Boss DAC


$59.00

Warranty
1 Year

IN EUROPE? CLICK HERE

Discounted Pricing
2-4 Units: $55.00/unit
5 Units: $52.00/unit

 

Top Customer Reviews

Dimdim's Blog
"... regarding value-for-money, I think that the Boss DAC claims the priz."

TheArtofSound.net
"The BOSS is like no other imo. It's clean and tuneful signature brings it out to be a more sophisticated little number..."

DiyAudio.com
"We were and are very impressed by the Boss. It is amazing that it is possible to get such beautiful sound for 70 euros!"

RoonLabs.com
"First of all, it has such a deep, deep, low, juicy bass flowing out and projects powerful sound stage!"

RoonLabs.com
"Boss is by far the best Texas Instruments PCM5122 chip based DAC in the market, based on unique technological developments that Allo has put in..."


 

We all live in a society obsessed by brand names and the latest gadget. Sometimes with reason sometimes with none.

The RPI has one major problem with audio. The clocks coming from CPU can only output one frequency clock perfect (very close), resulting in major problems with audio files sampled at 44Khz (and multiple). Too much jitter on i2s clocks. So we invented the Kali but there is a second way.

Enter the master mode for i2s. Instead of the RPI giving the clock on the line, the DAC itself sends the clocks and RPI sends the data (file to be played). Since we used 2 clocks the problem above disappears. Ours is not the first master DAC on the market, there are others... read on.

Our BOSS DAC is unique, because of the way we have implemented the design. First we separate the power on 3 channels and filter it: one for the digital side, the second for analog and third for the clocks themselves. Then we take the filtered power and use a second filter (LDOs) to further quiet the noise. Note that we use some of the best LDOs on the market (LT3042 from Linear). In addition, we use Japanese oscillators from NDK for a very low jitter clock - almost as good as famous Crystek.

Finally, on the analog stage we are using a film capacitor (not ceramic) for a quiet DC to feed the TI IC (ceramic exhibit some piezo distortion, not what you want in analog stage). Not happy with this, we have added a supercapacitor for an extra kick when analog stage is asking (like deep bass).

What we have achieved, in our opinion, is the best analog implementation of the PCM5122 on the market, while at same time correcting the clock problem from RPI.

Yes we live in a society obsessed with the latest gadgets. The BOSS however, is a very solid implementation of the PCM IC that will give you the greatest bang for your buck. It will sound great no matter what you throw at it - this was our goal and promise to you.

Measured Jitter

Features

HAT Size Not HAT Compliant
  • BOSS is a Master DAC (Master DACs are compatible only with RPI)
  • Compatible with RPI2 and RPI3
  • Dedicated 384 kHz/32bit high-quality DAC PCM5122 for best sound quality
  • Audio output connectors: 2 x RCA (Left & Right ) & Allo Volt Amp header
  • HAT size
  • DAC SNR is 112dB
  • DAC THD+N @ -1dBFS are –87dB
  • Full Scale Output of DAC is 2.1Vrms
  • Dynamic Range of DAC is 112dB
  • Sampling Frequency ranges from 8 kHz to 384 kHz
  • Ultra-low-noise voltage regulators & LPF for optimal audio performance
  • Noise level: 66.27uVrms
  • Integrated EEPROM for automatic configuration (with write-protection)
  • Automatically switching frequencies according to the input I2S signals
  • Dual low jitter NDK crystal oscillators for Master Clock generation
  • With 45.1584/49.1520 MHz Ultra Low Phase Noise Oscillators

Boss DAC Components

(click to enlarge)

 

Components

 

 

 

Bottom View

 

BOSS Hi-Fi DAC BLOCK DIAGRAM

 

BOSS Hi-Fi DAC BLOCK DIAGRAM

Software Info: Add "dtoverlay=allo-boss-pcm512x-audio" to config.txt

Technical Specifications

 

BOSS Header PIN-Out Details

RPI

PIN

PIN

RPI

NC

1

2

DC +5V

SDA1-I2C

3

4

DC +5V

SCL1-I2C

5

6

GND

GPIO4

7

8

UART_TX

GND

9

10

UART_RX

GPIO17

11

12

I2S_BCLK

GPIO27

13

14

GND

GPIO22

15

16

GPIO23

NC

17

18

GPIO24

SPI_MOSI

19

20

GND

SPI_MISO

21

22

GPIO25

SPI_CLK

23

24

GPIO8

GND

25

26

GPIO7

ID_SD

27

28

ID_SC

GPIO5

29

30

GND

GPIO6/DMUTE

31

32

GPIO12

GPIO13

33

34

GND

I2S_LRCLK

35

36

GPIO16

GPIO26

37

38

I2S_DIN

GND

39

40

I2S_DOUT

 

** Highlighted signals are used by BOSS board

 

BOSS J19 PIN OUT DETAILS ( Allo VOLT Header)

RPI

PIN 

PIN

RPI

5V

1

2

5V

NC

3

4

NC

SDA1-I2C

5

6

GPIO4

SCL1-I2C

7

8

GPIO17

NC

9

10

GPIO27

NC

11

12

GPIO24

GPIO23/ SDZ_AMP

13

14

GPIO22 / MUTE_AMP

GND

15

16

GND

 

BOSS J20 PIN OUT DETAILS (Allo VOLT Header)

SIGNAL

PIN 

PIN

SIGNAL

GND

1

2

GND

AUDIO RIGHT

3

4

AUDIO LEFT

AUDIO RIGHT

5

6

AUDIO LEFT

GND

7

8

GND

 

Operating Temperature 0C to 70C
Board Size LWH = 67.4mm * 65mm * 22.2mm
Board Weight 28g
Vana Player
Vana Player
Kali + Piano 2.1 + Volt
Kali + Piano 2.1 + Volt
Kali + Piano 2.1
Kali + Piano 2.1

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