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Old 1st December 2005, 07:26 PM   #11
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Moray,

i think i listened to that speaker from Meitner on a german high-end-show few years ago and they had a good testimonial in a magazine.

Am i right that the speaker finally struggled by an intellectual property of "Manger" ???

capaciti
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Old 1st December 2005, 08:45 PM   #12
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Default Highwood Audio

Capaciti: Manger was not in a position to challange Highwood Audio over the design. Manger did make inquiries to HIghwood but was advised that they were not in a position to take any action nor did they ever do so. Highwood Audio investors actually assumed Meitner though Meitner management did run the two merged companies after Museatex/Meitner moved to Calgary from Montreal. Meitner (the company) did not really want to persue the loudspeaker and finally gave up on the idea of marketing speakers. Best regards Moray James.
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Old 1st December 2005, 10:06 PM   #13
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Hi moray,

understood !

Its astonishing that they gave up on that speaker. As i remember the sound was as good as best fullrange systems and, with respect to a voice coil driver, even offered detailed high frequencies.

In comparison to fullrange ESL or magnetostats this speaker appeared to be less expensive in manufacturing.

capaciti
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Old 2nd December 2005, 05:53 PM   #14
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Default lots of reasons

Well the motor structure alone cost us $375.00 CND each to build in house at the time (1990). Museatex had it own agenda and Highwood Audio was not included. There were lots of things going on at the time and it just did not work out that's all. I think that it was a good design that worked well and sounded good. The very best versions of that speaker never made it to market. Maybe in another time. Regards Moray James.
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Old 3rd December 2005, 04:54 AM   #15
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Default Pebble in the pond

Moray James,

Can you tell us more about how the line source might work with this concept? I have read the original patent and it was quite intriguing.

Why did the motors cost $375? It seemed like a conventional voice coil??

Please tell us more if that is possible.
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Old 3rd December 2005, 06:09 AM   #16
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Default Well long story

The motor used H7 ceramic magnets the pole was vented and the magnet cavity was vented. The pole had a full copper sleeve and there was also a copper shorting ring at the base of the pole and a copper ring inside of the top plate. Theses were necessary to achieve extnded bandwidth. We used fero fluid in the gap to act as a liquid bearing to help keep the voice coil stable. The coil was a four ohm single layer coil again to minimize inductive roll off. There was just over one tesla in the gap. Top plate was 3/8 inch thick. Voice coil was 1.25 inch kapton with a coil of around 32 or 34 guage. The voice coil gap was about the same as a typical dome tweeter. You can imagine this as a bigish tweeter with the worlds biggest suspension. Diaphragm was 150 guage mylar HS. We looked into using neo magnets but they were still on some military list back then and supply was not a dependable thing then.
The line source came first but we were worried that the magnet structure would cost too much. That was before we added alll the tricks to the point source motor. We built both single ended as well as push pull versions of the line source. We used H5 ceramic magnets with iron pole pieces. Efficiency was not too bad at an honest 87 db (not just at 1KHz). I think we used 32 - 34 guage magnet wire (copper clad aluminum). There were eight or ten turns connected via a harnes so all the turns were in the same direction. The stage and image qualities of this speaker were world class I don't think that I have yet to hear the equal. That's about all I can recall at the moment. The real trick is to deal with terminating the traveling wave as it reaches the frame where you don't want it to reflect back into the diaphragm. Regards Moray James.
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Old 19th February 2010, 07:35 PM   #17
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Default Yes I know this is a very old thread...but...

Quote:
Originally Posted by moray james View Post
Avwerk: the speaker you are referring to was the Sumo Aria and was designed and manufactured by Highwood Audio of Calgary Alberta Canada. The review you spoke of was first published in Audio June 1992. There were also one or more reviews in Stereophile on Hybrid versions later. Sumo had financial troubles and the team of Sumo (distribution) and Highwood (manufacturer) split. Highwood Audio then merged with Museatex Audio (Ed Meitner) and released a new version under the Museatex name. That went for a couple of years until Museatex management killed the speaker after ******* around with it. The speaker was designed by myself Paul Burton and John Wright. John has since taken over service and modification of Museatex and Meitner equipment as well as designing new equipment, Paul is now back working in Britain and I am designing ausio cables and interconnects. Was a good design as a point source. Our first version (and best) was a line source which we never got to market. Maybe some day who knows. Ed carried on to start EMM Labs which you probably know about and is still here in Calgary. Hope that this helps.
The two designs are not at all alike but it is interesting to read that somebody remembered the old highwood speaker. Best regards Moray James.
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Old 19th February 2010, 08:11 PM   #18
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Sorry key miss hit and cant see any edit button....thread brought back becaue I was blessed to have come upon a pair of these in like new shape and they sound unlike anything else I have ever laid my ears upon......heavenly to say the least
Attached Images
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Old 27th March 2010, 10:47 PM   #19
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Quote:
Originally Posted by moray james View Post
The line source came first but we were worried that the magnet structure would cost too much. That was before we added alll the tricks to the point source motor. We built both single ended as well as push pull versions of the line source. We used H5 ceramic magnets with iron pole pieces. Efficiency was not too bad at an honest 87 db (not just at 1KHz). I think we used 32 - 34 guage magnet wire (copper clad aluminum). There were eight or ten turns connected via a harnes so all the turns were in the same direction. The stage and image qualities of this speaker were world class I don't think that I have yet to hear the equal. That's about all I can recall at the moment. The real trick is to deal with terminating the traveling wave as it reaches the frame where you don't want it to reflect back into the diaphragm. Regards Moray James.
Can you explain this? Is something like eminent technology push pull planars?
Or your line source prototype was like a DML?
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Old 28th March 2010, 02:11 AM   #20
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this was a vertical line source, all the turns on the diaphragm were in parallel and a harness took each turn off the diaphragm at the top and returned it to the next turn at the bottom so it was out of the magnetic circuit along the outside edge of the speaker frame. We experimented with a number of motor magnet structures as I said both single ended push push and push pull. This was not like an ET as we were driving the diaphragm as a line source not over its whole surface area. There was no attempt to make pistonic diaphragm motion strictly traveling waves. Please note that we are not talking here about the design that was taken to market as is shown in the pictures above. The line source was never marketed. Hope this helps.
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