Yeah, I think this amp could make quite a splash, if it sounds anywhere near as good as the designer has made it out to be. 22 folks are going in on the initial GB, so that's promising.
Ike1985, It looks like your IEMs are 16 ohms. I *think* that this amp will give decent bass with a headphone impedance that low, but it may be less sub bass than you are used to. X originally designed it to match his 250 ohm Beyerdynamic DT880s, and then he modified the deisign to pair well with most over-ear headphones. Using the 390 uF output capacitors X is now recommending for the build, bass response will be essentially be very flat down to 20 Hz with any headphone of 50 Ohms or more. With your IEM's there will probably be a little bit of low-end roll-off due to not quite meeting NvAvGuy's famous "1/8 rule" for impedance matching. There is a way to predict the bass roll-off, which I just learned how to use! Oh boy, lets do some math!
I learned this from DIYA guru AndrewT, who posted this prediction for the Wintergreen amp with another user's 70 ohm cans, along with his formula here:
http://www.diyaudio.com/forums/group-buys/302859-xrk971-pocket-class-headamp-gb-3.html
Quote:
"It's a passive single pole filter. Calculate the F-3dB
It will have virtually no roll off @ 60Hz and probably no more than about -0.5dB @ 20Hz
F-3dB = 1 / 2PiRC = ~6Hz "
R is the headphone impedance in Ohms and C is the capacitor value in Farads (which is 0.00039390F aka 390uF in this amp).
So for your 16 ohm IEMs...
F-3dB = 1 / 2Pi(16 ohms)(0.00039F) = ~26 Hz
If you'd rather cheat, here is an online calculator that does it for you...
http://learningaboutelectronics.com/Articles/Cut-off-frequency-calculator.php
-3dB at 26 Hz would be subtle but possibly audible, especially in the sub bass, at least. Do you have any other cans to listen with? I also may inquire at DIYA about using a larger output cap to pair better with sensitive headphones, although I'm not sure how big a cap will fit or whether if it may have any effect on sound quality in other ways.
The ALO CDM looks insanely nice...did you part ways with yours? How hot did that thing get?