One of the advantages of the HP Gen8 MicroServer is the low noise level, however the server does suffer from some case reverberation which has a negative impact on the noise levels. Especially bad if the servers are in your lounge or home office.
The problem is easily remedied by placing some foam pads inside the case, the kind of foam that the server arrived in its box is ideal. Cut a couple of squares and make it sit just proud of the server case so that when the lid is put back on it squashes the foam to reduce the vibrations of the lid. A simple but very effective solution.