JBL has announced both its new On Stage 3 portable iPod speaker system and its new Reference 420 and 610 headphones. The JBL On Stage 3 features an integrated Universal iPod Dock, auxiliary in, four Odyssey speakers with 6-watts-per-channel, a remote control with iPod menu navigation capabilities, interchangeable trim rings, and can be powered by six AA batteries. The JBL On Stage 3 will be available in black or white when it is released in October;…