Hi guys Two weeks ago I brought new Schiit Lyr and Bifrost combo. I use my MacBook Pro as music source. I have a Bose Music Monitor speaker, plus a Etymotic ER-4PT Portable In-Ear Earphones. Most of my music are in the format of mp3. Unfortunately, I couldn't tell any difference between using Schiit products or without using them. I am wondering is it normal? Is it because my earplug or speaker is not good? It's my first time to use DAC and Amps. Before with my headphone experience, when I update my headphone to some good ones, I can immediately tell the difference. For example, if I use HD650 or HD800, I can immediately feel improve of sound quality. But for my Schiit, I couldn't feel any. Is it normal for Amps or DAC? Thanks for advise.