I did hear the D90 MQA and I wasn't as impressed by it's filter implementation honestly, SU-9 had more apparent subtleties when swapping between filters VS D90
D90 also had that some what aggressive dry presentation but on an AKM chip which felt off? Still the Pre-Amp function of D90 was better imo as SU-9 sit at like what 4+V on the XLR? Which isn't ideal as an even 4V is standard is it not
Either way if you didn't need and want the Digital Pre-Amp function I feel SU-9 would be better. But to use AS a digital Pre-Amp D90 would be better imo
I have two questions:
1. About the Topping D90 pre-amp functionality, I'm a confused about this since I'm a newbie in this area. A90 is also having pre-amp functionality, right? If connecting monitors (XLR) I will do this from the amp, not from the DAC or I could do either? Please enlighten me.

2. This reviewer (for SMSL SU-9) is reporting coil while (second page in the review "Issues" section)? Is this something you noticed?
https://theheadphonelist.com/smsl-su-9-review-epiphany/
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