The Walsh 5000s produce a very refined yet coherent sound in a large airy soundstage; they are audibly superior to the mk2. I spoke to JS at Ohm when I was debating upgrading to the 5000 years ago; he told me the inverted cone main driver was a cost-no-object driver using cast frames, very powerful neodymium magnets, cloth surrounds for long life and excellent wave termination and IIRC metal cones, though not sure about this last detail. The thing is they have such a low noise floor, no energy storage and no colorations. Because of their high dispersion dynamics (with the right amplifier) are startling and explosive, energizing the entire room.
You should call JS at Ohm. He will give you an honest assessment whether the 5000s are a worthwhile upgrade. Of course the F5015s are his definitive loudspeaker for wide range and highly dynamic unrestrained reproduction. Reportedly they are extraordinary!
