Hi,
I've recently bought a pair of 1More Quad Drives for use with my Galaxy S10+. They're a great sounding pair of earphones but I wanted more volume. I've received today a Dragonfly Black amp/DAC along with a USB-C OTG cable to connect the device to my phone, which I had thought would do the trick, yet when operating the earphones through the Dragonfly on my S10+ the volume remains the same as ever before... there's no increase in volume whatsoever between using the Dragonfly and simply having the earphones plugged directly into the phone's 3.5mm jack. I've tried it on my gf's Galaxy S9 with the same results.
Was I wrong to expect a volume increase from the Dragonfly device?