Speaker Noise when volume turned down LTN226W Samsung

Has this just started , have you added more speakers, do you have more than 1 speaker per channel? Impedance is very important and you should never have less than 4 ohms per channel, 8 is preferred..try and disconnect on channel speaker and see if it still happens. If it does reconnect speaker and remove the remaining speaker and try it. You may have a bad speaker, it sounds like you have an overload and unit is going into protection.
here is a link to manual


https://manuals.marantz.com/pm5005/NA/EN/index.php

Sony STR-K840P Sound center speaker - Questions - Fixya

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... sound from center channel during viewing, or during speaker level test- all other speakers emit tone, but center is dead. I have optical digital cable and hdmi ...

Sony STR-K840P Sound center channel - Questions - Fixya

www.fixya.com > ... > Sony > Sony STR-K840P

... sound from center channel during viewing, or during speaker level test- all other speakers emit tone, but center is dead. I have optical digital cable and hdmi ...

Sony STR-DB940 pulled back from the brink - Page 2 - Badcaps ...

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yup you got a bad one return it it is not the speaker it is audio decoder ic

Check out the left channel amp stages - your issue is there.

This is common with the type of powered speakers where the IC package that drives the speakers (the amp) is getting to hot and shuts down. Usually it is damaged and not reversable. There is a lot of reports of this same model loosing one channel or playing quietly. The air most likely cooled the chip down until it heats back up.

DFCVXB

HIT MENU, GO TO AUDIO (SPEAKER PIC) SCROLL DOWN TO "2ND PAGE" AND SELECT SPEAKERS ON. AND YOU MAY NEED TO ALSO SELECT SBS ON

You've probably tried this, but when you do the channel test you can turn the volume up or down on whichever speaker is currently being tested (the static). Maybe your speakers have been adjusted somehow.

First,
Disconnect any input cables from the amp. Turn down the volume controls and disconnect the speakers. Power back on. If you still blow fuses with nothing hooked up, have the amp fixed.
If the fuse holds, shut down and connect the speakers, leaving the volume controls down. Power up and see if your fuse holds. If you have hum, an output transistor is most likely shorted. If you have no noise, SLOWLY turn up the volume controls and listen for the hum. If all is quiet, turn down the volume controls and connect your input cables and turn the volume back up. Noise? check your cables!
Mister Phil

Found a solution that works. Power down the receiver. Unplug it from the wall. Wait 10 minutes. Plug it back in and power it back up. Worked like a champ to fix this exact problem with my TX-SR601.