buzzing speaker!

[Noah Nelson]

Have nice monitors (works fine), got a second pair, both are hooked up through my MBOX mini using a splitter chord...
With 20ft cables they are buzzing (high pitch frequency)
with 5ft cables they are buzzing but not quite as loud
with a 2.5ft cable they are not buzzing.
...are my cables F***d up, the MBOX F***d up, the splitter F***d up, or the length of the chords F***d up? any ideas on what it can be?

 

[Seidy]

Are you using balaced or unbalanced cables?
Also try to connect the monitors without the splitter.

 

[Steenamaroo]

Is this splitter allowing you to have two pairs of active monitors running from one pair of outputs?

That's not great practice and probably explains the problems you're having.
If you want four speakers simultaneously either get some kind of mixer or line-level distribution unit or something.

It's not really a great idea anyway, to be honest.