Magnat Phantom mono-block amp & xetec 5g-900

[japexi]

Hi,
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?

[Andrew F. Ali]

Re: Magnat Phantom mono-block amp & xetec 5g-900

Try shutting down the head unit first then switch off amp

[budm]

Re: Magnat Phantom mono-block amp & xetec 5g-900

Power up sequence:
Pre-amp on first, then turn on the power amp.
Power down sequence:
Power amp is turned off first then turn off the pre-amp.

Did this problem just start?