SNAMM '18 - Square Amps The Doyle Combo Demo Shawn HammondJuly 8, 2018VideoAustin's builder of one-off amps shows off his lone standard model—a Champ-style 1x10 with a little extra gain and a transformative back-panel presence control.whats-newvideostube-combosnamm-2018gear-show-demosquare-ampstube-headspecial-featured-storiesampsgearGearAmpsVideosNAMMReviews