These are very good sounding iems for the price, however they need a good source! Using my external sound card as an amp (phone headphone out into pc mic in, mic set to 'listen'), the bass became present and the sound became less congested. Straight out of my s7 without an amp, they sounded anemic in the bass and the mid/highs sounded a bit muddy (relatively of course). I will be purchasing a fiio x1ii for on the go listening.