Topping A90

@soix I am using a Tascam headphones I believe is the TH-200x something like that.

@soix Thanks for the response. That is a good review on both models. The A90 that I am planning on getting is a used but in very mint condition unit. According to the seller, the unit has about 100 hours of playing time just enough of break in time to justify it sound. 

Will be using mainly as a headphone amp as right now I have a Vali 2 which I think sound good.

@soix Thanks! I believe the A90 is similar to the A90D in that it has NFCA module for the A90 which you can say space saving where the A90D is NFCA but in discrete design. 

I have been using the A90 extensively and all can say is WOW. As a headphone amp I am impressed. It took my TASCAM headphones to whole new level. I still have not used it as a preamp but will soon be the next test. Will see how it goes against my Rotel RC-995.