Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

I am putting two 120w alpine 6x9s in my parcel shelf and my dad says that its better just wiring them up to my head unit rather than going through an amp. What would you recomend? Im not too bothered about a sub but maybe after other mods av bin done i will get one.
thanks

yea can wire them up using the rear speaker cables, and it does sound ok, but it u want better quality and more volume then u will need an amp