Boulder makes the bold claim that it builds everything it sells entirely in-house, indeed the company claims to be the last manufacturer in the USA to be doing so.

According to its website: “Along with assembly and testing, every circuit board and piece of metalwork is produced in-house at Boulder’s dedicated facility for unparalleled quality assurance”.

It’s perhaps because of this ‘do it in-house’ build philosophy that Boulder does not update models very often, not least because it needs to recoup its research, engineering and tooling costs for each model.
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https://www.whathifi.com/reviews/boulder-866-integrated