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.

https://preview.redd.it/d1akr6rrm11c1.jpg?width=2000&format=pjpg&auto=webp&s=29d5691a5386c9fb4b17023f205f67f65207f55b

https://preview.redd.it/oxdp27ssm11c1.jpg?width=1500&format=pjpg&auto=webp&s=b1a60aa785f016c1d84571fc64ef1831d1326e47

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…