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Well, I thought it was kind of weird that you made that decision in a thread titled "terrible hum after adding dedicated lines". You know, like I get hum with the complexity of three AC circuits so I will add five more and make it better. I am probably the only one on Audio Circle who thinks less is more when it comes to dedicated AC lines.About 10 years ago, I put two dedicated 15 amp lines in my listening room before I moved in. Back in those days I believed everything I read on the internet, so I knew that I had to have at least two lines. One for analog and one for digital. Or, one for source and one for power. No matter how much I tried I could only get good clean sound using one single line. Everything plugged into the same line sounded better and quieter. It's still what works best for me, even though the general internet wisdom proves otherwise. Maybe my situation is unusual. Maybe my system is too modest.Wayner mentioned simplifying what we say and how we say it if this is to be a useful teaching thread. I say add up the amperage that you need for your audio system, and then provide a single dedicated line of that current capacity for the entire system. It all gets connected together anyway, so why not plug it into one single dedicated line?Too easy?
....................................I am probably the only one on Audio Circle who thinks less is more when it comes to dedicated AC lines....................................Wayner mentioned simplifying what we say and how we say it if this is to be a useful teaching thread. I say add up the amperage that you need for your audio system, and then provide a single dedicated line of that current capacity for the entire system. It all gets connected together anyway, so why not plug it into one single dedicated line?Too easy?
Andy you might be having the same problem as doctorcilantro but minus the added noise from a bad dishwasher. It's actually more an issue with the way some audio equipment is made, than anything else.
The basic idea is to shorten your equipment's path for communicating ("equapotential") instead of picking up noise and ground potential changes by commincating through the sub/breaker panel. Once that starts you got problems with multiple paths and influences.
Then again, if you stick rigidly to the concept that:* mains earth is connected to the case of each component, to ground it (for safety), and* signal earth never touches the case... you do not get "ground potential changes communicated through the sub/breaker panel".This needs to be for every component in your system.Regards,Andy
What I said covers that Andy, except turntables may not work right , and balanced cables like ground.
Good idea if all audio equipment that is designed to be connected together by ICs was designed and built that way.Jim
Can you summerize it some? That old thread is endless.
You've confused me there, SA as:1. The mains power on a TT goes to the motor. There is no connection between the cartridge wires and the motor wires (at least, in my LP12, anyway! ) So mains ground doesn't come into it.2. You said "Balanced cables like ground" - but surely signal ground provides this? (You don't have to use chassis ground?)Regards,Andy
Signal and chassis grounds are directly connected in a lot of equipment, so there is no difference... see figure 1ahttp://www.rane.com/note110.html
Turntables have to be connected to ground, not from the motor. You don't want big differences in potential in this situation, not with this sensitivity.
