High pitch buzz in speakers after adding some LEDs

We recently added some RGB COB LED strip 24V lighting to the HT. These are wall panels. When it changes colour from the DMX we are getting a high pitched buzz coming from some of the surround speakers just for a few secs when the colours are changing. I dont hear it but my AV installer does and some friends also hear it. This has never happened from any of the older LED lighting in the HT.

Is this a faulty power supply even though its brand new?

Thanks in advance...