MR 816csx (imac) to analog mixer

[Cactusslim]

I see several topics on here but have not found my exact problem I don't think. I'm sure it's somewhere here.
If I hook up my self powered monitors to the outputs of the MR816 it is clean. If I want to run the signal to a recently purchased analog board I get digital noise. Mostly high register stuff. It doesn't seem like it could be a grounding thing as it does not sound like a typical ground loop hum. Any ideas?

[walter1956]

connect ist with a DI-Box between ground lift off ... maybe it will help. I had such problems when connecting a Mixer.

walter

[theextravaganttraveller]

Is it white noise you're experiencing? I just went through two units that just wouldn't stay silent when plugged directly into my Genelecs (in standalone mode or when hooked up via FW)... Couldn't find any reason/solution. Seems that the MRs just don't play well with certain gear.

Curious to hear if a DI fixes it for you. Good luck!

[Cactusslim]

I believe I had 2 issues going at once here. I had a lot of hum which sounded like a ground problem between my Imac, Soundcraft 800b mixer and self powered Spendor speakers. I put DI's between my mixer and the speakers and it has helped tremendously. I have also gain staged a little differently and the "white noise" is almost bearable now but I'd love to get rid of it.

Extravagant traveller, I do not have this white noise when I plug my self powered speakers directly into the MR816, only when I run the MR816 into an analog mixer and then to the speakers. I have hooked it up twice this way and found the same noise both times.

anyone have the solution for killing this noise? I'd rather not have DI's coming from the interface to the mixer and di's between mixer and speakers.

[theextravaganttraveller]

Interesting - I had the noise issue even when connecting the MR directly to my speakers. I tried just about everything with 2 different units, and the noise was always there. Switching clock would temporarily kill the noise, but would always come back when new clock setting was synced.

The strange thing is that both my old audio interface and my new Saffire 40 plugged into the SAME receptacle do not produce any noise.... The power in my space IS a little iffy, perhaps it's possible that a combination of poor power and the MR design could result in this type of noise coming out of the outputs?..

Good luck trying to sort this out, and update if any success!

[ciptension]

Cactuss, the ground loop problems and the grounding problems can generate noises of any frequencies. Hum is one.

With a little imagination, you can use one ground problem to ... play music

I have some experience chasing ground loops (my setup involves PC, TV-tuner, TV, MR816, different external effects, another mixer, powered speakers, another computer, Ethernet LAN, Radio Transceiver… enough? ) and your (and others people here on forum crying about their noises) problem sounds like grounding for me.

The fact that the DI fixed part of the problem confirm my theory.

Now, I must tell you that, after 3 weeks of fighting with my ground problems, I managed to run the above setup without ANY DI (I hate DI’s in my audio path since they eat highs, no matter how expensive DI is). Also using DI's is only addressing the effect, not the cause and you may fry some of your equipment by using this solution.

You can do the same, but you need some basic physics knowledge (in my country I’ve studied this when I was 11, lucky me I still remember ).
If you are not comfortable with an Ohmmeter, I think I can assist you to get rid of the noise and the DI’s in your setup, but you have to be patient.
Is this forum allowing subscribers to attach pictures?