Hello, few days ago we received DX168-W’s, so I started to switch from old analog wires from mixer to amplifiers. All was good except for our stage amp, it’s a 6 channel amp. On all speakers after switching to DX168-W we had high-pitched noise. After connecting oscilloscope to the DX168-W output, I noticed that outputs of DX168-W are not clean, looks like switching noise from PSU is getting out (see attached picture, sorry, did not have a USB flash drive with me at that moment to make a good screenshot), the peaks are at around 70kHz, 50mV. Now, of course, my stage amp should ignore such a noise, but it doesn’t. Poor design! So what I did is – I added passive RC filter (Low Pass filter) and the high pitched noise is gone (see attached circuit). Hope this saves someone some time. 🙂
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