Audio Effect: Intercom/PA System

Hey guys! 

Looking to turn a recorded VO line into what is the New York City subway car conductor speaking through the intercom to passengers. Trying to mess around with a few effects and trying to figure out how to distort it a little more, make it almost walkie-talkie like since it's coming from a crappy subway car speaker? Any tips to figuring this out? Are there any one or multiple layered effects you'd reccomend? Thanks folks.