Originally Posted by SpectorV
it used to be based on the Watts (mach 460 = 460 Watts which is BIG TIME!)
It still is..
The options when purchased are Ford Audio not sure how many watts, Shaker 500 and 1,000
Ford Audio comes with I guess 4 or 6 speakers no sub.
Shaker 500 is a 500 watt audio system powering the two in door subs (bottom of both front doors), it consists of 4 speakers, 2 x 2 way speakers in each door, a low range, and a high range speaker all in one cone, lastly, in the rear it features 2 regular speakers on each side. This gives you a grand total of 6 speakers + 2 Subs or in Ford marketing terms 8 speakers total.
The Shaker 1K I believe includes the same amount of speakers, but in addition adds a trunk mounted subwoofer with an amp.
Out of curiosity a few years ago, I asked about converting a 500 to a 1K, I was told it was not possible due to a different wiring harness.
I've read on the net where people have switched them out, but overall I heard it's not worth it.
The best upgrade, I know, and have heard of from the 500 is to switch to an LCD head unit.
The Pioneer App Radio is one to consider.