Can a Naxos 3-6 purchased in the UK work in the USA?
I assume you mean a snaxo.
The snaxo needs something to power it, either a hicap or supercap, so there isn’t a UK or US variant, they are all the same.
So buy any snaxo, and then a 120v US variant psu.
Yes. Country of origin or voltage don’t matter with the NAXOs or SNAXOs
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Yes, no problem as the crossover does have an internal power supply. The crossover needs an external power supply set for your local voltage.
Yes
Oops,
The crossover does “not” have an internal power supply.
S
IXO has 
LOL! Where’s this much vaunted AI when you need it. 
Huh?
Sorry, bad humour. I read Olivesteve’s first post and realised he’d missed out a vital “not” in his first sentence. So I was joking about his correction.