The price of the D90 is okay. I was just trying to justify the cost of the upgrade that's all. I'm sure the gear will last for a while so it's definitely not something I'd be upgrading every year :-)
I see the SU-9 is definitely lower priced than the D90.
Hello,
I got into the world of AMPs, DACs and Headphones very recently. I use a Hifiman Arya with a Schiit Modi (the latest version - connected via USB) and Topping A90 (balanced out). I know, it's not the D90 :). I'm still learning about all the tech. So apologies if this is a silly question...