Actually, I think the original OHM Fs used titanium, aluminum, and paper in their famous Walsh driver. Maybe the new 1000s are steering back in the direction of using more exotic materials in the driver again? I can't find any mention of what is used in the new drivers anywhere. The OHM site only indicates that they are new and the resulting sound is "evolutionary".
The Walsh driver operates differently than conventional dynamic drivers. I don't know if metal construction lends any particular sound in the case of a Walsh driver.
The Walsh driver operates differently than conventional dynamic drivers. I don't know if metal construction lends any particular sound in the case of a Walsh driver.