Perfectwave directstream mk1 dac - matrix x-spdif 2 using external ps?

i’ve been using my matrix x-spdif 2 to connect my pc usb to matrix and matrix i2s to the dac, so the matrix has been running off the usb bus with no external power.
i bought an ifi ipopwerx 9v and plugged it into the matrix. no idea if it’s actually using the ifi or not. if i unplug the usb cable from the matrix with the ifi plugged into the matrix, the matrix led goes off. so i’m suspecting that the ifi isn’t providing any power? anyway to check this for sure?

Ended up returning the ifi power supply. I’m not sure it is was providing power or not, but I couldn’t tell the difference at all listening to music with vs without it.