Crosstalk for the Envy with either type of 300B tubes was about -50 dB (top right corner in the two figures shown below). Solid-state equipment can have crosstalk levels at -120 dB or so. The -50 dB crosstalk level for the Feliks Audio Envy means that a low level of each channel can be heard in the opposite channel. This helps to reduce the “hole in the middle” effect that can plague headphone listening when some of the instruments are only in one channel, like the Art Pepper album that I use in so many of my listening tests. It was recorded at the beginning of the stereo movement in the 1950’s, and recording studios often placed instruments in the left or right channels only.
Audiophilepure 
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