This is where good ears are necessary, and most costumers won't even notice. But this can be an issue for some Hi-Fi enthusiasts that can hear it with ease, and we need to respect that some find it annoying. To best come around the issue, we have made some recommendations.
Option 1.
The buzzing sound is often related to electrical noise, so to make the annoying sound disappear we need to isolate what electrical device the electrical aura comes from. The best way to do this is by removing other devices near the Lemus audio system, and specially near the SM450.
Small power converters or thin 230 volt power cables can easily generate enough electrical noise around the cable for the SM450 to amplify.
The best solution to this is ensuring you are putting the noise generating device as far away from the SM450 as possible, or spend some money on shielded cables.
Option 2.
If you have an record/LP player, make sure this is grounded to the RIAA. Else the the pick-up will keep picking up noise that is high enough for the SM450 to register.
Option 3.
Use shielded phono cables.
Option 4.
If you have the Lemus remote then set volume to 30% or lower, or choose HDMI input on the remote when done using AUX.
Option 5.
If you have the Lemus device plugged in to a power power strip, set the Lemus power inlet in the first slot of the power strip. Old light bulbs or cheap power converters can generate enough noise to disturb the Lemus device attached to the same rail.