if the router is on the same circuit as the amp another thing to try is wrapping the tiny wall wart power cable for the router through a ferrite 6 or more times. Many wall wart switchers radiate enough noise back into the ac line, not as buzz or hum, but a damper on high end and soundstage width.
Hey if you ever want to waste some money, you could just buy one of those Faraday cages being sold to block your own WiFi (it's as stupid as it sounds).
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