First post for a long time lurker. After reading what was this entire thread earlier this month, I went out and bought the Emotiva a-100. I was running the Aune T1 (with a Genelex Gold Lion 6922) into a Magni. I used Robrob's suggestion to connect the female end of a headphone extension to the speaker taps (red wire to left positive, white wire to right positive and remaining wire to one of the negatives using banana plugs). Difference is huge. My HE-500s now sing compared with the old set-up. I do get a somewhat annoying hum (that I didn't get with the old set-up) during quiet passages in the music. I also get this hum with my Dragonfly DAC, so I don't think it is just the Aune.
I use JRiver 19 and find that system volume around 75% works best with the Emotiva volume.
Anyway, many thanks to Malveaux, Robrob and others for their helpful contributions to this thread. Any suggestions to get rid of the hum without hurting the SQ are appreciated. I can live with it, but, heck, I'd rather have my cake and eat it too.
Toshiba w/JRiver19 > Ifi USB Power > Aune T1 > Emotiva a100 > HE- 500