DIY amplifier making popping sound on speakers when switching OFF

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1200GXman

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Hi all
Assembled a DIY amplifier kit into a new cabinet that looks nicer that I bought and used many years ago. When switching on, it goes on, the relay activates and everything is fine.
There is no suppressor over the on/off switch. When I switch it off, there is a pop and then after 1 or 2 seconds you hear the relay opening. I read on the internet a bit about this and they say the relay must open before power drops to prevent popping. However this has a circuit board and I don't want to modify and fiddle too much with it.
Is there a simpler way to fix this?
 

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