This is excerpted from an article written by someone who installs high-end sound systems in cars:
"One more track I had to hear was Alison Krauss' "Oh Atlanta," from Now That I've Found You: A Collection (Rounder). This is the song I've used to tune 25 of our shop's cars that have won sound-off world championship titles. Culler's system had a hard time reproducing this track, especially at high volume. At moderate volume, Krauss' voice was a little harsh, though the band's stringed instruments provided very nice detail. The soundstaging and imaging were still biased and shallow, but overall tonality wasn't bad."