Hi Mike, Yes, you could do that.
It’s easy to get the bits and make up a new DIN4 to 2x XLR cable though, as if you were to ever sell the 300, the supplied DIN4 to XLR cables should go with it.
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Update is that the same DR regulator had failed again, which was traced back to a short in the SNAIC. Just pretty bad luck apparently.
Should be here in a few days.
Can I check which inputs to use? Input 2 (CD) for ND555, Input 6 (Aux) for LP12 and input 5 (AV) to output to the headphone amp?
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So, is the DR regulator in the 552 PS? I wasn’t aware there are any DR regulators in the NAC552(?)
You do not want a short in your SNAIC… 
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It will be. As you say, there are no DR modules in the 552 head unit.
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Do i understand correctly - a bad cable (snaic with a short) caused all the trouble?
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Yes, that’s corrrct.
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Bu**er😥
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Sometimes it takes time to find what’s wrong, a cable that crosses is not the easiest, kudos to the good and persistent support of your previous Naim dealer and your own patience!
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When I read about Din’s and Burundi’s and Snacks… I’m SO happy my setup uses standard cables. XLR’s , USB, Ethernet. It seems as if Naim is stuck between the old and new.
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Respectfully , If you look into it you will find Naim cables are very reliable and very very effective for music replay in Naim systems. Very simple and not even close to confusing.
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But a snaic is a standard cable - and in very rare cases it could also happen to a cable, even a naim one.
Naim cables are really reliable as already mentioned
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You bought a quiet 552
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Do you know, was it a short in the cable or the DIN terminations (?), as one of the risks with DINs is that a stray fine strand/even a strand of solder can bridge the cable/pin terminations.
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It was a short in the cable, a few cms from the DIN plug. It’s rare, but happens unfortunately.
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And…… we have 
Gosh, I’d forgotten just how good the 552 is. The window is right open.
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Wonderful ! It was quick finally. You will enjoy still more now, after all this bothering.
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Great News
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Great news👍
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That’s excellent. Let’s hope it remains trouble free.
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