ALLO BOSS V1.2 DAC PCM5122 32Bit / 384kHz with 2 clocks Master Clock I2S

ALLO BOSS DAC PCM5122 32Bit / 384kHz with 2 clocks Master Clock I2S
The excellent Allo Boss DAC Converter comes back in a revised V1.2 version for even more impressive audio performance.

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Shipping date: 22-08-2019.

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Allo Boss DAC V1.2

DAC PCM5122 32bit 384kHz 2x i2S Masterclock

allo boss dac v1.2

Allo's excellent DAC BOSS comes back in a V1.2 release featuring high-quality components, USB Type-C power, and revised and revised design for increased audio performance.

An effective converter

The Boss DAC is a HAT format converter for Raspberry Pi based on a PCM5122 chip capable of decoding signals up to 32bit 384kHz. Its technologies are reminiscent of those of a Allo Kali Reclocker, combined in a compact and powerful 32bit DAC.

New in this version V1.2

Allo offers in the new version of its converter Allo DAC significant improvements. Thus, the clocks have been changed to last generation ultra-low phase NDK oscillators for a greatly reduced jitter.

The module now also offers a USB Type C connector to power it independently in 5V 3A. This of course remains optional and the Boss DAC can still be powered via the Raspberry Pi.

The design has also been revised to propose a more successful and optimized scheme. Finally, note the presence of new quality analog capacitors on the analog section of the module.

High-end digital processing in I2S format

Clocks generated by the Raspberry Pi CPU are not able to provide an accurate 44.1kHz frequency, which can cause problems with audio files sampled from 44.1kHz to 384kHz and resulting in a jitter that is far too high.

The Boss DAC generates its own Masterclock clock and recovers the entire DATA digital signal, ensuring very low noise drift. To do this, simply switch to I2S master mode on your dedicated software player, so that the Raspberry Pi no longer sends clock but only the data to the DAC.

The analog stage is designed to offer the least amount of passive components and uses film rather than ceramic filter capacitors for lower distortion.

LDO triple regulator with very low drift

The DAC Boss offers a unique design. It does in effect a separation of voltages on 3 channels via the use of 3 filters by shielded self and capacitors.

  • A channel for the digital floor
  • A second for the analog stereo stage
  • A third for clocks.

The filtered signal is then recovered and filtered again by regulators (LDO) to obtain an ever lower noise. Note that Allo chooses to integrate among the best LDO regulators (Linear LT3042) market as well as high-end NDK clocks, similar to the recognized Crystek.

Finally, Allo also incorporates a super double capacitor acting as a current reservoir, avoiding the effects of pumping during high dynamic demands of the audio message.

All in all, the Allo Boss DAC, which is more V1.2 version is probably one of the best implementation of the DAC PCM5122 available on the market, correcting the problems of native clock Raspberry Pi and THD electrical pollution.

Compatibility: The Boss DAC is compatible only with the Raspberry Pi, the Allo Isolator module and the Allo Relay Attenuator module. Warning: it will not work with the SBC Allo Sparki and the Allo Kali Reclocker.

As stated previously, the Allo Boss DAC in version V1.2 can be powered independently. For this purpose it is necessary to remove the jumper from the module and to buy separately an adapter Jack DC 5.5 / 2.5mm female to USB Type-C male.

Allo Boss DAC V1 Test by John Darko

test allo boss dac john darko


                

Technical characteristics

Specifications
DACPCM5122
Sampling rateUp to 32bit 384kHz
SBC CompatibilityRaspberry Pi 2/3 only
OS CompatibilityOSMC
Max2Play
RuneAudio
Volumio
Moode
PiCorePlayer
PiMusicBox
OpenElec
Roon Ready
Latest generation ULTRA low phase noise NDK oscillators (SDA series)-
Integrated EEPROM for automatic configuration (with write-protection)-
Audio outputRCA
Header for Allo Volt Amp
GPIO connector-
FormatHAT size
Power supplyUSB Type-C 5V 3A or via Raspberry Pi
boss dac gpio et volt header
 
Data sheet
InputI2S
Components / ChipPCM5122
Channel2 channels (Stereo)
 
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Average votes
5.0 / 5
7 reviews
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Note :
 5/5
Date :
Pace, rhythm and timing are top
I'm a huge fan of the Allo Boss Dac. I like his musicality. Pace, rhythm and timing are top. I have tried different power supplies, LPS,Ifi etc. I became best results with two supplies. Pi and Boss separate powered. Now I use a Allo Shanti and it's the best i tried until now. The music becomes more natural, less grainy, less sharpness. And this without loosing his musicality. I detected only benefits and no disadvantage.
One power supply and you are done. The Allo Shanti is imho a must have, if you like the Boss dac.
 (0)
 (0)
This review has been posted for ALLO BOSS V1.2 DAC PCM5122 32Bit / 384kHz with 2 clocks Master Clock I2S
Note :
 5/5
Date :
Enfin sur mon système audio
C'est propre ! Connectée au raspberry puis ampli proton et enceinte linn index, mon système me donne à nouveau entière satisfaction. Ma platine CD Arcam Alpha plus m'ayant lachée après 25 de bons et loyaux services, il fallait que je puisse à nouveau écouter de la musique et provenant de toutes sources. Une fois volumio paramétré j'ai accès à mon nas, youtube etc... C'est le pied. Merci Audiophonics pour votre site qui propose un large choix avec des avis clients très éclairant. Pas comme le mien ;o)
 (0)
 (0)
This review has been posted for ALLO BOSS V1.2 DAC PCM5122 32Bit / 384kHz with 2 clocks Master Clock I2S
Note :
 5/5
Date :
excellent !
Le rapport Q/P de cette carte est excellent. ça fait plusieurs fois que je m'en sers (chez moi, mais aussi pour des amis), et avec quelques modifications (je remplace le circuit RC de sortie), les résultats rivalisent avec bien d'autres systèmes (serveur/streamer ou lecteur de CD) qui coûtent plusieurs milliers d'€.
J'ai essayé plusieurs fois d'autres cartes à base de puce ESS, et ces dernières ont été à chaque fois beaucoup moins appréciées : beaucoup moins de matière sonore, sensation analogique complètement absente, que de l'acide surdéfinition un peu à la mode de nos jours, me semble-t-il, ce qui est bien dommage.
 (0)
 (0)
This review has been posted for ALLO BOSS V1.2 DAC PCM5122 32Bit / 384kHz with 2 clocks Master Clock I2S
Note :
 5/5
Date :
Produit de qualité
Le Boss V1.2 est une solution DAC plug and play, au rapport qualité prix indiscutable !
Je l'utilise avec Volumio 2, et je suis entièrement satisfait de la qualité d'écoute.
Il manquerait une solution "Allo ADC + RIAA" pour RPI et ce serait un système modulaire au top !

En tout cas, c'est une chouette solution de streaming audio compacte et efficace.
 (1)
 (0)
This review has been posted for ALLO BOSS V1.2 DAC PCM5122 32Bit / 384kHz with 2 clocks Master Clock I2S
Note :
 5/5
Date :
Un très bon DAC
En remplacement de mon vieux Dac Magic le Allo boss fait son travail plutôt bien. Installé sur un Raspberry PI 3 avec VOLUMIO les master studio restituent une excellente sonorité. Le rapport qualité / prix est au rendez-vous, la compacité aussi. Situation d'écoute : Ampli NAD 316BEE enceintes DALI 6006.
 (0)
 (0)
This review has been posted for ALLO BOSS V1.2 DAC PCM5122 32Bit / 384kHz with 2 clocks Master Clock I2S
 
ALLO BOSS V1.2 DAC PCM5122 32Bit / 384kHz with 2 clocks Master Clock I2S
The excellent Allo Boss DAC Converter comes back in a revised V1.2 version for even more impressive audio performance.

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