Hi guys, apologies if this has been asked and answered before in the 400 pages of this thread but a bit of skimming and keyword searching drew a blank...
Just got a second hand Fiio E17 which I'm using connected to my galaxy S4 via USB OTG cable. Sound is much improved which is great. The issue is the S4 battery is draining at what is subjectively 1.5-2x the normal rate - and this is with USB charging turned off on the E17. Other settings: gain set to zero, vol at 18, tone settings all flat.
All I have as a benchmark comparative is my old Galaxy S3 with a Headroom total Bithead DAC via USB OTG, which from memory hardly affected battery drain - perhaps a 10% increase if that.
So this typical of most portable USB DACs or if not then a known quirk/issue with the E17 and/or phone specific?
USB power draw differs from device to device. Is really just about all I can tell you