Hi guys ! I've been asking myself this for a while. Most boutique preamps have Di inputs but I'd like to know if it would sound better to use an external Di plugged in the mic input of the same Di. I mostly use my ISA Di for bass and sometime to for guitar direct sound (as a backup). I found the ISA to sound good, but I just not want to be missing having a better sound for a couple of hundred box... Should I invest in a good external Di like Radial's if so which one would you recommand ?