Classé Omega power amplifier Measurements 2
Fig.4 Classé Omega, THD+noise vs frequency at (from top to bottom at 10kHz): 4W into 2 ohms, 2W into 4 ohms, unbalanced, balanced; 1W into 8 ohms, unbalanced, balanced; and 2.83V into simulated loudspeaker load.
Fig.5 Classé Omega, 1kHz waveform at 50W into 4 ohms (top), distortion and noise waveform with fundamental notched out (bottom, not to scale).
Fig.6 shows the output spectrum of a 50Hz input at 300W into 8 ohms. All distortion artifacts are extremely low—well under -80dB (or about 0.01% THD+noise), with the third harmonic again the highest in level. Fig.7 shows a similar spectral plot, this one the result of a combined 19+20kHz signal. The distortion here indicates the sum and difference tones created by the amplifier with these frequencies at the input; or, in other words, the intermodulation between these two tones. It, too, is very low in level.
Fig.6 Classé Omega, spectrum of 50Hz sinewave, DC-1kHz, at 300W into 8 ohms (linear frequency scale).
Fig.7 Classé Omega, HF intermodulation spectrum, DC-22kHz, 19+20kHz at 223W into 8 ohms (linear frequency scale).