Originally Posted By: Quattro Pete
The OEM has the advantage of being able to actually test speaker components and adjust crossovers and EQ at the time when the car is being designed. The same cannot be said about aftermarket speaker manufacturers. So, just dumping in aftermarket speakers in place of the OEM ones often can lead to undesirable results as the new speakers may not align well with the available enclosures, crossovers, factory programmed EQ, etc.
Good sound is achieved when the speakers react well with the environment in which they were placed. And only the car mfg knows that environment in advance. Aftermarket speakers are designed to fit variety of vehicles/environments and as a result may not fit any particular environment exceptionally well. Can you get it to sound great? Sure, but it may take a lot of tweaking, and enclosure redesign that most people have no patience or willingness for.
Bingo. This is key and makes all the difference IF the OEM wants to do it right.
I have the OEM Volvo/Alpine/Dolby/Dynaudio center-channel, surround-sound system in the sled. Amazing sound even after 17 yrs. Volvo was the first OEM to have Dolby-certified surround-sound in a vehicle 17 years ago. Not sure what they're up to or offering these days.