Interesting comparison - in terms of stereo image I think the A10 internals seem more focussed in the centre while retaining full width for audience sounds - the nakamichi cm-300s sound slightly undefined in the centre - always hard to turn sounds into words of course! I'd say you have omni capsules on the CM-300s rather than cardioid? Overall, I'd rate the A10 internals, in this example, as "no disaster".