HI
i have a strange thing happen with the X1800. On powering it on and powering it off I heard a relay click, that is until today.. today there was no relay click on power off, but i do get a pop/click in speakers on powering off instead.
Sorry, cannot help you with the rest of your question (I guess you’re asking is/was your mixer behaving normally) but for this part:
ALWAYS turn your speaker off FIRST
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The relays are indeed safety relays - only connecting your audio to the speakers after power on/off cycles have been completely safely.
if the relay fails, then there’s no click during power up and power off and the usual power on/off thump is audible through the speakers.
thankfully -relays are very cheap - but let a proper audio repair centre fix it
Might be related to the bad capacitors in some X1800 batches that then cause relay malfunctions. If you always had certain behavior and now suddenly that’s not happening, those caps may have finally gone bad. You might want to get your unit checked out before other stuff inside it starts getting damaged.
Posted by bassweight on YT in response to people complaining about ground post issues on the bottom of the X1800 circuit board:
Some people will get lucky with this fix for a short time like i did, but then i dug abit deeper in to this problem. The problem is a row of 25v 100uf capacitors next to the relays on the top board with all the inputs and outputs. the capacitors are rubycon pk series and maybe denon bought a big batch of bad capacitors. You will see two relays next to the xlr outputs and some more further down the board, change the 25v 100uf capacitors next to the relays, it will stop this issue my advice is use 105c low esr 25v 100uf caps, when i measured the original capacitors they had halfed in capacitance and were around 56uf this causes the relays to chatter or vibrate causing loss of output or distortion.
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