Magnepan 3.7

Good.
That should take care of future delam problems.
Now, just keep 'em out of direct sun and away from smokers.

All you need to know is that the top speakers at magnepan,
the 3.6/7 and the 20.1 are both true ribbon above the 2nd crossover.

Below that? Well the difference between QR and planer is negligible, consisting of wire vs 'ribbon' glued to the mylar. The 20.1 adds a true push/pull magnet structure on BOTH sides of the mylar.

People also replace the 3M glue with Gorilla glue. Sticks like crazy and delam problems are history.
Check out the (Extensvie) DIY crowd over at Audio Asylum....the Planar Asylum, at that.
Many discussions have been had about the cost/ benefit of Magnepan speakers. Definitely built to a price, the question becomes one of 'Would they sell at 2x the price with 'perfect' build?' That would be real wood frames, no staples and upgraded crossover components.
If my 1.6s had cost 3K$ when I looked for speakers, I'd be listening to Vandies.

Agreed with DG, mostly.
As you go up the Magnepan line, you get 'more'. But, the quality that involves you with panels remains constant. You can ALMOST buy them without formal lengthy audition...if you know you like them at all.
Some people simply stop at MMGs and maybe modify them.....wood frames and new crossovers.....

Do Ribbons use 'foil'? I would expect the driver portion to be thicker than foil. Maybe .050" or so. No?
Isn't the driver portion of a ribbon under some tension? (pull)

The difference between QR and 'regular' panels is that the QR uses foil. The weight / area is about the same as the wire, but being flat is sticks to the mylar way better.
I, too, think that 'QR' is slightly misleading.

Wesixas, when you say 'all foil diaphragms will have some sort of mylar backing' are you referring to Magnepan style ribbon drivers? They have mylar and a conductor laminated together? Then stretched or at least put under tension?

Is the ringing you refer to out of band hi or lo? Or perhaps just poor damping? The mylar would than make sense.

Exactly,
The only difference between QR and 'regular' maggie driver is foil vs wire.

Onemug:
I said the difference was negligible and I'll stand by that....at least from the physics aspect. The driver has about the same DCR. So, they use about the same 'diameter wire'.... Take the wire on the regular driver and smush it out..You'll get a ribbon about the size of that used on the QR panel.
The advantage? It sticks a LOT better to the substrate. LOTS.
Toss in some voicing tests....crossover parts and such and there you go....1.6 becomes 1.7 and so on. I'm not that excited, though it IS a step in the right direction. I just think the nomenclature of 'Quasi Ribbon' is an advertising invention.

Push pull? besides having nothing to do with QR, what is the point? PP leverages the panel technology. Personally, I turn my panels around and listen to the pole piece side, anyway...just like my old MG-1s.

I suspect people would go really nuts if Magnepan decided to use stronger magnets. That would up the sensitivity or power handling or both. Somebody suggested taking the pole piece / magnets off of a dead panel and making their OWN PP design. I'd like to help with that one! Bet it works.