- Written by Ross Jones
- Published on 07 April 2008
As to IMD, it was about the same at the pre-out as at the speaker output, i.e., 0.03%.
THD+N vs. FrequencyÂ remained at acceptable levels from 10 Hz to 20 kHz, at the pre-out and at the speakerÂ output for both 8 ohms and 4 ohms. At 4 ohms, distortion is a bit higher than at 8 ohms, which is to be expected. This is a new test script for the software (SpectraPlus) that we requested to be developed, and the results depend on the quality of the soundcard. The distortion curve here is approaching the limits of the card. Our Audio Precision test instrument is accurate to a much higher level, but we can't ship that around to the various writers.
The measured frequency response was within 3 dB, 20 Hz - 20 kHz. Obviously, there is a built-in steep roll-off above 23 kHz.
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