Self-explanatory title. Yes, I am using 2.4GHz Wi-Fi but it works just fine on Windows so I don’t think that’s the issue here. My network card is an Intel AX211. My headphones use the aptX HD codec.
AptX HD has better quality but also needs a better connection, try SBC and check if the situation improves (or check what Windows uses).
SBC and other lower codecs don’t have crackling but it doesn’t sound as great as aptX HD does. I suspect Windows is using aptX Adaptive, but am not sure where to check codecs on Windows. Is there any way i can get Linux to use aptX Adaptive?
Doesn’t look promising at the moment:
Otherwise not much one can do. Avoid traffic at 2.4 GHz. Depending on the setup a Bluetooth dongle could maybe improve the situation, so that at least not all traffic goes through the same antenna.
I moved everything except very low-traffic IoT devices from 2.4 GHz and be able to run through the whole flat with SBC or AAC. The only thing that crackles the signal is standing next to the microwave. aptX and esp. aptx HD: starts acting up while still in the same room. 
Damn. I know for sure it’s cause of the Wi-Fi cause when I’m on LAN this doesn’t happen at all. Crispy clean audio with Wi-Fi disabled, but it’s a crackly mess whenn enabled. I’m pretty sure the Wi-Fi networks I use have 5 GHz. Is there a way to toggle between 2.4GHz and 5GHz bands on demand or (even better) automatically do so when Bluetooth is turned on and off?
Fixed it. Turned out to be the TLP PCIe ASPM settings. I set everything to default and it worked perfectly.
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