JBL has announced OnBeat Rumble ($400), its third Lightning speaker dock. OnBeat Rumble is a Bluetooth-enabled 50-watt speaker with a built-in 4 1/2” subwoofer and two 2.5” full-range drivers. In addition to the Lightning connector, it also has an auxiliary input jack for older and non-Apple devices. Users can download JBL’s free MusicFlow app, which adds additional EQ modes to OnBeat Rumble, as well as enabling music browsing…
