"I just wondered if you had to recommend a set up to someone (who wanted a nice stereo), would you consider cabling to be essential in your build price and your recommendations? If so, would you consider the cost of the cables to be on par with the cost of a component?"
I think cables can be very, very important.
Many would agree with that.
However I would suggest putting the investment into the speakers and electronics and using decent budget cables.
That will likely be more impactful than using handfuls of $500-1000 ICs on lesser grade speakers and electronics.
I suppose it we are talking high 5 or 6 figure budgets then the cables are in the budgetary noise.
I'd tell them to get the best gear they can to start, use the stock cables and then slowly upgrade the cables when they're able to. So, they should absolutely assume new cables are in their future, and therefore, start saving. Because they can truly, significantly enhance the experience when they upgrade--and it's a fun way to learn the hobby.
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