Hi soundroi,
Q1 is hard to answer without the thing in front of me.
Q2, well as it's a rack it implies that you are plugging into another Amp.
IF the 2 units are *grounded chassis* then there will be an earth loop created.
This is a common mistake when linking equipment together.
With high gain preamps not helping the situation.
You have to lift the *Signal common* from the *mains Safety ground*
to fix it. IF you have no idea what is being said then Get pro advice before messing with Chassis earth wiring.
Doing it the wrong way can have fatal conciquences.
The safest/cheapest way to *test/fix* if you have this issue is *cut* the common wire on one end of the audiocable that joins the 2 units. If the hum is greatly reduced then you most certainly have a ground loop happening.
you will then have to deside which way to go.
just something to consider.
Phil.
Q1 is hard to answer without the thing in front of me.
Q2, well as it's a rack it implies that you are plugging into another Amp.
IF the 2 units are *grounded chassis* then there will be an earth loop created.
This is a common mistake when linking equipment together.
With high gain preamps not helping the situation.
You have to lift the *Signal common* from the *mains Safety ground*
to fix it. IF you have no idea what is being said then Get pro advice before messing with Chassis earth wiring.
Doing it the wrong way can have fatal conciquences.
The safest/cheapest way to *test/fix* if you have this issue is *cut* the common wire on one end of the audiocable that joins the 2 units. If the hum is greatly reduced then you most certainly have a ground loop happening.
you will then have to deside which way to go.
just something to consider.
Phil.