Different sets of headphones use different technology to accomplish this, with many offering «channels» optimized for specific bands of frequencies. (howtogeek.com)
Myself and a friend were discussing something very similar to this... we heard it in a song played on a very popular christian radio station, but I've heard it many other times in a few specific bands. (redeeminggod.com)
After treating the cells with 20 μM of EGCG for 0, 12, 24, 48, 72, and 144 h, strong unmethylation - specific bands for all four of the genes began to appear at 48 h (Fig. 3A) ⇓. (cancerres.aacrjournals.org)