Before mixes make it to the car or the stereo or the clock radio, I test them on the washing machine.
With a newly rendered mix playing on my computer speakers, this position is off-axis and and above the near-mono sound source. It reveals imbalances and other problems that aren’t immediately apparent on my carefully placed stereo studio monitors. I’ll go back and forth between the monitors and this speaker/position combination several times when I’m working on a mix before it’s ready to test elsewhere.
I’ve spent a lot of time here in the past month, with more to go. The good news is that I have one song sounding great everywhere, and can apply some of what I’ve done there to the rest.