Rerurn to Romy the Cat's Site
In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Does input ac affect output of PurePower regen?Posted by PurePower on: 7/27/2018
We still maintain that the output is totally isolated from the input AC - which after all is the reason for a battery pack - to make sure the DC bus is always stable. We have done tests again and again in which we switch from battery to utility and back while challenging listeners to identify when the switch occurs.
They don't succeed. (Of course Romy may be an exception - we haven't tried it with him.)
There is another exception. If we pull the plug literally - instead of switching the AC line breaker on and off - the difference is sometimes noticeable. The explanation is straightforward. When the plug is pulled the ground is interrupted. Grounding can be a very significant factor is system sound. And we must admit PurePower is not in the ground line conditioning business. We try to make sure our ground schemes don't contribute any ground problems - but our responsibility is the quality of the AC sine wave and the current sine wave on the line and neutral wires. Each audio installation needs equal care in maintaining good grounding practices. We know because we have been unfairly blamed for many ground loop problems - and every time without fail when the ground loops are found and eliminated the noise goes with them.
So sometimes grounding imperfections have more subtle sound consequences - and may explain apparent differences that are attributed to incoming AC affects. It is instructive to draw a circuit diagram of an audio system separated into the audio signal path, the AC power path and the ground wiring. The ground is by far the most complex.
p.s. If you have ground loop,issues we can point you to some excellent papers on ground loops and audio system ground problem diagnostics.Rerurn to Romy the Cat's Site