These earphones are as powerful as any other on the market. However, the key thing about TFT Accoustic earphones (the whole range) is their ability to play loud music without distortion. Due to the use of Thin Film Technology, the earphones have a larger sound spectrum and therefore you can hear sounds in music that you wouldn't hear using other earphones, even ones that are much more expensive. We have done performance tests against other leading brands including Sennheiser, Ultimate Ears, Monster, Apple, Sony, Audio Technica and Etymotic and in all cases, the TFT Accoustics earphones either out-perform or match these much more expensive models. The results of these tests can be seen on the TFT Accoustics website www.TFTaccoustics.com.