when i change any thing in my system i normally play a few songs to see how things have changed
Yello Live in Berlin song called "Magma"
if you watch the you tube video of this live performance you can see the left & right presentation of the horns in your system you should be able to hear this in your soundstage you should be able to hear and visualize the players in the left and right on the stage, also the power in the drum beat at the end of the song should sound weightly but not boomy.
2nd song i use even though i dont care for Madonna is her song Vogue, when played there should be a wide soundstage outside the outer edges of your left and right speakers the finger clapping should be outside the left speaker and the drum beat should present itself on the outside of the right speaker with her vocals directly centered.
3rd song "Hey Now" from London Grammer, just for the overall presence of her voice, should be room filling without any harness
4th song Yello "vanishing of Peter Strong great song to play loud center presentation of voice should be erie sounding