Exactly! It's like a dream come true for planar owners -- I'm imagining my IVA's now with a tiny sub rather than 36 inches of bass panels.
As you say, the current sub has about the radiating area of two 12" woofers. I've heard others say the same thing you have about the GR Research dipoles, that the number you need depends on the size of your room. Wendell demoed these in Magnepan's listening room, which is actually a pretty sizable room -- just not huge. I can imagine versions of this with stackable woofers, as with the GR's, so you could adapt them to larger rooms.
I think Magnepan may have a real winner here -- I don't know how many times I've heard people say that this or that Maggie is just too big.
As you say, the current sub has about the radiating area of two 12" woofers. I've heard others say the same thing you have about the GR Research dipoles, that the number you need depends on the size of your room. Wendell demoed these in Magnepan's listening room, which is actually a pretty sizable room -- just not huge. I can imagine versions of this with stackable woofers, as with the GR's, so you could adapt them to larger rooms.
I think Magnepan may have a real winner here -- I don't know how many times I've heard people say that this or that Maggie is just too big.