Alright, so as some of you know I've been dealing with a ground loop for some time now..
I stepped back from the problem as I had plenty of time to deal with it.. I finally did the following:
- I've moved my Receiver and Computer to a different location that would isolate them from my other components.
- I have removed ALL connections other than the VGA connector from my TV(the monitor as I am doing this from my media center location)
- Connections:
TV<->Computer : VGA DBsub
Computer<->Wallin's : RCA to 1/8" jack
Computer<->Receiver : RCA to 1/8" jack
Receiver<->Wallin's : speaker wire
TV, Computer, and Receiver are all disconnected from anything other than the power and signals required for SynRTA Freq Response measurement.
TV, Computer, and Receiver are all powered by the same outlet by use of a surge strip.
I read through some threads, saw a quick fix could be a cheater plug, Cheater plug placed on computer(only 3 prong)... NO FIX
Soundcard removed from Computer and use of onboard audio... NO FIX
Tried both 'A' and 'B' Speakers from reciever... NO FIX
In my previous thread I've stated that a loop back on the sound card shows no sign of 60Hz harmonics..
AS SOON AS A CONNECTION IS MADE TO THE RECIEVER 60HZ and Harmonics appear...
Someone help me.. now its becomming obvious there is some issue with the reciever or Wallin's jig... I believe I tested using the wallin's without the reciever in the loop.. I'll double check on that..
If it is my receiver.. what do I do?
Note:
I noticed that when using DSP settings on 'A' Speakers, 60 Hz and Harmonics have small bandwidths essentially (with the low resolution of SynRTA) directly at 60Hz or the harmonice; however, with 'direct' setting the 60Hz peak has a much larger bandwidth almost appearing to span 40-80 hz..
At this point I'm ready to throw my enclosure in my car and drive to anyone's house that has a measurement setup that performs properly.. you just have to promise not to make fun of my cabinet building proficiency - haha.
I stepped back from the problem as I had plenty of time to deal with it.. I finally did the following:
- I've moved my Receiver and Computer to a different location that would isolate them from my other components.
- I have removed ALL connections other than the VGA connector from my TV(the monitor as I am doing this from my media center location)
- Connections:
TV<->Computer : VGA DBsub
Computer<->Wallin's : RCA to 1/8" jack
Computer<->Receiver : RCA to 1/8" jack
Receiver<->Wallin's : speaker wire
TV, Computer, and Receiver are all disconnected from anything other than the power and signals required for SynRTA Freq Response measurement.
TV, Computer, and Receiver are all powered by the same outlet by use of a surge strip.
I read through some threads, saw a quick fix could be a cheater plug, Cheater plug placed on computer(only 3 prong)... NO FIX
Soundcard removed from Computer and use of onboard audio... NO FIX
Tried both 'A' and 'B' Speakers from reciever... NO FIX
In my previous thread I've stated that a loop back on the sound card shows no sign of 60Hz harmonics..
AS SOON AS A CONNECTION IS MADE TO THE RECIEVER 60HZ and Harmonics appear...
Someone help me.. now its becomming obvious there is some issue with the reciever or Wallin's jig... I believe I tested using the wallin's without the reciever in the loop.. I'll double check on that..
If it is my receiver.. what do I do?
Note:
I noticed that when using DSP settings on 'A' Speakers, 60 Hz and Harmonics have small bandwidths essentially (with the low resolution of SynRTA) directly at 60Hz or the harmonice; however, with 'direct' setting the 60Hz peak has a much larger bandwidth almost appearing to span 40-80 hz..
At this point I'm ready to throw my enclosure in my car and drive to anyone's house that has a measurement setup that performs properly.. you just have to promise not to make fun of my cabinet building proficiency - haha.
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