Phantom Premier vs Phantom I

[struts]

The last four digits form N48 is 4U11

Great, thanks!  And the model number?  (at least on mine it is printed on the bottom of the speaker)

MX207 4500w opera 
stock id MX068CN/B1

Many thanks @djredeye @scotthar @LiRnCHO!  Your inputs give us a great start on trying to figure this out.  I am collating all the information in a Google Sheet.  As we are able to gather more data we might be able to figure out the points in time (i.e. week of manufacture) when key hardware revisions were brought to market.  I will open a separate thread to gather this info from the broader community, with enough datapoints I am hoping we will be able to figure this out.