Industrial design turns out to be Soundbase’s single biggest selling point: by $120 speaker standards, it looks neutral and nice, highly similar in styling to XtremeMac’s earlier and less expensive Tango Studio: both systems are based on a black plastic speaker shell with a fabric front grille and a pop-out dock, hiding their LED displays above the iPod and behind their fabric facades. Tango Studio went with a flat, slate-like shape, a…