Popping and Crackling Sounds when notifications come

Dear all,
I am facing an annoying problem I think since I have update my laptop to Windows 10 version 2004.
I have the sound off, most of the time, and theres an crackling sound when a notification comes, (eg. email notification).
This only happens when my laptop is connected to external power.
Does anyone face a problem like this and have a solution?
Thanks,
Jorge

Hello @Paul Black,
Thank you very much for your help.
I think it is easier to post my hardware specs from HP site:
Hardware

Product number	P7T50EA
Product name	HP ENVY Notebook - 15-ae105np (ENERGY STAR)
Microprocessor	Intel® Core™ i7-6500U with Intel® HD Graphics 520 (2.5 GHz, up to 3.1 GHz, 4 MB cache, 2 cores)
Memory, standard	16 GB DDR3L SDRAM (2 x 8 GB)
Video Graphics	NVIDIA GeForce GTX 950M (4 GB DDR3L dedicated)
Hard Drive	1 TB 5400 rpm SATA 256 GB M.2 SSD
Optical drive	SuperMulti DVD burner
Display	39.6 cm (15.6") diagonal FHD IPS anti-glare WLED-backlit (1920 x 1080)
Keyboard	Full-size island-style backlit with numeric keypad
Pointing device	HP Imagepad with multi-touch gesture support
Wireless Connectivity	802.11b/g/n (1x1) and Bluetooth® 4.0 combo (Miracast compatible)
Network interface	Integrated 10/100/1000 Gigabit Ethernet LAN
Expansion slots	1 multi-format SD media card reader
External Ports	1 HDMI; 1 headphone/microphone combo; 4 USB 3.0 (1 HP USB Boost); 1 RJ-45
Minimum dimensions (W x D x H)	38.4 x 25.5 x 2.29 cm
Weight	2.36 kg
Power supply type	90 W AC power adapter
Battery type	3-cell, 55.5 Wh Li-ion prismatic
Webcam	HP TrueVision HD Webcam (front-facing) with integrated dual array digital microphone
Audio features	Bang & Olufsen with 4 speakers and 1 subwoofer

I am running Windows 10 Home edition, Version 20H2 compilation 19042.630

- - - Updated - - -

I am dealing with it since it upgraded to windows 10 2004.
Since then its a nightmare.
I have tried several versions of Hp Realtek drivers and all the other drivers, followes all the tips I have found in the web and the noises are still here.
It happens the most when the laptop is runnig on external energy, on startup, when a notification pops, sliding the volume up and down.
Most of the time I have the speakers muted but the noises pop up I think from the subwoofer.

Paul Black said:

Hello @Jorge Martins,

I assume that you have checked that all the leads etc are seated firmly?

Yes Paul, I have opened the notebook and checked all this, the only thing that was not ok was one of the cables of the Wifi card.

The only thing it finded was the wi-fi card that I have disabled thies morning:

Problem Devices . . . ======== ============== ==================================================================================================== ================== Device PNP Device ID Error Code ======== ============== ==================================================================================================== ================== Broadcom BCM43142 802.11 bgn Wi-Fi M.2 Adapter PCI\VEN_14E4&DEV_4365&SUBSYS_804A103C&REV_01\4&2722D2B9&0&00E5 This device is disabled.