will do some serious 1 vs. 2 motor comparisons, and report back.Unfortunately, it will show nothing new, because you don't know, how good these motors really are.
That's why multi motors from same manufacturer always sound different to single motor. When they have flaws, it is not so obvious. They compensate each other.
A real comparison would be, to use a real good motor as comparison (for example from Micro Seiki..)
In Germany I know a few who replaced- for example - the Raven motors, no matter how much (1 or 2...) with really high quality industrial motors and they told me, THAT is an real improvement....