Originally Posted by kaushama
It seems, GO-VIBE's limiting factor as a portable amp is, its minimum operative voltage being given with 9v batteries. The optimal voltage for the amp seems to be 24V regulated, as Andrea experienced with it. Even the site says to have TD 9.4 V batteries for better performance.
The Xenos instead, stock or modified (particularly stock), performs very close to the 'optimum' with 9V.