I'm preparing a new article for the Boodo Khan on my website and I read at Walkman central that Panasonic had some models, like the RF-H20, with an "ultra phonic mode" that is supposedly similar to the DOL system.

Does anyone have any of this panasonic or knows anything? How this system works? Is is a simple EQ or a dynamic amplification like the DOL?

any info/photos are welcomed, thanks!