Q: I have a 2006 volvo xc70 and was wondering if I could add amplifier to my existing system, currently I have hu-650 installed in my volvo,

A: Yes, you may add amplifier to your system, there is a power cable already there under the passenger front seat so you don’t need to do any modifications to your wiring, all you need is amplifier and harness that connects amplifier with radio and it also plugs into the connectors that go to the radio that way signal is going via amplifier, there few different part numbers if it goes to these amplifiers and all of these will fit your volvo here are few 8666630 (p-300), 8673135 (p-200),  9472301 or 8633972 all of these amplifiers will fit your volvo xc70 2006, it will also fit any 01-08 volvo s60, v70 01-07 and volvo s80-99-06, if you would like more info I have provided direct link to such amplifiers,

click here to see more info on volvo 2006 volvo xc70 amplifer