On 6/19/2014 9:19 AM, Tom Fine wrote:
> Bottom line, a modern audio system shouldn't need a crazy dedicated
> power plant unless there are regular fluctuations in power line
> frequency and regular spikes and dips in voltage. I'm not
> underestimating the incompetence of power companies, these situations
> are definitely possible. It's also possible to have insurmountable hash,
> for instance in a space shared with an industrial welding company. But
> it's not a common problem.

There's also television; I had to clean up some gear for a club that was 
half a mile from a powerful UHF station. In homes, there's also garbage 
from SCR light dimmers, which have become ubiquitous.

Then there's the internally generated RFI from diodes in the gear's 
power supply; careful choice of diodes, use of snubbers and bypassing 
can mitigate that.

Peace,
Paul