Classé Omega line-level preamplifier SIDEBAR 3: Measurements part 2
Fig.3 Classé Omega, THD+noise (%) vs frequency at 2.15V (balanced) and 820mV (unbalanced) into 100k ohms.
Fig.4 Classé Omega, distortion (%) vs output voltage into 100k ohms.
The spectrum of the Omega's output, driving a 50Hz sinewave at a very high output level of 10V into 100k ohms is shown in fig.5. The distortion is very low, with no artifacts above -95dB (about 0.002%).
Fig.5 Classé Omega, spectrum of 50Hz sinewave, DC-1kHz, at 10V into 100k ohms (linear frequency scale).
Except for the measured gain—which will be sufficient for most systems but is still less than specified—the measurements taken of the Classé Omega indicate impeccable operation.—Thomas J. Norton