Connecting two devices to one audio system (I am a 100% audio/visual noob!)?

An AV Switch is the better choice and is what you need. A "Y" splitter only gives 50% of the original signal to the audio system and heven help you if you turn on both the BluRay player and DVR at the same time A switch isolates the 2 sources so they never see each other Try monoprice.com for inexpensive switches.

RCA cord with Y plugs on it or an audio switchbox. Easy enough.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.