Low Hum (Yes I used the search function, please read).

I have my MPC1000 Connected to my M Audio Mobile Pre USB Interface.
The Cables I use are Monter Prolink 12 ft. cables, with the 24k gold plated tip or whatever.

I have isolated it down to this:

The hum only occurs when the AC cable is connected to the mpc. Even when the MPC is powered off. When I remove the AC Cable (power cord) The hum immediately stops, and vice versa.

I can not afford any power conditioners and the Hum-X thing i was reading about. I have been saving for a long time, and getting donations to have the aforementioned equipment and cables.

(Also, when I connected the Cables from my MPC into my Eurorack UB2222Pro-FX mixer, the hum was even more audible.

Can someone please help, if possible?

I used the search function and tried everything that was even related, to no avail.

No cables and AC cords are running parallel, I even made sure that my cables aren't even touching any other electronics that they are not connected to. I tried plugging the MPC into a surge protector, and straight into the wall, no luck.

Please help. Thanks.

-Sanova

Sounds to me like a grounding issue. Try lifting the AC ground by either plugging the MPC into a 3 prong to 2 prong AC adapter, or you could simply break off the grounding prong from your MPC cord. I would recommend the adapter though.

Sounds like the classic ground loop. Read this:

http://www.epanorama.net/documents/grou ... index.html


A number of people on here have already reported this type of problem when using m-audio interfaces. Probably because of cheap design and lack of proper isolation.

It's a good idea to plug all of your gear into the same power strip (and if you need more than one, plug the first one into the second). That may not solve the problem though.

The quickest and safest solution is to use some type of direct box or isolation transformer to connect anything to the M-Audio. However, if you have to use more than one transformer to make all the connections you can potentially introduce new loops where none were present.

Other solutions start to get tricky because of safety issues, especially if you don't understand the electrical nature of the boxes you are trying to connect. One "quicky" suggestion I've given on here before is to try a 3 to 2 prong AC adapter to remove the ground lug connection on ONE of the units (in your case, either the computer or MPC). You can often get away with this in small setups, BUT the ground lugs are a safety feature and if any stray current gets into such a system (and that possibility becomes much greater if you start connecting more stuff) you could end up giving yourself a shock.

There's also the star ground system used in larger studios, where everything that's SUPPOSED to be grounded has a bit of paint scraped off (for proper conduction) around a chassis screw to which ground cables are attached. The ground cables are then attached to a single ground strip that runs around the studio. You still have to be very careful doing this as some gear is "double insulated" and not meant to be grounded in this fashion, and doing so may create more noise and shock hazards.

I think your best bet is isolation or to replace the M-Audio. Both M-Audio and Berringer have terrible records in terms of ground loop resistance.