Hi, I'm considering to add the 9" subwoofers which are optional in my C70. Mine has a SC901 radio. Related questions for which I'm loking for a link or hint: - where's the amplifier located? - whare would the subwoofer amp go? - anybody mounted [non-volvo] subwoofers in this type of car? - how to connnect the subwoofer amp? Regards & Thanks, Wytze