Magnepan 3.7

If they were to use a straight foil for the woofer, a transformer would be necessary due to the impedance.

Yankee Ribbon used a push pull ribbon for there speakers all other magnostats that i'm aware of use planer bass units
( maggies , apogee's , et al). The Yankee approach is better as the planers tend to be one legged and do not have a linear field.

regards,

Josh358, Yankee ribbon has a true "ribbon woofer" ....

James,

Yeah, I'm leery too of initial reports since in the case of the 1.7 there was a fair amount of misinformation at first.

BTW, I see from the Planar Asylum that the first review is in:

http://www.computeraudiophile.com/content/CES-Day-Two-Notes

Weseixas,

The Maggie tweeter ribbon is actually 3 ohms, owing I think to its length and thinness. Here's a schematic of the 3.6:

http://www.integracoustics.com/MUG/MUG/tweaks/mag3.6xover.jpg

I think Apogee's ribbon mids had such a low impedance because they were 3" wide.

>Josh358, Yankee ribbon has a true "ribbon woofer" ....

That's interesting. How did they do that?

>The magnetic assembly is what determines if it is a true ribbon or not , not the type of diaphram,

You have a point, though I'm thinking that technically it's based on whether the diaphragm is shaped like a ribbon or not (attached at two ends rather than at all four sides). So the Apogees mids mylar backing would still be considered true ribbons, even the ones with three traces.

Of course, since true ribbons are narrow, the magnet assembly changes too, since a side-by-side arrangement has a field that's more linear with displacement. As I understand it, 3" is the maximum you can do that with practical magnets.

Also, as I understand it, at least some ribbons have low tension to put the vertical resonance below the driver's frequency range.