are there...  Audio Discussions  Forum     6  53369  09-06-2010
  »  New  Magico new 5 ways idea. Review and Critiques..  Magico new 5 ways idea. Review and Critiques...  Horn-Loaded Speakers Forum     0  18246  08-07-2011
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