One is full with cone, coil, magnet, etc. and is connected to an amplifier.
One is identical to the one above, but not connected to an amplifier.
One has an identical cone, basket, and spider, but with no voicecoil or magnet and is not commercially marketed as a passive radiator, but is simply a normal woofer with the coil and cone removed.
According to the dBDrag classification system, how many woofers is this: 1, 2 or 3?
Since my other post strayed off topic and was not answering my original question, I have deleted it and would like an official answer on the above.
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