ALLO DIGIONE SIGNATURE digital interface SPDIF Raspberry Pi 3 / 4

Review by The Hans Beekhuyzen Channel

Two insulated PCB

The PCB is now divided into two parts, allowing the circuit more space than the previous version.

Its design is less subject to space limitations and can accommodate compex network and more subtle components than before. Clocks and buffers enjbenefits from better film capacitors.

In addition to this first advantage, the choice of dividing the two PCB is mainly explained by a desire to overcome the technical limitations (power supply management) in a Raspberry Pi .

The lower PCB and has its own standard power input (5V / 2-3A). This power supply is also used to power the PI.

The lower PCB working in duo with the RPI is the "dirty side" which gathers every component that may generate unwanted noise or cause signal degradation.

Naturally, this "dirty" portion is isolated (galvanic insulation) from the rest of the circuit that is dedicated strictly to audio processes.

On the other hand, the upper PCB is the "clean side" which focuses all critical and high sensitivity components. This circuit is isolated from the second PCB and Pi. It can (and must) be powered separately.

If the prospect of a double power supply for one interface can seem restrictive, the return on investment is considerable:
The "clean" power is extremely flexible. Since it only bear sensitive audio components, the technical specifications that it has to meet are less heterogeneous. It is much easier to achieve satisfactory operating conditions with this type of configuration. The circuit will operate without failures with voltages from 5 to 6V as long as it is provided with at least 100mA current. Whether a battery, a linear power supply or even a good switching power supply is up to you.

oscillator ndk ultra low jitter and phase noise

The second , more subtle, benefit is also the most interesting in the context of an audio project.

The 2x PCB / 2x separate power means that any improvement in the "clean" circuit power supply will be an improvement of higher repercutions than with a single-supply scheme.

In other words, the Digione Signature interface will not "waste" the potential of an improved power supply on components that do not specifically need the best power supply there is. Thus it can focus especially on the critical audio components.

The design 2PCB / 2PSU is able to make the most olf any improvement made on the upper floor power supply. Conversely, the digital interface is more likely to "forgive" the user if the power on the "dirty" side is not as good as it could. This asymmetry is very relevant in audio with multi-PSU systems.

Specifications
Type	digital interface
Input	Raspberry Pi GPIO
Output	1x BNC 1x RCA Coaxial
Regulators	10x LDO
Filters	12x LPF
Galvanic isolation	Yes
Cchip	WM8805
Supercapacitor	Yes
Oscillators	NDK
Jitter	400fs
Noise	50UV
Power Supply	+5V (via USB-C)
Driver	Works with any former driver version of DIGIONE
Package	Delivered assembled (2 modules + spacers + screws) 2x female Jack DC 5.5 / 2.5mm to male USB-C adapter

Specifications

Type

digital interface

Input

Raspberry Pi GPIO

Output

1x BNC
1x RCA Coaxial

Regulators

10x LDO

Filters

12x LPF

Galvanic isolation

Yes

Cchip

WM8805

Supercapacitor

Yes

Oscillators

NDK

Jitter

400fs

Noise

50UV

Power Supply

+5V (via USB-C)

Driver

Works with any former driver version of DIGIONE

Package

Delivered assembled (2 modules + spacers + screws)
2x female Jack DC 5.5 / 2.5mm to male USB-C adapter

GPIO Pinout

Input	I2S
Output	Coaxial SPDIF
DAC / ADC Chip	NC
Max sampling rate	192kHz
Interface chip	WM8805

Thank you Audiophonics for offering this product!
I'm really glad I bought the Allo DigiOne Signature!
Paired with a good DAC (I have the Topping E50), the sound is amazing.
Wonderful voices, generally excellent precision. - Fantastic!
I use a very good and very low-noise power supply (Allo Nirvana SMPS) for the streamer and the DAC. I assume the Allo Shanti, for example, could bring further improvements.
The speakers seem to exist even less to me, the spatial image has more depth. Everything seems more realistic. Fantastic even for live recordings.
I also have the predecessor (without signature, unfortunately no longer available). This already has amazing qualities. With signature it is actually even better.
The Allo DigiOne Signature is, in my opinion, a fantastic product and definitely worth every cent!

Thank you Audiophonics for offering this product!

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This review has been posted for ALLO DIGIONE SIGNATURE digital interface SPDIF Raspberry Pi 3 / 4

Ensemble très correct pour premier pas dans l'univers du dématérialise. Solution facile à mettre en œuvre. Durant 1 an ma donner pleinement satisfaction.

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This review has been posted for ALLO DIGIONE SIGNATURE digital interface SPDIF Raspberry Pi 3 / 4

Le Digione en mieux
Je possède toujours le Digione dans sa première version, et c'était devenu mon streamer privilégié malgré des soucis assez contraignants (perte du signal vis à vis du DAC, redémarrage nécessaire).
Niveau purement sonore, il fait mieux que mon Bluesound Node.
Pour le remplacer, je me suis décidé à rester chez Allo avec la version Signature de ce dernier, et je ne regrète vraiment pas ce choix !
Sur un bon système, on perçoit de suite une nette différence mais il est conseillé de le laisser jouer 2 à 3 jours minimum avant d'y prêter une oreille attentive à ses qualitées sonores.
Important, il faut soigner l'alimentation pour la partie 'clean' càd celle qui alimente le module Digione et non le Raspberry.
Je l'utilise avec l'alim ifi iPower de 5v qui est certainement un des meilleurs en rapport qualité/prix, et j'ai également pris le pack de batterie prévu (pas encore tester).
Alors comment sonne t-il ?
La scène sonore est élargie, meilleur placement des instruments;
Le son à un côté plus analogique, plus rafiné, les détails sont plus nombreux, la dynamique est bien préservée.
Côté app, je recommande Volumio car il est possible de l'utiliser gratuitement, il est bien stable et peut être piloté à partir d'un navigateur web.
Ceci dit, mon app préféré est Roon, mais il est payant (abonnement annuel ou achat licence à vie). L'ergonomie et les fonctionnalités sont de ce qui se fait de mieux, et il est compatible avec beaucoup de marques différentes.
J'espère que mon avis vous sera pertinent, et merci déjà de m'avoir lu.

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This review has been posted for ALLO DIGIONE SIGNATURE digital interface SPDIF Raspberry Pi 3 / 4

Outstanding for the money
Upgraded from HiFiBerry Digi Pro. The increase in sound quality was simply astounding in every aspect. Power supplies are Raspi 4 official supply in the dirty side and a IFi in the clean side. DAC used is that built into the Marantz 6006 amp.

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This review has been posted for ALLO DIGIONE SIGNATURE digital interface SPDIF Raspberry Pi 3 / 4