Question on replacing coupling caps in Hypex UCD400 OEM

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sumotan

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Joined 2013
Hi guys
Would like to seek your opinions on which caps are good replacement.
I tried replacing the 470uf caps with BG standard & guess what, no sound accept a tack tack tack sound. Thought that I had killed the modules. Thought about what happen & decided to reinstall the stock caps & it work again. So Im thinking if the esr of the BG might be the culprit. Question, is my thoughts correct & if so why do the Hypex require low esr coupling caps.
Would appreciate some tutorial on this pls

Thks
 
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