I bought a pair of the first couple hundered produced and still have them.
I don't know anything about upgraded woofers.
I do have mis-matched voice coil dust covers because I had to replace a woofer when the speaker was about five years old. I had taken my speakers to the shop and they said the woofer was fine, stators needed replacing.
My wife and I could clearly hear it was the woofer blown. Fustrated I contacted Jim Power at M/L and he sent me an old woofer used for early testing off the closet shelf when I ordered new stat panels from him.
It sounds the same, with a flash light you can see the difference.
The upgrade most encouraged and done, is the new board for "auto-on and stand-by" of the power supply. My speakers are always on (unlike the Aerius-i), I unplug them if I know that I won't be listening to music for a month. I had them unplugged for a whole summer while I painted the house once - just to busy.
The original Aerius is a sealed box design.
Correct me if I'm wrong, I think the Aerius-i is a ported woofer.
This would mean the woofer/bass unit drivers are NOT interchangable.
