The sony 6 disc I have is as loud if not louder than the Ford speakers can handle. I'd guess any reputable brand of aftermarket hifi will easily fill the interior of the car. Thing is a new HU is usually a slippery slope to new speakers which is always a good thing!
Speaking of which, anyone got any ideas on the speaker types, dimensions and tested replacements that would improve the sound quality. I find the door mounted tweeters a bit underwhelming and prone to crackle, and the main woofers a little lacking in quality as volume goes above 10.Edited by: Andymac
2005 Focus C-Max 1.8 Petrol Ghia + Sony 6 disc, 2007 tail lights, Led bulbs all over and HID front fogs.