Re: Why do my new aftermarket speakers sound worse than the factory ones?
Car audio is a horrible game to get into. That stuff will eat money almost as fast as fixing a broken 6.0! lol
The reason it sounds like crap is fairly simple. Ford spent a buttload of money on testing and diagnostics to get a decent sound out of that factor unit. However, once they got it, they just slapped that setting into all of their head units, so the price per vehicle was negligible. You now have an aftermarket stereo with nothing set. No matter what, it would sound worse than factory. Read up on setting speaker timing and download a good reference disc such as "Sheffield/A2TB test disc", or the "Ultimate Demonstration Disc" from the Chesky Guide to Critical Listening. Armed with those, you'll be able to get better than stock sound fairly easily.
Now, to REALLY get good sound will take a lot more work. You need to understand that those factory speakers were designed for the truck. They don't require damping material behind them, or special materials in your door, to sound good. That high quality aftermarket speaker can definitely sound way better than the stock ever could, but it will take LOTS of work.
As for how the "better" speaker isn't as loud....well, there are a lot of reasons that could be true. Might be due to impedance, driver suspension stiffness, weight of the cone, and so on.
2004 Excursion 6.0
New HPOP/HPO system o-rings; Updated standpipes and dummy plugs
EGR delete; Rebuilt oil cooler; CCV collection mod
VR Black Diamond head gaskets and ARP studs
Oil and coolant bypass filters; Shell EC-1 coolant
Rebuilt turbo; 250 amp alt; 6000 watts of brain scrambling
One giant 240 pound English Mastiff riding shotgun!