In our experience the Brose Drive S
Mag (2.1) is comparable but if anything just slightly louder than the Brose Drive S
Alu (1.3). Both are quiet motors and if you are hearing a night & day difference between the two it is likely you have a noisy motor which can be replaced under warranty.
Perception is individual, granted - and ultimately these are electric motors which do make
some noise. However if you feel you have a noisy motor compare it with other bikes by riding at around 90rpm-100rpm (high cadence) uphill - you will hear a noisy motor really start to whine and change tone whereas a normal motor will simply get a little louder.
Look back on this thread to
#80 and
#114 - both should give you some direction on this. Bottom line, we're not putting a time window on this so feel free to continue to ride and compare your Levo with others in the meantime.