I used to have a 850. Used it direct to a BAT VK200 and then to a BAT vk60. Later on, I added a BAT vk50se. Here is my experience, on a dollar basis, the Wadia is very very good. Especially at higher volume levels. You do loose resolution when the volume control is 75 or lower, you really start to notice it below 50. However, without a top notch preamp to directly compare it to...you won't miss much.
Also, I thought the preamp helps in dynamics and soundstage. That's my 2 cents...
Also, I thought the preamp helps in dynamics and soundstage. That's my 2 cents...