Right when I thought my gr07's couldn't get any better. This little amp brought my listening experience to a whole new level. Before with just the j3 and the gr07, the sound could get congested at times with not enough breathing space, but with this amp, it opened things up, it allowed everything to flow naturally. This amp is also super transparent (with the opa209 op amp) it shows you everything cleanly and effortlessly. If you haven't already gotten a portable amp for your dap GET ONE NOW and thank me later. Also, this amp works wonderfully for iems, there is absolutely NO noise or hiss at all.

Its hard to find a headphone that can match this headphones performance at a mere $140. I really can't complain at this price, but if I am to find any fault in it, it is its mids. The mids are not bad by any means but are ever so slightly recessed and sound a bit thin to my ears. Wonderful build quality, you can abuse them, but I dont. Nice long, sturdy, and thick cable. These headphones will clamp very tight when you first get them, but that is very easily fixed. All you have to do is stretch them over a tissue box as you burn them in and viola! Can't beat it for the price. If you want an IEM that is on par with these for about the same price get the Vsonic GR07's, they are like the m50s but with better mids.

just wonderful little iems. wish the isolation was a little better, not bad though, just nitpicking. The microphonics are unacceptable, just a light tap on the cable and i can hear it, annoying as crap, but definitely not a deal breaker.