Quote Hugh Robjohns:
they also replaced the linear PSU with a switched mode one. Overall that saved about 25% of the cost, but it also improved the noise floor in a worthwhile way. So in performance terms the MKii model is slightly better than the original.
When I plug a ribbon into my ISA One and crank up both the impedance and the gain, there's rather a lot of hiss (to the extent that it steers me away from the highest impedance setting). Would the improvement in the noise floor be noticeable in this scenario?