Linn Klimax 500 Solo monoblock power amplifier Measurements part 2
Fig.3 Linn Klimax 500 Solo, THD+noise (%) vs frequency at (from top to bottom at 2kHz): 4W into 2 ohms, 2W into 4 ohms, 1W into 8 ohms, and 2.83V into simulated loudspeaker load (balanced curves are each slightly lower than unbalanced).
The waveform of the distortion at 2W into 4 ohms is shown in fig.4. While there is a clear second-order component, significant amounts of higher-order distortion are visible, though the actual distortion levels are quite low. The distortion waveforms are very similar at 1W into 8 ohms and 4W into 2 ohms (neither shown).
Fig.4 Linn Klimax 500 Solo, 1kHz waveform at 2W into 4 ohms (top), distortion and noise waveform with fundamental notched out (bottom, not to scale).
Fig.5 shows the Klimax's output spectrum at 335W into a 4 ohm load when driven by a 50Hz signal. The distortion products are generally very low: -74.4dB at the third harmonic of 150Hz (about 0.02%), and -89.6dB (just over 0.003%) at the fifth, 250Hz.
Fig.5 Linn Klimax 500 Solo, spectrum of 50Hz sinewave, DC-1kHz, at 335W into 4 ohms (linear frequency scale).