sorry to hear that someone's amp has problem. try it with mine w1000, it drives it easily, it is been burned more than 70 hours so far. the sound is getting better

i have my for about a week, i use the Ibasso D2 as the DAC and use the line out to RAC to connect to the Bravo amp then drive my K701, it is getting better and better volume setting for the K701 is about 10-11 o'clock, the sound is full of detail, i finally get the low(bass) out of the K701...