Boss is an DAC with a difference: it avoids jitter using a technique I have not seen before in a Raspberry Pi product.
Unlike the same firm’s Kali product which scrubs jitter from the Raspberry Pi I2S audio signal by re-clocking (using an FPGA, amonst other chips), Boss generates a clean local clock and injects in into Raspberry Pi’s I2S interface for it to clock audio data out on – at least, that is how I understand it.
I am not one for audio woo. All I can say is that the music that came out of a system with Kali was astoundingly clear and very ‘stereo’ sounding – however, the available software was a bit buggy at the time – hopefully that is now sorted – my system ceased to function for unexplained reasons before I could try later software versions.
Anyway, I am really looking forward to trying Boss with Raspberry Pi.
Boss at a glance
- 384 kHz/32bit PCM5122 DAC
- 2 x RCA (left right) output, and header for stacking Allo Volt power amp
- HAT size (67.4 x 65 x 22.2mm, 28g)
- 112dB SNR
- -1dBFS –87dB THD+N
- 2.1Vrms full scale out
- 112dB dynamic range
- 8-384kHz sampling
- Ultra-low-noise voltage regulators and low-pass filtering
- 66.27uVrms noise level:
- On-board EEPROM for automatic configuration (not sure if this is filled yet)
- Frequency auto-switched according to the input I2S
- 45.1584MHz low phase noise low jitter NDK crystal master oscillator
- 49.1520MHz low phase noise low jitter NDK crystal master oscillator