I used my Tascam 122 mkII for the readings. I verified that the Tascam performed well on the loopback calibration first, though. I didn't include the calibration in the reading though, so it isn't perfect.
I hooked up my laptop with an HDMI cable to the onkyo and used java mode in REW to create the output. The speakers were unhooked the while testing the preamp out. The left ot right preamp out was then routed into the Tascam.
I wanted HDMI output in the loop because that is the way I use the receiver. I do plan on testing the receiver more thoroughly later today.