I wouldn't expect a spread spectrum like that to be able to reach FS. Imagine you have a 1k tone as FS driving a 10W amp at full volume. Now add another tone at 500Hz also at FS. You will now be trying to drive your 10W amp to 20W or to +6dB FS. If the scale is a representation of voltage, not power the max you can get with the two tones is -6dB FS on each bar. The bars are already well overinflated, Wiim themselves have said they have made the spectrum more pleasing to the eye by raising the bars for lower volumes as the bars were too low and not using the screen real estate available
