Monitor Hum.

[NLAlston]

My father-in-law passed away, a couple of months ago, and I inherited his KRK Rokit8's - which were (by the way) brand spanking new. The acquisition of these left me with two sets of monitors; the KRK's, and the Behringer B2031A's. As I liked the output of the KRK's better (there was also some sentimentality there), I recently sold the Behringers. Now, I had only set the KRK's up just once, before I decided on selling the Behringer's, and keeping these. The problem is that I am now hearing a light humming sound emanating from these monitors. This is something that never occurred with my behringers, and I hope that I didn't make the wrong move.

Would anyone know what this issue could, possibly, be attributed to? These monitors are hooked up the very same way that my Behringers were. Nothing different has been done.

Advanced thanks.

 

[dementedchord]

swap the outputs at the interface ... if the noise is now inthe other mon then it's an interface problem... check the jacks.... if the noise remains in the one... then swap the cables... if it changes speakers then it's the cables... still with the one???? unhook totally... noise still there??? then it's mostlikely a power supply problem with that speaker... check it and get back to us...

 

[NLAlston]

swap the outputs at the interface ... if the noise is now inthe other mon then it's an interface problem... check the jacks.... if the noise remains in the one... then swap the cables... if it changes speakers then it's the cables... still with the one???? unhook totally... noise still there??? then it's mostlikely a power supply problem with that speaker... check it and get back to us...

Hi, DC ~ and thanks for responding. What's going on, here, is equally affecting both of my KRK monitors, and the cables that I am using are relatively new Mogami's. I do, however, have a twin set of these cables, and will give them a shot. I really don't think that the cables are the problem, though, because they worked just fine with the Behringers - which I just sold on this past Tuesday.

 

[petermiller]

depending on what the hum actually sounds like? if its 60 cycle it would lend itself to some ground issue and first step would be to consolidate all the power plugs into one power strip for all the gear that would be hooked up with this and have that eminate from one circuit. it may also be caused by emi or rf eminating from either a computer or proximity to a electrical service coming into y.our building. the behringers may have had better sheilding to this as it is something that they had worked on after the first few runs of those monitors, but as always eliminate aspects from scource to speaker as the others had stated first to see where the problem enters the system. also check that your run is balanced if possible. also that your gain structure from output and input attenuaters is correct to avoid raising the noisefloor and that any eq setting switches and tweeter attenuation switches on monitors are set propperly if there are any. lastly make sure the outlet you are plugged into has no dimmable lighting on its circuit. thats all I can think of without hearing it!!!!

 

[TyphoidHippo]

Hey there, I didn't really read all these posts, so if somebody already mentioned this, then sorry -

just wanted to say that aside from ground-loops and such - one thing you can try is checking if there's any place you can use a balanced cable (XLR or TRS, either way), but you are currently using unbalanced - If so, switch to a balanced one and see if that helps (noise-elimination is kinda what they're made for...but it may or may not actually help you here). You may know this already, and you may use entirely balanced connections everywhere possible - but I figured it might help to mention it.

If you can't figure it out, and want to get rid of them - I may know somebody who'd buy them from you...just holler at me if that's the case, and I'll ask him.

 

[DAS19]

theres an art to fixing ground loops. it sucks that it takes forever to learn that art. its a very annoying process fixing a hum problem.

 

[NLAlston]

Thanks everyone. I will apply all of this information towards an effort at defeating the problem, and will come back with an update just as soon as I get a chance to work at it (will be rather busy for a little bit).