Although the db521 has a larger frame than its counterpart, the db401, it in fact provides the same maximum power handling (135w) and nominal impedance (4ohms). However, the db521 does offer a lower maximum frequency of 60Hz (versus 85Hz). In addition, the Audio db521 features a .75” liquid-cooled silk/polymer composite dome tweeter, a pole plate heat sink that promotes improved heat dissipation, and a muscular ABS grille that is computer optimized and based on MOMO designs. Cited as offering high-quality performance and long-lasting durability, the Polk Audio db521 is considered an incredible car-audio solution offered at a reasonable and affordable price.
