Loud hum on S.E.X. 3.0

[Paul Birkeland]

You can cable everything up, then start by removing the device furthest from the SEX in the chain, then the next, then the next, until the hum goes away.  Let us know which device that is (it could be your computer).

I do not recommend taking the pot out.  If you turn it up all the way, it just becomes a pair of 100K carbon resistors.

[roycruz23]

My conclusion is;

1. I turned on the S.E.X. 3.0 and listened without any input or attachment (RCA cable for this matter) and
    it was quiet (no hum).

2. I inserted/attached R/L RCA jacks from one end of the RCA cable, the other end IS NOT connected to
    any source at this time, it was quiet (no hum) when both jacks are inserted and secured, the only
    time I would hear the hum is when I am inserting it.

3. I noticed when I insert/attach the other end to a source (any source for this matter and I tried it when the source
    is turned ON and turned OFF), I CAN HEAR THE HUM.

4. I tried to detach/take off the L/R RCA jacks from the source, I noticed the same hum is present when I touch both ends.

Thank you,
Roy

[Paul Birkeland]

Try using your phone as a source.

Are the AC outlets where you live grounded?

[roycruz23]

Yes, wall outlets fits 3-prong plug. I think it is standard here in Livermore, California, U.S.A.

[Doc B.]

Is all of the gear plugged into the same circuit?

[Paul Birkeland]

Try using your phone as a source.

[roycruz23]

S.E.X. amp is the only one plugged into the wall. Computer, DAC and Link are all powered by a power bank (DC).

I noticed S.E.X. makes a hum when attaching/connecting the RCA cable jack on the source (either ON or OFF).

It also makes a hum just by touching the other end of the RCA cable.

[Paul Birkeland]

Try using your phone as a source.