So I hooked up my brand new A51 (thanks tduski!) and immediately got a ground loop hum. Sigh! After about 20 minutes of playing with cables and outlets and plugging and unplugging gear I read the manual (shock!) and found that setting the "ground" switch to "lift" fixed all my problems.
So, um, ok, what exactly does "lift" mean? Does it mean that I really need to fix something in my house wiring and this is a temporary fix? Should I try to get the switch back to normal?
Here's what I get on normal:
- With the speakers connected and no input connections, no hum.
- Connect any input, hum on that speaker.
- Unplug my entire HT from power (so no unit gets power except amp), still hum.
- Move amp power to a separate, dedicated circuit, still hum.
I have a sat -> sat rcvr -> rcvr -> amp connection, but i figured with the power totally off on both rcvrs that would cause that to go away. Perhaps not, I'm no electrician Should I try removing the sat connection from the wall and see if it all goes away?
Do I need to take action to fix this, or should I just leave it be with "lift" set? Thanks!
-Mike
So, um, ok, what exactly does "lift" mean? Does it mean that I really need to fix something in my house wiring and this is a temporary fix? Should I try to get the switch back to normal?
Here's what I get on normal:
- With the speakers connected and no input connections, no hum.
- Connect any input, hum on that speaker.
- Unplug my entire HT from power (so no unit gets power except amp), still hum.
- Move amp power to a separate, dedicated circuit, still hum.
I have a sat -> sat rcvr -> rcvr -> amp connection, but i figured with the power totally off on both rcvrs that would cause that to go away. Perhaps not, I'm no electrician Should I try removing the sat connection from the wall and see if it all goes away?
Do I need to take action to fix this, or should I just leave it be with "lift" set? Thanks!
-Mike
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