MEASUREMENTS

I tested the Cambridge Audio CXA81 with my Audio Precision SYS2722 system (see the January 2008 “As We See It”¹). I first preconditioned the amplifier by following the CEA’s recommendation of operating it at one-eighth the specified power into 8 ohms for 30 minutes. At the end of that time, the top panel was warm, at 98°F (36.7°C), with the grille over the heatsinks and transformer hotter, at 133.1°F (56.2°C). I then performed my usual thermal stress test by running the amplifier at one-third power into 8 ohms for an hour. After 30 minutes, the grille’s temperature in places was 147.1°F (63.4°C). Although this is a little too hot to keep your hand on, the Cambridge amplifier does have enough thermal capacity for its power rating, despite its relatively affordable price.

I looked first at the Cambridge’s performance via its line inputs. As I often find with European amplifiers, the balanced