[ad_1] In this article we review the $2,100 USD Astell&Kern ACRO CA1000 amplifier.   The Astell&Kern ACRO CA1000 is a $2,1000 USD “Carriable Headphone Amp” that blurs the lines between the functionality and portability of a Digital Audio Player (DAP) and a traditional desktop headphone amplifier. We take this latest category-defying product from South Korea’s…