What i-DS3 Plus offers users is a mirror of the iPod and iPhone sales pitch: an extremely clean industrial design that hides smart internal components. The base of the system is a unified dock, amplifier, and speaker system that is roughly 15.5 inches wide, up from 12.75 in i-DS2, 6 inches deep versus i-DS2’s 5.75”, and roughly the same 5.5 inches in height. These differences mightn’t be enough for the average observer to notice…