It looks very ‘space age’ next to the NAP 100!
It’s had a bit of a warm up, so some Zep going on next, just to see if the Dynaudios can do their thing.
(I know the beauties will) 
Help! None of the three cables i own will connect Atom HE to NAP250DR???
3 pin x2 from Atom to single 3 pin of 250 does not seem to exist for some bizarre reason?
This feels like trying to build a PC in the 80’s … 
You need one made up, various companies do this. Must be unbalanced RCA to 3 pin XLR wired for Naim.
Search function will help you.
Bruce
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Yeah, some giant PSU fan adapter cables 
Love the HE, very versatile piece of kit. Add an upgrade power cable when you can, if you haven’t already. Really benefits from that!
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The Atom HE uses XLRs for its balanced output. The single input on the 250 is unbalanced and has a different pin layout. You need a 2 x RCA to XLR cable.
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I would second the addition of a power/mains cable. In my case the addition of a Power-line to the HE provided immediate SQ improvements.
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I got a cheap mains conditioner but don’t want to end up buying other bits, its already cost me an arm and a leg 