My Markbass Little Marcus head won't stop humming

"Humming" and "buzzing" are often used to describe different sorts of noise. Is it really humming (a deep "MMMM") or is it buzzing (sharp "ZZZZZ")?

I'm not familiar with either the amp or the interface, but this is kind of a generic problem, and there are some generic causes and solutions.

Some things in the "hum" category:

Are you using a balanced cable (XLR connectors) between the amp and the interface? If not, and if the amp and interface both have those connectors, try a balanced cable.

If you're using a balanced cable, does the amp have a "ground lift" switch? If so, try changing it, does it affect the noise?

All the equipment - amp, interface, and computer - should be plugged into the same circuit. Try using an outlet strip that you can plug them all into.

Some things in the "buzz" category:

Is the amp close to the interface and/or the computer? Try separating them. The amp could pick up and amplify electronic noise from the computer or interface; or the amp could be generating noise (especially if it has a switching power supply) that the interface picks up.

Light dimmers and LED light bulbs can generate electronic noise that affects pickups and amps. If you have dimmers, shut off those lights. If you have LED lights, turn them off or move a lamp to a different circuit.

 

Maybe it doesn't know the words??






I'll see myself out now......

 

I use a LM250 through a Scarlett 2i4 with no issues during these so-called pandemic times.

 

So called?