I have connected my BeoLab 3's to Masterlink via a Beolink Active Box and I have 2 problems:
Problem 1: I experience a lot of humming. As soon as they are turned on they make a plop sound when the relays turn them on and then they start humming. I don't hear this when the music is playing, but between tracks and at low volume passages it's very noticeable.
I previously used them as rear speakers connected to my Avant, and didn't notice any humming.
To try and find the error I have:
1. Switched Active boxes, (I have 2), they both hum, one "loudly", the other a little less.
2. I have disconnected a speaker and taken it to my kitchen and used the cables for the BL3500 that's hanging out there. It still hums. I noticed that the 3500 also hums, but not nearly as loud and this isn't noticeable as it's hanging on the wall and is further away from the ear.
3. Connected a BL6000 in place of my BL3. This also hums, but not as heavily.
4. Checked my junction box, but I can't see any problems with it.
I am using the MK.III cables, so they should be fine.
Problem 2: One of the Active boxes makes the sound very "boomy". I don't know if that makes any sense, but I don't know how else to explain it. The other box sounds fine, and does not do this, at least not nearly as much. It doesn't help if I turn down the bass settings.
Do any of you have any suggestions?? Is this normal for ALT speakers connected to Active boxes?? or am I just sitting to near to the speakers?? I am going mad about it [:'(]
The setup can be seen here: http://forum.beoworld.org/media/p/251747.aspx