Hello. I need help in installing a good sound system in my 850 T5, sound should sound at least like the S/V/C70 with High Performance Dynaudio, it should stay as original as possible, but speakers can also be other brands. In my 850 are no speakers, no radio, but the cable is already installed original, but has no external amplifier inside. Is it true that the LS should be in dashboard tweeters, with front doors midrange, rear doors woofers and at the rear midranger? Which original Volvo Radio has an internal amplifier? Do you need an external amplifier if you would use the Volvo SC-9 radio or a radio with 4 times 50 watts to achieve the sound of the above mentioned vehicle? Which LS set would be best for my 850? At ebay many are available, but never complete, it is only for front doors or so. MfG and Beautiful weekend I wish you.