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Cerwin-Vega uses 2 midrange speakers in the Classic D Series (for
Digital) like the D7 or D9 Models. At first they look like the exact
same 6" midrange speakers but if you take them out, you see two
different numbers. The top midrange is a CM6 and the lower midrange is
called the CM6H.
Could it be one is an upper midrange and the other a lower midrange
(but both are 6" drivers)? Can someone explain exactly why Cerwin-Vega
did this instead on using two of the same speakers?

The D7 seems to be a rare model. I see tons of D5's and D9's for sale
but rarely a D7. The D7 is very similar to the D9 except it uses a 12"
woofer instead of a 15". While it still has lots of bass, it's not as
boomy as the D9 and some consider it a better speaker for a wider
variety of music instead of just "heavy metal" or "rock & roll". They
got a reputation of a "rock&roll" speaker because they are very
efficient (SPL wise), can take a lot of abuse and are hard to beat in
the low frequency output. I've seen many people use the D7 or D9
speakers in Halls or Clubs as professional speakers and they took the
abuse of high power levels night after night with a proper amplifier.
This is above and beyond what most people would do with the speakers.
Sadly most Cerwin-Vega D-Series Speakers are damaged by foam surround
rot or blown drivers with a home amplifier thats driven into clipping
or distortion. Some types of loud music can mask a clipping amplifier
with distortion recorded in the music.