Only if you previously correctly connected your player to the preamps ground, and more importantly, only if your ground is good. A lot of time, especially in large house complexes, ground has tons of excess electricity and even AC, high frequency, often in the audible range. So this can be more difficult than this.
I think you're talking about a Ground Loop: en.wikipedia.org/wiki/Ground_loop_(electricity) This results in a "Mains Hum" en.wikipedia.org/wiki/Transformer_hum#Prevention You can prevent or reduce it with a 1:1 isolation transformer.
You're taking about earth leakage. It tends to be prevalent in equipment that uses a switch mode power supply that isn't referenced to ground/earth either due to it being a class 2 device or poorly designed. What you're describing is called a balanced output and is used incredibly heavily in audio production and performance. It's not so much a "trick" but more a sign of cheap consumer equipment. XLR cables and connectors integrate a common ground to eliminate ground hum. Equipment that doesn't reference earth can kill - it's happened on stage many times where performers have been killed.
Only if you previously correctly connected your player to the preamps ground,
and more importantly, only if your ground is good. A lot of time, especially in large house complexes, ground has tons of excess electricity and even AC, high frequency, often in the audible range.
So this can be more difficult than this.
I think you're talking about a Ground Loop: en.wikipedia.org/wiki/Ground_loop_(electricity)
This results in a "Mains Hum" en.wikipedia.org/wiki/Transformer_hum#Prevention
You can prevent or reduce it with a 1:1 isolation transformer.
If it is just a ground loop why does the noise get worse when i use a ground loop isolater?
You're taking about earth leakage. It tends to be prevalent in equipment that uses a switch mode power supply that isn't referenced to ground/earth either due to it being a class 2 device or poorly designed.
What you're describing is called a balanced output and is used incredibly heavily in audio production and performance. It's not so much a "trick" but more a sign of cheap consumer equipment. XLR cables and connectors integrate a common ground to eliminate ground hum.
Equipment that doesn't reference earth can kill - it's happened on stage many times where performers have been killed.
Google Mains Hum buddy