Professional music lovers will be attracted to this headphone because it raises the benchmark that all other in-ear headsets are judged upon, even our TFTA-2100-2V1S. The metal housing relays an honesty not heard before with any in-ear headphones. The superior accuracy and ultra clear audio reproduction would normally only be associated with reference speakers. One of the great things about TFT Technology is the ability to fine tune the sound. With a frequency range that has been tweaked for a sub-bass bias, lower than any other comparable headset on sale today. This is achievable without sacrificing the clarity of the high end and warmth of the mid range frequencies. The tight fitting bud automatically creates noise isolation and extraneous noise is all but eliminated. This model is ideal for music where sub-bass plays an important part in the overall sound requirement. Only one word can describe these earphones. Awesome!