Recently, I’ve started seeing more products have the option to show an FFT visualiser on their display while audio is playing, namely the RME ADI-2 and the Topping A70 Pro/ D70 Pro. I have also seen standalone rack-mount units with the same functionality, such as the BDS PP-31.
Do desktop-size standalone units exist to add this visualisation to an existing setup? My search so far has only turned up expensive lab-grade equipment…