Alex, I have a APC RT UPS which is a regenerator and UPS in one. I use it for on site recording as you never know what you get from the wall socket. Dimmed lights, PA and all sorts of other devices like air conditioning and refrigeration are plugged in randomly at those venues. For especially bad situations, the device has enough charge for operation of the recording devices and mix board for about 11 hours. In the last 15 years, I have only needed the DC operation once. The APC RT successfully „fixes“ these problems - at least in the context of a mixing board, multi channel ADC/DAC, PC for recording and kilometers of microphone cable. Perhaps the problems in the recordings are not as prevalent because power amplifiers are affected not small signal devices? I do not know.
This thread is many years old and it seems that no one that has the problem gets universal relief from the „PurePower“ or other device. Seeing how Alex introduced the idea that power cords between the PurePower and mains change bass shows me that this is not a „solution“ but a deficiency in the PurePower device.
If I did have this problem of dramatic variable sound quality due to grid influences, I probably would make notes of when it is not so bad and move my listening to those times.
In any case, my personal opinion remains. This phenomena should be solvable by „better“ power supply design. Until we know what causes the problem, there is no way to define better. As we leave coal and atomic energy, I suspect that things will get worse - maybe so bad that some smart people will do something ingenious. |
|