Hertz Mille MPG 165 Pro - Speaker Grille RD The SPM4 mixes audio through

The SPM4 mixes audio through 4 audio transformers specifically developed to achieve very low distortion and highly linear acoustic response

36 mm CCAW double layer voice coil wound on a Polyamide former for exceptional power handling and compression-free re production even in the most demanding musical passages

Neodymium Magnetic group to maximize performance while  minimizing bulk and weight

Massive motor assembly optimized with FEM (Finite Element Modeling) for perfect control under high excursion conditions

which allow one to adjust the sound according to driver position and or personal preference

Hertz Mille MPG 165 Pro - Speaker Grille RD The SPM4 mixes audio throughThe optional Hertz Mille Pro MPG 165. 3 woofer grille designed for the Mille Pro MPK 165. 3 Speaker System is made of die cast aluminium, featuring diamond cut aluminium Hertz logo.