8 ohm Dual woofer speakers... How?

So tell me, How are the Dual Driver Speaker models actually 8 ohm impedance? Models I have owned are actually Dual woofers and are wired in Parallel so they get to a 4 ohm resistance.

However most specs say on all these models 8 ohm nominal impedance, and the newer versions I noted actually state " 8 ohm compatible" meaning what? They realize they are not really 8 ohm measured? I have actually taken an ohm meter to these speakers personally and come up with below 4 ohm somewhere around 3.8 ohm and lower on average throughout virtually all dual driver designs, I know this is not the most accurate way to get a impedance curve, but you would have to figure it needs to be at the least a 7 ohm reading to say its an 8 ohm speaker or am I missing something here?

Seems somebody needs to reveal Oz behind the curtain here.

Thanks