I have been using balanced ISOs in my living environment for the past 5 years; currently 1 x 2kVA Equi=Tech Q type and 2 x 250VA in a single chassis. I recently completed a rebuild in a taller chassis, to add the second 250VA transformer. The large iso has an oversized core, is very immune to saturation from DC on the power line, and as a result, runs quietly. I've tried other isos that were very noisy.
Current setup: http://img.villagephotos.com/p/2003-5/191557/2083672
Past versions: http://img.villagephotos.com/p/2003-5/191557/1741050
.
Current setup: http://img.villagephotos.com/p/2003-5/191557/2083672
Past versions: http://img.villagephotos.com/p/2003-5/191557/1741050
.