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<blockquote data-quote="John Roberts" data-source="post: 101283" data-attributes="member: 126">Re: Behringer iNUKE NU6000 amplifierJapan has both 50Hz and 60Hz mains power regions but that should be of no consequence to a switching supply while 50Hz (where I think the customer is located) will have deeper ripple sag on primary capacitors. The customer seems pretty confident in his mains voltage quality. If he has marginal power it seems a lower technology, lower efficiency amp could have even more difficulty. :-(Without on-site measurements and testing there may be no way to determine what exactly is going on. It could be something else wrong with associated wiring or speakers loads. This too will reveal itself over time. Hopefully David will keep us informed about his experience with whatever he replaces the NU amp with. I understand all about customers, especially the customers you attract with value pricing. The work is delivering products that function despite them, but sometimes it isn&#039;t the customer&#039;s fault. A refund is the best you can do from a distance (the customer is always right), hopefully we&#039;ll get the rest of this story at some point. JRPS: +/- 10%&nbsp; +/- 10V does not seem like much high-line/low-line mains voltage range. Perhaps adequate for a highly developed country like Japan, many parts of the world would not tolerate a 10% low line, while your higher voltage models seem to provide a little more generous low-line input range.</blockquote>

[QUOTE="John Roberts, post: 101283, member: 126"] Re: Behringer iNUKE NU6000 amplifier Japan has both 50Hz and 60Hz mains power regions but that should be of no consequence to a switching supply while 50Hz (where I think the customer is located) will have deeper ripple sag on primary capacitors. The customer seems pretty confident in his mains voltage quality. If he has marginal power it seems a lower technology, lower efficiency amp could have even more difficulty. :-( Without on-site measurements and testing there may be no way to determine what exactly is going on. It could be something else wrong with associated wiring or speakers loads. This too will reveal itself over time. Hopefully David will keep us informed about his experience with whatever he replaces the NU amp with. I understand all about customers, especially the customers you attract with value pricing. The work is delivering products that function despite them, but sometimes it isn't the customer's fault. A refund is the best you can do from a distance (the customer is always right), hopefully we'll get the rest of this story at some point. JR PS: +/- 10% +/- 10V does not seem like much high-line/low-line mains voltage range. Perhaps adequate for a highly developed country like Japan, many parts of the world would not tolerate a 10% low line, while your higher voltage models seem to provide a little more generous low-line input range. [/QUOTE]

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