ALLO Boss DAC compatible with Raspberry Pi, 67,26 €

Description
Reviews

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..."

Plus More >

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.

Features

HAT Size Not HAT Compliant

For RPi
BOSS is a Master DAC (Master DACs are compatible only with RPI)
Compatible with RPI2 and RPI3
Compatible with OSMC / Max2Play / RuneAudio / Volumio / Moode / PiCorePlayer / PiMusicBox / OpenELEC and others + Roon Ready
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

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

Support & Downloads

If you planning to buy BOSS DAC, the DAC's out put is RCA ... the amp's RCA in will be wired to BOSS DAC RCA out thats all AMP should support RCA from BOSS DAC

BOSS is a DAC ,if you wanted to play without AMP, you can use RCA to headphone cable and play song via head phone.

AMP your speakers will be wired ...there are two kind of speaker system ,active and passive speakers
Active speakers, on the other hand, have a built-in amplifier and are fed by a low-level (line-level) signal passed along an interconnect cable originating at your preamplifier or controller. Because the amplifier is an active electronic device, it needs power, and so you have to put any active speakers near a power outlet.

BOSS DAC have only RCA as output, but ALLO have a have own AMP solutions (VOLT+ With Stepped Attenuator).

An RCA connector, sometimes called a phono connector or Cinch connector, is a type of electrical connector commonly used to carry audio and video signals. The connectors are also sometimes casually referred to as A/V jacks.