Unfortunately, this deal has expired 6 June 2023.
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Posted 1 June 2023
Sony WF-1000XM4 Noise Cancelling True Wireless Earphones £159 @ Amazon
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Mr_Brassic
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Edited by Mr_Brassic, 6 June 2023
42 Comments
sorted byamazon.co.uk/dp/…ils
The sound quality from these is easily as good as the Sony pair and so far no battery issues
It is not a firmware but some design flaw. Happens with any sources on different devices.
Apparently it could be sorted by pushing down the black foam that is glued inside the canal. But it will restrict the membrane causing loss of sound quality.
I couldn't be bothered with this and returned mine to Amazon. Hope XM5 will have this resolved. (edited)
I will add that people were attributing the battery problem to the firmware version 1.4, but I do not think that is what the issue is. I believe the problem is that the ZeniPower Z55H battery that the WF-1000XM4 uses is not made for longevity. Maybe 500 to 600 charge cycles. Expect the battery to last for at least 1,300 hours before you start experiencing battery issues.
EDIT: I think Sony has limited the level the battery can be charged to with the firmware version 1.6 or 2.0 to increase the number of charge cycles for the batteries so that the batteries will last longer. The earphones will still show as being charged to 100%, but are really only charged to 85% or 90%. (edited)