Sound Blaster E1 Portable DAC/Amp Review: “A Great Cheap Audio Device!” | by Alex Rowe | Medium
Creative Sound Blaster E1 Portable Headphone Amplifier with Integrated Mic and Dual Headphone Jacks for PC and Smartphones - Reviews | Headphone Reviews and Discussion - Head-Fi.org
Creative Sound Blaster E1 review - Headfonics.com
Creative E1 ultra portable headphone amp with USB DAC