I have Magnat Phantom mono-amp.
When remote power goes to zero, sound from speaker starts to fade away and then it makes very loud "pop" - noise. Like some kind of voltage spike to speaker. So I need to know what components I need to replace..
Any help?

Schematics attached.
And I also have Xetec Gravity 5G-900 amplifier. Does anybody have schematics or repair manual for this?...
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