March 31, 2014
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Arriving today from Switzerland, the €36 (delivered) HiFiBerry is a “high-resolution digital-to-analog converter for the Raspberry Pi …with a Dedicated 192kHz/24bit high-quality Burr-Brown DAC for best sound quality.” The daughter-board plugs directly onto the RPi’s onboard connector P5, but does require you to solder an 8-pin header to the RPi in order to do so. You’ll also need to solder the output(s) you want on the HiFiBerry as well. Easy enough, I had it connected in a few minutes, and did a quick check to see if the RPi recognized it, then went to the piCorePlayer web interface to configure it to send sound through the HiFiBerry.
card 1: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 
How does it sound? Fantastic, very clean and detailed, in a word, audiophile grade. The key is Inter-IC Sound or I2S. You can read all about it here but it’s a short, isolated path for PCM data, with extremely low jitter. Which is a great thing, because both analog out and USB audio on the RPi weren’t optimal for quality sound. No noticeable noise floor (as I’m running the TA2024 without a volume pot), it’s a dead silent performer (which is a great thing). Cheers to the RPi people for making I2S available on the Pi, and to the HiFiBerry folks for an affordable, high quality product.