Behringer MicroHD HD400 Review and Audio Test

How can I eliminate ground loops in my home studio?
0:00 Introduction
0:27 My ground loop problem
0:41 Recording chain in the studio that causes a ground loop
1:28 Hearing the ground loop
1:44 Ground eliminated using HD400
2:06 HD400 audio tests
2:24 Direct guitar without HD400 (audio sample)
2:34 Direct guitar with HD400 (audio sample)
2:44 Direct bass without HD400 (audio sample)
2:54 Direct bass with HD400 (audio sample)
3:17 Inside the HD400: 2 Transformers
3:46 Conclusions
4:53 Outro
5:20 Recording chains used for audio samples with and without HD400