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140pro - comparing input SoundQuality
Tried to compare SQ of USB,SPDIF and AIR (Roon from NAS) inputs of my 140pro. To ensure that all inputs had the same volume level, I measured the sound pressure with each input (same pink noise-track from the different input sources, source level 100%, Devialet-Volume at -30dB) which resulted in my Living Room in 59dB SPL. 

I found that USB and SPDIF gave the identical SPL and AIR was 0.6 dB less. 

Has anyone made similar experience, that volume level of AIR is less than other inputs ?

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