I Was Wrong

[Borat]

i had a feeling this was the case from the beginning but somehow i manged to fight that feeling off then. but i have come to grips with it now.

i am talking about :

http://www.diyaudio.com/forums/planars-exotics/151474-plur.html

http://www.diyaudio.com/forums/planars-exotics/152332-plur-vs-isodynamic.html

http://http://www.diyaudio.com/forums/planars-exotics/154887-plur-2-evolution.html

i previously implied that this technology allows one to create wider ribbons - almost as wide as planar speakers or ESLs.

that was WRONG.

in fact it doesn't provide any advantage in possible width over regular ribbon technology.

this is to say field strength still drops proportionally to 1/gap width. my apologies to everybody.

this fact was somewhat obscured by peculiarities of the design as it doesn't manifest itself "at first". instead it acts more like an asymptotical limit. but this limit is there and there is no way around it.

however this can be viewed also as a blessing in disguise. because while on one hand it means ribbons wider than about 2" are impractical on the other hand it means that the technology allows for much higher field strength with conventional width ribbons than my original 4" wide model had.

the linearity benefit is real though. and "plur 2" takes it to its ultimate conclusion.

i will next post some simulations of a standard 1" width ribbon motor.

 

[Borat]

i narrowed the gap from 4" to 1" to recover field strength.

the maximum peak to peak excursion ( space between front and rear magnets ) here would be 0.5"

i made a plot of the field along this red line:

which looks like this:

and along this red line:

which looks like this:

so in fact the technology allows for the same kind field strength levels as you would expect to have in a conventional ribbon but with absolute linearity.

as for the argument that magnets in front of the ribbon would interfere with sound - the AMT drivers such as Beyma have sizeable obstructions in front of the "ribbon" and nobody complains.

 

[gymwear5]

With the gold ribbon concept loudspeaker and other push-pull ribbon designs the acoustic cavity in front and behind the driver create a tuned chamber that creats a Hump in the respnse - with the GRC the hump was at 7Khz - but was broad enough to be EQ'd out by the crossover.

 

[Borat]

With the gold ribbon concept loudspeaker and other push-pull ribbon designs the acoustic cavity in front and behind the driver create a tuned chamber that creats a Hump in the respnse - with the GRC the hump was at 7Khz - but was broad enough to be EQ'd out by the crossover.

i tried searching for "gold ribbon concepts 3.0" but couldn't find a single picture.

if you don't have a picture could you perhaps draw a sketch of what it was like ?