Hertz Dieci Series Car Audio Speaker Systems Let You Realize A High-Quality Audio System With The Utmost In Simplicity. The Woofers Employ The Exclusive V-Cone® Profile For Amazing Off-Axis Response And Detailed Mid-High Range. The Tpu (Thermoplastic Polyurethane) Surround Ensures Linearity And Reduction Of Unwanted Resonance, Even At High Excursion. High-Performance Materials, Such As The Neodymium Motor Assembly And The Pei Membrane, Ensure An Extended High-Frequency Range. The Passive Filters Are Found Directly On The Supplied Connection Cables, Along With A Rich Array Of Accessories Increasing The Install-Friendliness And Installation Time.