I took the test several months ago with my nice DAC/amp headphones and got 5/6. Just tried again on my phone and got 0/6. And at the end it asks you what you we

I took the test several months ago with my nice DAC/amp headphones and got 5/6. Just tried again on my phone and got 0/6. And at the end it asks you what you were using. Seems to me like the experiment has value.