Product page here: https://www.minidsp.com/products/plate-amplifiers/il-dsp-headphone-amp So it's a small inline USB headphone DAC/amp that has digital parametric EQ built in. This seems like it could be a good solution for people who want to EQ their headphones without having to deal with bulky electronics such as a regular miniDSP unit and separate amp or to obtain obscure custom stuff such as the "Kameleon" headphone amp. I would like something like this, but the power rating seems to an issue. I would want this mainly to EQ my HD650 or HD58X to flatten and extend the bass response mainly. But the power rating is 30mW per channel at 32 ohms and 1 kHz and is described as "ample for IEMs and most portable headphones". So that's probably inadequate to drive HD650's, right? I wonder how the power output of that thing compares to the headphone output of my late 2013 Macbook Pro Retina 13. I find the headphone amp adequate to power the Senn's whereas the headphone jack on my prior 2008 iMac wasn't. But I can't seem to find specs for the Macbook's headphone amp.