Audio science review Topping A90 Discrete balanced pre/ head amplifier
This is a review and detailed measurements of the new Topping A90 Discrete balanced preamplifier and headphone amplifier. Announcement was supposed to be a few hours from now but one of the distributor already released it so here we go. As you can tell, there is a new design in the form of those pin-hole LEDs which I find quite elegant. Inside there is stepped relay for volume control. Of course as the name indicates, this design uses discrete transistors rather...