While JBL's newest speaker system OnBeat ($150) is definitely the coolest iteration yet released on the company's "weave" design theme from an aesthetic standpoint, we'll admit to being just a little confused by its practical application. Armed with two large drivers inside and attractive chrome accents on a glossy black plastic enclosure, OnBeat is JBL's first Made for iPad-ready speaker, and comes with interchangeable plastic and rubber-padded brackets…