Glitches and crackle with Hi res Files

Connection with external Audio Devices USB DAC
1

Hi, I am using Audirvana (latest version) on a Mac Mini 1,4GHz i5 with 4Gb Ram (OSX 10.11.2). Musi Files on an external USB2 Hard disk.
I have set the Upsampling to DAC max resolution (24/192) and the interface is XMOS USB Audio 2.0; but very often I experiment glitches and crackles.
Is my Mac too low specs or what are the setting that can avoid the problem?
Thanks for your help
Massimo

2

Try setting the maximum memory allocated for tracks pre-load no more than 512/1024

3

Disable upsampling. Consider upgrading the RAM if you want to upsample.

4

Thanks everybody. Unfortunately I can’t upgrade the RAM in my MiniMac model and I’d like to use the upsampling, because it sounds great with my DAC (Line Magnetic with valve analog section). I compared the Audirvana algorithm to Volumio and Audirvana sounds a bit better , especially with DSD files.
I tried to reduce the memory allocated to pre-load and it seems to work. I keep my fingers crossed even if I am prepared to get a more powerful computer.
Ciao
Massimo