Instead of trying different recordings which vary from recording to recording, why don’t you get a Testone CD or if you subscribe to TIDAL, you can use this Testone album called “audio line up test tones”. You can listen to a frequency at every hundred hertz for approximately three minutes long. While the frequency is running, it gives you time to move your speakers around. I like running 30 Hz and then running 20 Hz. It’s amazing how many speakers say they’ll go to 20 Hz but you here next to nothing versus playing 30 Hz and then 40 Hz and then 50 Hz. The towns keep getting louder as it’s easier for this speaker to reproduce the sound.Try it works great!