I'm actually working on a review for the iCan (well, all of iFi's products. It's taking a while. I have 6 pages typed up, about 3 for the iCan alone). I don't have experience with the Hifimans (Hifimen?) with the iCan (I have tried the HE500, but that was way before I had possession of the iCan, so I can only make guesses), but I can say this: you'll probably have enough volume for either headphone, but they'll probably sound underpowered. Even my K702 sounds underpowered from the iCan. It's an upgrade from the Objective2, but it's more of a sound signature change than a step up. There's more detail and slightly more power, but when I use the iCan, the only thing I really notice different from the O2 is that there's noticeably less glare.
When looking at an amp, look at output power. 400mW isn't enough for neither my K702 nor my T50RP, so I'm guessing it won't be enough for the more power hungry HE500 and HE-5LE.
So when you say enough volume you mean that It would be loud enough but not strong enough to bring out its dynamics? Also would you say that the k702 and the t50rp are harder to drive then the hd650?
I was going for the iCan over the o2 because of the bass boost, halo graphics, and (from what I perceived in reviews) more power. But you are saying not enough to make a big difference.
Well it looks like the only two things close to my budget if I purchased the he-5le would be the Hifiman ef-5 or the Schiit lyr.
The Schiit lyr plus the he-5LE is a hard stretch. But there is saving for what you want rather than being anxious and settling. I am getting tired of trying different headphones for the sound I want. Instead of buying a headphone to hear details/review mixes and another for immersive music listening I would rather combine both. Hence he-5LE instead of hd650 and q701.
Edited by grizzlybeast - 6/4/13 at 9:33pm