Loud pop from Left Channel when power-on/reboot
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=8254
Printed Date: 19 Jul 2025 at 10:56am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Loud pop from Left Channel when power-on/reboot
Posted By: cristy6100
Subject: Loud pop from Left Channel when power-on/reboot
Date Posted: 01 Apr 2018 at 7:16pm
|
" rel="nofollow - Well I first thought I was my XLR cable that was causing the pop when rebooting, but after swapping the Left/Right cables between them the pop moved to the right speaker, the problem is that on a high power amplifier like a Behringer EP4000 that outputs almost 1000W RMS per speaker at full power it damages the speakers, the pop is a low frequency 10-25 Hz but coming from the sound-card at full power it gets amplified at almost 1000W RMS, it not doing good for my speakers even if the can handle it. It scares me every time. I can't power off the amplifier either every time I power on or reboot the system cause its in another room.
Could you guys with AB350 ITX/X370 ITX confirm if you also get a loud pop on the left channel when reboot/power-on? I removed the cables, restored bios defaults, this also happend with Bristol Ridge CPU's, it might be a firmware related issue or a more critical hardware design fault. I hope not for the latter... but it seems the channel is not muted when the capacitors charge, this does not happen for the right channel... Lowering the amplifier volume is not an option, I can't increase and decrease it every time I need more power, this will wear out the pots in no time, these amplifiers are made to run full power and the volume be controlled upstream I just need someone with some good speakers that could test this, if possible increase the volume gradually and confirm But the pop beign only on the left channel tells me it might be a firmware confguration bug, when they set the mute/cut-out from the ALC1220 chip until the capacitors charge, they forgot to set it for the left channel also. EDIT1: I sent a support ticket to ASRock describing this problem, I just wanted to see if others have it on the Fatality X370 ITX/ac or AB350 ITX/ac Thanks
------------- Main Rig: AMD Ryzen 2400G | ASRock Fatality X370 ITX/ac UEFI 4.90 | Corsair LPX DDR4 2400@3200 1.35V | Corsair RM650i PSU | CM ML120L AiO Cooler |
Replies:
Posted By: kerberos_20
Date Posted: 01 Apr 2018 at 8:30pm
|
Try a decent quality home theater or electronics power strip/surge
protector. This doesn't necessarily have to be expensive, but do read
for reviews and make sure it actually does something and isn't just a
heavy hunk of metal snakeoil. Try both putting all the equipment on the same power bank, then try on different isolated power banks, and maybe it will solve the issue. For example triplite isobar powerstrips have isolated power banks. If that doesn't solve your problem, i'd next try a UPS or switch from analog to s/pdif / optical. that being said, unless your equipment sucks, I don't think you are specifically damaging it even if it does get pops. but your receiver is at fault here edit: dont know if my speakers qualify as decent but i use yamaha htr 4069 with this 5.0 speakers:  Skytronic 5.0 Home Teather Power max.: 3x 50W + 2x 180W, equivalent to 1150W Power rms: 335W Woofers: 10/16 cm and this subwofer:  auna linie-300-sw Power max.: 300W Power rms: 150W Woofer: 25 cm no issues here but with old logitech x530 i was having loud pop when either pc startup or shutdown, obviously it was at fault logitech amplifier, they replaced it later with fixed version year later (z-506 i think) ------------- http://valid.x86.fr/diq4l4" rel="nofollow">  http://www.userbenchmark.com/UserRun/47132492" rel="nofollow - userbenchmark |
Posted By: cristy6100
Date Posted: 01 Apr 2018 at 9:13pm
|
Thanks for checking, well I can say for sure its not my equipment or power delivery, I use a Behringer EP4000 modded with all Nippon-Chemi-Con and Panasonic capacitors, and Magnat Monitor Supreme 2002. If I just unplug the jack from the rear and plug it in the headphones jack, reboot, no pop with nothing else changed. If it was an equipment fail the pop should not move from the left to the right speakers when reversing the cable that comes from the motherboard, the strange thing is that its on the left channel and only on the line out, the headphones jack works with no problems. Nice sub and speakers setup, maybe the Gaming X ATX model dosent suffer from this issue, I will test now the other jack and report back ------------- Main Rig: AMD Ryzen 2400G | ASRock Fatality X370 ITX/ac UEFI 4.90 | Corsair LPX DDR4 2400@3200 1.35V | Corsair RM650i PSU | CM ML120L AiO Cooler |
Posted By: cristy6100
Date Posted: 01 Apr 2018 at 9:42pm
|
" rel="nofollow - Well it seems the only affected jack is the front speakers one, the green one and only the left channel, plugging the jack in the black or orange one (rear speakers center/sub) no pop or nose is occuring upon reboot, the front panel headphones one is the same, no noise or pop on it when rebooting or powering on the system, so it seems to be a hardware fault on the motherboard sound card or maybe a firmware bug that is causing this pop to occur upon power on/reboot but it seems strange that it occurs only on the front speakers green jack.. Any thoughts? Should I send the board in warranty? I need to mention this pop is occurring only when the amplification is equivalent to about 1000-1200W RMS, so I am expecting 99% of people wont encounter it due to not having powerful enough amplifier to boost the signal to these levels where the pop is audible. Messuring the line-out with an osciloscope would reveal the current inrush on the left channel Small update, changed every bios settings relevant to audio to no avail, changed cable and messured the voltages going in the amplifier on the left channel, there seems to be a voltage spike of about 0.7-1.4V for about 1 sec. on the left channel when powering up/restarting the PC. This voltage is generated by the motherboard's soundcard circuitry as I mentioned only on the left channel and only on the line out jack, all other jack behave normally, if lowering the input to about -14dB from the amplifier the pop is not audiable, but the same voltage still enters the amplifier input stage and OP-AMP's
------------- Main Rig: AMD Ryzen 2400G | ASRock Fatality X370 ITX/ac UEFI 4.90 | Corsair LPX DDR4 2400@3200 1.35V | Corsair RM650i PSU | CM ML120L AiO Cooler |