Audio Upgrade to BMW Z4 2005

After listening to this car we realised why the customer wanted to upgrade the sound system.  The customer opted for JL Audio speakers which consisted of VR525-CSi front components and VR690TX 6″ x 9″ speakers for the rear.  The subwoofers used were Hertz Energy and these were placed into a custom built enclosure under the rear shelf and then covered with a trim panel so they couldn’t be seen when the boot was open.  The power for all these speakers were from 2 Audison SRx amplifiers, an SRx4 4 channel amp for the speakers and an SR1D mono block amp for the 2 subs.