Audiophilepure

https://www.stereophile.com/content/dynaudio-contour-20-black-edition-loudspeaker

I started my critical listening by playing the diagnostic tracks I created for the various Stereophile Test CDs (footnote 2). The 1/3-octave warble tones were cleanly reproduced down to the 80Hz band. The 63Hz tone was slightly lower in level, the 50Hz and 40Hz tones slightly higher in level. The 32Hz tone was boosted by my room’s lowest-frequency mode. I couldn’t hear the 20Hz tone. The half-step–spaced tonebursts spoke cleanly and evenly from 4kHz down to 32Hz. The lower-frequency tonebursts and warble tones sounded clean, with no “doubling” (second-harmonic distortion), and there was no wind noise from the port. Listening with a stethoscope to the enclosure’s sidewalls while these test tones played, I could hear some resonances in the octave between 250Hz and 500Hz.

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