Topping A70 Pro Headphone Listening Tests I started testing my with everyday, low impedance and difficult to drive Dan Clark Stealth headphone. Even in low gain the A70 Pro drove these to almost ear bleeding levels and superb dynamics. Switching to high gains provided essentially infinite headroom and extra volume. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.