Stuttery audio using USB DAC

Hi,

I’m using a raspberry Pi B+ with OSMC installed. The main function of the pi is a Plex client.

At the moment the Pi is connected to TV via HDMI then I have a toslink cable from the TV to a Cambridge Audio DACmagic 100. Works fine.

I tried today to go direct from the Pi to the DAC using USB. However, the audio was stuttery. This maybe a simple case of the Pi isnt fast enough (set to GPU acceleration) and I need a Pi 2 or something quicker. I was trying to improve on sound quality by skipping out TV. TV only seems to output 48kHz, I can set the frequency up to 192kHz direct from Pi.

Many thanks,
Matthew