Saying they all work the same is like saying all wake board boats produce the same wake.
Every sub manufacturer designs their sub for a different sound, and with different power requirements in mind, as well as different enclosure volumes to achieve that desired sound. But with enough searching, you will find subs that require about the same power and recommended enclosure volume.
As Polarbill pointed out, It's always better to exceed and amp's rated RMS, by a bit, then to be underpowered.
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