Hello, I am a "newbie" with SONOS. I have not bought one but know I want to. I am not sure if I need the Connect or Connect:Amp? My situation is; I have a home with built in speakers (installed by the builder two years ago). I have a main "socket" on my second floor with an RCA and IR plugin for the speakers. I have 2 speakers on the first floor and basement and both floors have a control for power, volume, and source for the speakers. I am not sure what all of this means. Right now I play music over my computer but I can plug my iPod or smartphone in with the jack and play music. I want the ability to play music from my device anywhere but I don't know if I need the amp. Any suggestions? Thank you.