I find none of those deficiencies in my 4520. I am quite pleased with it as it sounds very neutral. Don't let what you read in those audiophilia rags determine what you hear. What I compare it to is my HD600 headphones with a Asus Essence STX headphone amp. They are very similar. Ooomph usually comes from an exagerated mid bass, get some speakers with such characteristics if that's what you want or use an equalizer.