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Ax1200i Buzzing on Pure Sine Wave


Demandred
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Hi Guys

 

I hope somebody can help me, I recently connected my Rig to an APC SURT10000lxi UPS which is a 10KVA double online conversion pure sine wave UPS.

 

http://www.apc.com/shop/id/en/products/APC-Smart-UPS-RT-10000VA-230V/P-SURT10000XLI

 

Since then the PSU emits a really annoying buzz, I have connected the UPS to an oscilloscope and can confirm that the output is indeed pure sine wave.

 

All of my sound equipment is also completely silent with no buzzing on the same UPS.

 

I have tried isolating each component on the output of the UPS and no change.

 

Does anyone have any ideas on stopping this buzz? It cuts through any sound...

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