Lepai 2020a+ and FM Signal Interference

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Hello,

I made a speaker box from an ammo can using a Lepai 2020a+ and when I plug in a FM radio, the signal strength drops pretty significantly. Turning the amp off causes the signal to get stronger (the radio I'm using has a signal meter on it). I have replaced the capacitors per this thread:

Modding the Lepai T2020A+ - Techtalk Speaker Building, Audio, Video Discussion Forum

I have also replaced the inductors and it seemed to help a little, but not much. Is this an issue with my amp or class T amps in general? I ask because I have seen amps with built in FM tuners, so I assume there is a work around to this issue.
 
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