I've recently purchased a Moto E XT1021 and am dismayed that it has the same audio hissing issue that some of the LG phones have suffered from. The exact problem is demonstrated on a YouTube video entitled "LG G2 KitKat Audio Issues (hissing noise)".
It appears that LG have acknowledged the problem but I wondered if anyone was aware of an existing or future fix that will work on the Moto E? I've tried the latest stock, CM11 and SlimKat ROMs but the hissing is present on all of them. This is very annoying when listening to soft music like piano pieces.
I don't want to purchase any more headphones because I already own several branded pairs that sound great on my other devices.
I've tried the suggested solutions of turning off DSP effects, using aeroplane mode, using PowerAmp etc. but these don't impact on the hissing.