Originally Posted by Travelbug
I mentioned custom kernels because on the sgs3 at least, there are kernels that greatly improve sound quality. The siyah kernel I use for example would sound an 8 (in a subjective sq scale of 10),while the stock kernel would rate a 6.
I'm wondering if the Leck would give me much of an improvement since my vsonic gr07 iems are easy to drive and when I connected a just audio uha 120 to my setup there was only minor improvement to sq.
Compared to stock there is a distinct difference. Mainly with the Shure SE535LTD-J IEM's. Without gain boost the background is pretty black with the Leckerton where as the phone has an annoying buzz or hum. Overall sound quality is improved with a broader sound stage an superior instrument separation. The are details in the music I was unable to pick out before such as audience members saying I love you to the artist etc...
As you are bit streaming out of the USB, I highly doubt sound quality would be altered with firmware on the phone. The DAC and Amp are in the Leckerton.