Massdrop: Burson Audio Soloist SL Headphone Amp as low as $530

The Burson Audio Soloist SL Headphone Amp is now on offer at members-only Massdrop, and it could go as low as $520 plus $10~ flat shipping if enough people commit to buying it. It has seven days from blog-posting date to fully unlocked. It only needs six commits for that.