To measure the Soulution 710, I used Stereophile's loan sample of the top-of-the-line Audio Precision SYS2722 system (see the January 2008 "As We See It" and www.ap.com). I ran the 710 at one-third power into 8 ohms for an hour, which maximally stresses a class-A/B amplifier's heatsinking. At the end of this preconditioning period the amplifier's top panel was only slightly warm, at 90°F (32.2°C).
The voltage gain into 8 ohms was 25.9dB from both the balanced and unbalanced inputs, and both inputs preserved absolute polarity (ie, were non-inverting). The…