550 GaNFets – AGD's Solo [$23.5K/pr] packs 550 watts into 4Ω (300/8) and 60A peak output current to push the envelope of Alberto Guerra's Vivace, Duet et al precursors using proprietary class D output stages and here a linear 700VA not switching power supply. That fronts an 800kHz-switching power module. The standard oak side panels can be ordered in varying veneers or custom colors and the metal chassis comes in black or silver. Inputs are on RCA or XLR selectable by rear toggle and outputs are WBT copper. There's also a SpeakOn terminal for pro-terminated speaker cable.