I have some suggestions or recommendation for future builds of Eris Sub 8 and it's series.

First of all, I noticed that the main transformer causing a relatively big burmming noise. This noise can be detected when everything is quiet, but it was loud enough to be annoying even if my main computer is running. I disassembled the sub and noticed that the screws of transformer were loose. I don't know if it was caused by handling issue during transportation or manufacturing issue, but gluing the screws could fix / prevent this issue easily and cost effectively. I don't know if this was a unique situation or others experienced with the same issue, but I gently tighten the screws and the brumming noise gone.

The second problem I found is a switch on/off transient issue. This could be easily fixed by applying a small, 4.7 - 22nF / 600V capacitor + 500KOhm resistor in parallel of the main switch (between the two contacts). This used in many high-end systems to avoid switch-on/off transients.

The same must be added to ERIS studio monitors as well!

Future improvement could be a slow-switching on (so-called cold-start) circuit which could help reduce the stress to transformer and the whole power line. Some times, my UPS detecting that I'm switching it on...

Last recommendation to add a power outlet to Eris Sub and only switching on the SUB (of course it could be selectable) if the power outlet having a power consumer. Couple of Euros device can do this, but would be awesome to have this feature. Especially when users having Eris 3.5, 4, 5 monitors...