VSonic VSD1 Dynamic Noise Isolation Earphones Earbuds VSonic VSD1 dynamic noise-isolation earphones earbuds headphone Priced at almost 1/3 of the price, VSonic claims that it retains almost 80% of big brother GR07 Larger soundstage and slightly less bass response than VSD1, making it perfect for classical and jazz music Total burn-in period needs to be 80 hours