cbm, cmt, htm, etc.
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cbm, cmt, htm, etc.
I think it is like this....
Compact Bookshelf Monitor
Compact Mini Tower
Home Theater Monitor
And I think the number is the millimeter measurement of the driver(s). 170mm= ~6.5 inches. Two of the drivers in the 340. 4" is ~100mm times 2= 200.
Both Quinn and Curtis got it right....