> If you ask audiophiles online they will swear up and down that a cheater plug, balanced cables, or optical isolation will fix it - that will not fix it.
Lifting the ground on my studio monitors absolutely fixed my noise problems. I run them off a MiniDSP 2x4HD, so other sources like EMI aren't really a factor.
The problem I have with a double conversion UPS is that it isn't an ideal sinusoidal source. It implies it is on the tin, but when you've got protected loads with PWM power delivery slamming around 1+ kilowatts, there's no way to guarantee a smooth waveform with a typical ~2500VA unit. Directly passing through to the grid could provide cleaner power under the most transient conditions.
Lifting the ground on my studio monitors absolutely fixed my noise problems. I run them off a MiniDSP 2x4HD, so other sources like EMI aren't really a factor.
The problem I have with a double conversion UPS is that it isn't an ideal sinusoidal source. It implies it is on the tin, but when you've got protected loads with PWM power delivery slamming around 1+ kilowatts, there's no way to guarantee a smooth waveform with a typical ~2500VA unit. Directly passing through to the grid could provide cleaner power under the most transient conditions.