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Thread monitor hum

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1 monitor hum
Hi from a newb :)

I've got a pair of Quested F5's hooked up o my laptop for monitoring/general listening. They are humming a little when connected but do not when I remove the cable.

I think the problem is due to my cabling, which goes thus:

mini jack from laptop - y splitter with female 1/4 plugs - 1/4 plugs to XLR connection on monitor. Is it a ground loop problem due to the balanced/unbalanced nature of this cabling.
if so can someone give me a little advice on the best way to sort this out.

The hum is very small but once you know its there it drives you mad, especially at low volumes.
2
How is the 1/4" to XLR wired? I use the Neutric adaptors and have never had a problem. If you use the Radio Shack transformer type you "may" need to cut the internal frame ground loose and tape it.