Best answer by jgatie
The Connect:Amp's main purpose is to amplify a set of external passive speakers (hence the "Amp" name). If you only need to send the output from a turntable to a pair of Play:1's, you do not need a Connect:Amp (though it will do it). Save the $$ and get a Connect.
The connections would be Turntable->(internal or external pre-amp)->Connect Line-In. Then choose the Line-In source for the Play:1 room or set the Autoplay room for the Line-In to the Play:1 room name in Settings->Room Settings->(Connect room name)->Line-in Settings, which will make the Play:1s the default for the turntable. Then drop the needle.