Just play the stuff you love!
Listen to them go through the process. Sure you could put a cdp on repeat playing some burn in track from a Stereophile or Chesky evaluation compilation.You could play "Pink Floyd","Pink",pink noise,pipe organ classics,or "Cosmic Hippo",but really just play what you love.
200 hours is about 8 days straight.Out of a 24 hour day average person has maybe 4hrs max to expend for fun. Time has no refund.
You still here!Goooo!Play those new speakers!#:^)