A DIY Ribbon Speaker of a different Kind

It's clear to me what you're writing. Larger rubanoids go deeper, but why?
Say you have a driver area of 100 with an Xmax of 2 = VD 200. (VD is volume displacement and Xmax is the max amount of movement from the voice coil)
With a driver area of 200 you got the same result with an Xmax of 1 that's also VD 200.
So bigger area result in a lower Xmax.
Lets say the rubanoide Xmax is fixed at 1 then you need to increase the driver area to go lower.
That's because it's the sum of Driver area times Xmax = VD
And to go lower you need more VD for the same amount of dB.

Rob
 
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Okay Rob, this has been described differently in this topic. Of course, a lot of things can be manipulated with a crossover. Thank you very much. My question about the copper cap has not yet been answered. It's not about using it or not, but does this copper cap have to be electrically insulated from the pole plate?
 
Mass in relation to the strength of the drive. Weak drive equals lower fs. The diaphragm shape of the ruba, together with the single-sided drive, is a problem of little movement and little draft. Increasing the mass of the same membrane brings little. High frequencies also suffer from this. Fs the rubanoid is usually very deep.