Simplest way to add turntable preamped?

Hello

I have beam gen2 plus sub gen3 and would really like to add my turntable to the set up. 

I’m going round in circles (pun intended) trying to decide between an amp, a port or a 5 with a line in. 

I’ve tried cabling it up to my tv with the RCA but it won’t play through the HDMI arc, it will play via its own input but I don’t want the tv on whilst playing.

A second hand 5 is probably most cost effective but would that work with what I already have? 
 

Also tried combining the HDMI into 1 input into the beam but it didn’t like it. 
 

Many thanks in advance. 
steve