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I mention this recording in my review of the Lansche 5.1 speaker in the July 2011 issue. The wide-bandwidth spikes in the RH spectrogram are triangles, but the horizontal lines in the same graph are spurious ultrasonic tones that shouldn't be there.
Ultrasonic tones in the Fidelio New World Symphony
By John Atkinson Posted: Jun 28, 2012
Filed Under: Computer Audio