I have been using these (and also the E4.5) for two years without any problems. Connected via the balanced 6.3mm jacks. Important: In most cases the hum is not caused by the loudspeaker but by a so-called hum loop (ground loop). This means that the 50Hz of the power line become audible as hum through a ring connection via the ground of the various devices (amplifier, loudspeaker, etc.). In such cases, the ground must be interrupted at a certain point (e.g. with a ground isolating filter or adjustable on the unit itself). Information on this can easily be found on the Internet. A second important source of hum can be so-called interference. This is caused, for example, by unbalanced audio cables (e.g. chinch cables) running parallel to a power cable or in the immediate vicinity of transformers. Whenever possible, balanced audio connections (e.g. XLR cables) should be used, as the audio signal cannot be disturbed so easily.
Rocksresort Laax: win a stay for 4 people
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