The Hertz Audio Cento Pro CPK 165 PRO car audio system includes the CP 165 woofer and the CP 25 tweeter with Tetolon dome and 25 mm voice coil, features ensuring a very wide and linear frequency response. The CP 25 employs the “Center Tuning Duct” technology: the tunnel at the centre of the powerful Neodymium magnetic circuit, ensures low-temperature air exchange between the dome and the rear loading chamber, perfectly tuning the acoustics. The resulting very low resonance frequency is also functional for the woofer crossover point, elevating the sound stage. The sophisticated design of the mobile group and suspensions of the CP 165woofer, featuring a 60Hz calibrated resonance frequency, ensures a medium-low power with excellent punch, making listening to rich low frequency genres a unique experience. The basket is consistent with the family-feeling of the Mille line with the addition of damping and protective rubber. The cone material is inherited from the Mille Pro, as well as the suspension butyl rubber and the Tetolon fibre of the tweeter dome. These materials have excellent damping and lightness characteristics, producing a balanced sound without resonance peaks. The gift box includes the woofers grilles made of a combination of metallic mesh and high resistance ABS plastic frame. The combination of these two elements allows the user to customise the installation with a sophisticated and elegant design.