Just found on youtube that the iLoud Micro Monitors make a low humming sound at 50 - 60 Hz from their ports
Wwenze's own review from many moons ago
Sound quality wise, iLoud should still have the upper hand. Remember that this port chuffing issue is present because they went that low when no other (of the same size) dared to. Genelec started jumping ship at 80hz, can see the steep drop. A2+ (and I'm guessing YU2 as well) starts the steep drop even earlier ~120hz.
The good news is if you use with a sub, then you can crossover at ~65-80hz and remove the work for the iLouds and avoid the chuffing. With the other 3 speakers, you probably have to crossover at higher frequencies at 100-150hz maybe?
So the iLoud's port chuffing is not that serious an issue to me if you have a sub. At least that's my 2 cents. But of course, ultimately you need to feel happy with your purchase la. Just be aware that there're compromises to be made when the speakers have to be this small.