rflmota

I own a Mercedes E-Class W211 standard equipped with AUDIO-20 and subsequently updated to the system COMAND APS audio system with Logic 7 HK. Everything worked perfectly until recently replaced by the COMAND APS navigation and audio system from Kenwood and I got some problems with the audio, specifically lost a lot of 'power' in low frequencies coming from the subwoofer. Someone tell me know what might have happened to that?

Sorry my poor English and thanks in advance for the help