Hello, I have the HU-603 radio system in my V70II. Since I would like to feed the Teifbas area, I ask the forum whether it is possible to connect an external power amplifier to it. I have the power amplifier, it also has a low bass filtering. So I would have to get the audio signal out of the radio, for example, to hang it on the chinchein entrances of the stage. Then I build a subwoofer in the trunk floor and everything should be chic … Who has information, if this with as an ex-technician, I am not afraid of deeper interventions. So, let it out the secret! 🙂 Thank you and greeting Frank