Hi . Using UPS for audio depends on audio equipment power supply type (50/60hz trafo or smps) and ups output waveform type ,when working on battery . Problem is when cheap upses produce modified sinewave ,which actually is useless for 50/60hz based transformers and can even damage some equipment , such upses can supply only simple smps based loads like cheap east made power supplies without active pfc ,but no way 50/60hz transformers ,or ac motors,or similar loads. They do produce square wave 50/60hz with pause , which will make transformer make buzz and probably heat ,also voltage on load will depend on load. Another story is with ups ,whose produce "pure sine wave" . You may supply most equipment from such ups , but when operating from battery,they produce some sound few khz ,maybe more , which is part of their pwm operation. This needs to be good filtered if using with audio loads ,because mostly pattial filtering is performed by ups output transformer itself .
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