I can't get a straight answer from anyone. I'm running a 200w Volvo OEM amp on the HU 613 with factory speakers, not sure if they're the premium ones or plain old. I've thought about putting some Alpines or Bostons in, but don't want to change out HU613 or the amp. Electronics superstores tell me I need additional (expensive) wiring harnesses to work the speakers without distortion. Is this true? Should I just try to go to dealer and install premium speakers? I'm driving 2001 V70 2.4T, which I love. Just want better sound for long trips.